PET2000-12-074RDK

PET2000-12-074XD BEL | Alldatasheet

Document overview

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Technical content

The PET2000-12-074xD is a 2000 Watt DC to DC power supply that converts -40 to -72 VDC voltage into an i solated main output of +12 VDC for powering intermediate bus architectures (IBA) in high performance and reliability servers, routers, and network switches. The PET2000 -12-074xD utilizes full digital control architecture for greater efficiency, control, and functionality. This power supply meets international safety standards.

• Best-in-class, “Platinum” efficiency
• Wide input voltage range: -40 to -72 VDC
• Always-On 12 V / 2.5 A / 30 W standby output
• Hot-plug capable
• Parallel operation with active current sharing
• Full digital controls for improved performance
• High density design: 42.1 W/in3
• Small form factor: 73.5 x 40.0 x 265 mm
• PMBus® communication interface for control, programming and monitoring
• Status LED with fault signaling
• Networking Switches
• Servers & Routers
• Telecommunications Disclaimer: PMBus is a registered trademark of SMIF, Inc.

2 PET2000-12-074xD

• Default option – no suffix needed.

component stresses, thus providing increased system reliability and very high efficiency. high availability applications. The supply is fan cooled and ideally suited for integration with a matching airflow path. active OR-ing device for maximum reliability. I2C bus. The I2C bus allows full monitoring of the supply, including input and output voltage, current, power, and inside temperatures. power demand and supply temperature and can be overridden through the I2C bus. Figure 1. Block Diagram

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2018 Bel Power Solutions & Protection BCD.00773.0_AE Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely affect long-term reliability and cause permanent damage to the supply. PARAMETER CONDITIONS / DESCRIPTION MIN MAX UNITS Vi max Maximum Input Voltage Continuous -72 VDC General Condition: TA = 0…40 °C (PET2000-12-074RD), TA = 0…55 °C (PET2000-12-074ND), unless otherwise noted. PARAMETER DESCRIPTION / CONDITION MIN NOM MAX UNIT Vi start Minimum Operating Input Voltage Stand-by output available, DSP running -32 VDC Vi nom Nominal Input Voltage -53 VDC Vi Input Voltage Normal operation (from Vi min to Vi max) -40 -72 VDC Ii Input Current Vi > Vi min A Ii pk Inrush Current Limitation From Vi min to Vi max, TA = 25°C, turn on 40 55 A Vi on Turn-On Standby Input Voltage Ramping up -30 VDC Vi on Turn-On Input Voltage Ramping up -41 -42 VDC Vi off Turn-Off Input Voltage Ramping down -38.0 -39.5 VDC η Efficiency Vi = -53 VDC; 20% load 93 % Vi = -53 VDC; 50% load 95 % Vi = -53 VDC; 100% load 93 % Thold_V1 Hold-Up Time V1 167 A on I1, 2.5 A on Vsb with 2,200 µF of Load capacitance 5 6 ms Thold_sb Hold-Up Time Vsb 167 A on I1, 2.5 A on Vsb with 2,200 µF of Load capacitance 12 18 ms

4.1 INPUT FUSE

A fast-acting 80 A input fuse in the negative voltage path inside the power supply protect against severe defects. The fuse is not accessible from the outside and are therefore not serviceable parts.

4.2 INRUSH CURRENT

Internal bulk capacitors will be charged through resistors connected from bulk cap minus pin to the DC rail minus, thus limiting the inrush current. After the inrush phase, NTC resistors are then shorted with MOSFETs connected in parallel. The Inrush control is managed by the digital controller (DSP).

4.3 INPUT UNDER-VOLTAGE

If the value of input DC voltage stays below the input under voltage lockout threshold Vi on, the supply will be inhibited. Once the input voltage returns within the normal operating range, the supply will return to normal operation again. If the input voltage stays below the input undervoltage lockout threshold Vi on, the supply will be inhibited. Once the input voltage retu rns within the normal operating range, the supply will return to normal operation again.

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tech.support@psbel.com General Condition: TA = 0…40 °C (PET2000-12-074RD), TA = 0…55 °C (PET2000-12-074ND), unless otherwise noted. PARAMETER DESCRIPTION / CONDITION MIN NOM MAX UNIT Main Output V1 V1 nom Nominal Output Voltage 0.5 ∙ I1 nom, TA = 25°C

12.0 VDC

V1 set Output Setpoint Accuracy -0.5 +0.5 %V1 nom dV1 tot Total Static Regulation Vi min to Vi max, 0 to 100% I1 nom, TA = 0 to 40°C -5 +5 %V1 nom P1 nom Nominal Output Power 1 Vi min to Vi max, TA = 0 to 55°C (PET2000-12-074ND) Vi min to Vi max,, TA = 0 to 40°C (PET2000-12-074RD) 2000 W I1 nom Output Current Vi min to Vi max,, TA = 0 to 55°C (PET2000-12-074ND) Vi min to Vi max,, TA = 0 to 40°C (PET2000-12-074RD) 0.0 167 ADC I1 peak Peak Output Current Vi min to Vi max, 0.0 175.3 ADC V1 pp Output Ripple Voltage 2 Vi min to Vi max, 0 to 100% I1 nom, Cext ≥ 1 mF/Low ESR 120 mVpp dV1 load Load Regulation Vi nom , 0 to 100% I1 nom -160 mV dV1 line Line Regulation Vi min to Vi max, 0.5 ∙ I1 nom -20 0 20 mV dV1 temp Thermal Drift Vi nom HL, 0.5 ∙ I1 nom -0.5 mV/°C dI1 share Current Sharing Deviation from I1 tot / N, I1 > 10% -4 +4 ADC VISHARE Current Share Bus Voltage I1 peak at 180 A 9.4 VDC dV1 lt Load Transient Response ΔI1 = 50% I1 nom, I1 = 10 … 100% I1 nom, Cext = 0 mF, dI1/dt = 1A/μs, recovery within 1% of V1 nom

0.6 VDC

trec Recovery Time 0.5 1 ms V1 dyn Dynamic Load Regulation ΔI1 = 50% I1 nom, starting anywere from 10% to 60%, Cext = 2 ...30mF, di/dt =1A/µs, 25°C 11.4 12.6 V tV1 on delay Delay time from DC applied V1 in regulation Vi = 0V to Vi min , Vi nom, Vi max 3 sec tV1 rise Output Voltage Rise Time V1 = 10…90% V1 nom, Cext < 10 mF 10 200 ms tV1 ovr sh Output Turn-on Overshoot Vi nom , 0 to 100% I1 nom 13.2 V dV1 sense Remote Sense Compensation for cable drop, 0 to 100% I1 nom 0.25 V CV1 load Capacitive Loading 0 20 mF OVP Over voltage Trip Vi min to Vi max, 13.6 15.0 V Standby Output VSB VSB nom Nominal Output Voltage ISB =1.25A (50% of ISBnom, 25°C, (PET2000-12-074ND)) ISB =1.50A (50% of ISBnom, 25°C, (PET2000-12-074RD)) VSB set Output Setpoint Accuracy -2 +2 %VSBnom dVSB tot Total Regulation Vi min to Vi max, 0 to 100% ISB nom -5 +5 %VSBnom PSB nom Nominal Output Power Vi min to Vi max, TA = 0 to 70°C (PET2000-12-074ND) Vi min to Vi max, TA = 0 to 55°C (PET2000-12-074RD) 30 36 W W PSB peak Peak Output Power Vi min to Vi max (PET2000-12-074ND) Vi min to Vi max (PET2000-12-074RD) 34 40 W W ISB nom Output Current Vi min to Vi max, TA = 0 to 70°C (PET2000-12-074ND) Vi min to Vi max, TA = 0 to 55°C (PET2000-12-074RD) 0 2.5 3.0 ADC ADC ISB peak Peak Output Current Vi min to Vi max (PET2000-12-074ND) Vi min to Vi max (PET2000-12-074RD) 2.85 3.4 3.8 3.5 4.5 ADC ADC VSB pp Output Ripple Voltage 2 Vi min to Vi max, 0 to 100% ISB nom, Cext = 0 mF 150 mVpp Vi min to Vi max, 0 to 100% ISB nom, Cext ≥ 2 mF/Low ESR 120 mVpp dVSB load Load Regulation Vi nom HL, 0 to 100% ISB nom -300 mV dVSB line Line Regulation Vi min to Vi max, ISB nom = 0 A -20 4 20 mV dVSB temp Thermal Drift Vi nom HL, ISB nom = 0 A -0.5 mV/°C dISB share Current Sharing Deviation from ISB tot / N, ISB = 0.5 ∙ ISB nom -1 +1 ADC

1 See also chapter TEMPERATURE AND FAN CONTROL

2 Measured with a 10 µF low ESR capacitor in parallel with a 0.1 µF ceramic capacitor at the point of measurement

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Figure 4. Separated power and signal ground Figure 5. Block diagram with reliable System Earth connection General Condition: TA = 0…40 °C (PET2000-12-074RD), TA = 0…55 °C (PET2000-12-074ND), unless otherwise noted.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2018 Bel Power Solutions & Protection BCD.00773.0_AE The power supply operating parameters can be accessed through I2C interface. For more details refer to chapter I2C / PMBus® COMMUNICATION and document URP.00234 (PET2000-12-074 PMBus® Communication Manual). PARAMETER DESCRIPTION / CONDITION MIN NOM MAX UNIT Vi mon Input Voltage Vi min LL ≤ Vi ≤ Vi max -2 +2 VDC Ii mon Input Current Ii > 5.8 A -10 +10 % Pi mon True Input Power Pi > 250 W -10 +10 % V1 mon V1 Voltage -0.2 +0.2 VDC I1 mon V1 Current I1 > 50A -2 +2 % 5 A < I1 ≤ 50 A -0.5 +0.5 ADC P1 nom V1 Output Power Pi > 1000 W -1 +1 %

50 W < Pi ≤ 1000 W -10 +10 W

VSB mon VSB Voltage -0.2 +0.2 VDC ISB mon VSB Current -0.2 +0.2 ADC TA mon Inlet Temperature TA min ≤ TA ≤ TA max -5 2 +5 °C

8.1 OVERVOLTAGE PROTECTION

The PET2000-12-074xD front-end provides a fixed threshold overvoltage (OV) protection implemented with a HW comparator for both the main and the standby output. Once an OV condition has been triggered on the main output, the supply will shut down and latch the fault condition. The latch can be unlocked by disconnecting the supply from the D C supply or by toggling the PSON_L input. The standby output will continuously try to restart with a 1 s interval after OV condition has occurred.

8.2 UNDERVOLTAGE DETECTION

Both main and standby outputs are monitored. LED and PWOK_H pin signal if the output voltage exceeds ±5% of its nominal voltage. The main output will latch off if the main output voltage V1 falls below 10 V (typically in an overload condition) for more than 55 ms. The latch can be unlocked by disconnecting the supply from the DC supply or by toggling the PSON_L input. If the standby output leaves its regulation bandwidth for more than 2 ms then the main output is disabled to protect the system.

8.3 CURRENT LIMITATION

The main output exhibits a substantially rectangular output characteristic controlled by a software feedback loop. If output current exceeds IV1 OC Fast it will reduce output voltage in order to keep output current at IV1 OC Fast. If the output voltage dro ps below ~10.0 VDC for more than 55 ms, the output will latch off (standby remains on). The latch can be unlocked by disconnecting the supply from the DC mains or by toggling the PSON_L input. The main output current limitation thresholds depend on the actual input applied to the power supply. STANDBY OUTPUT The standby output exhibits a substantially rectangular output characteristic down to 0 V (no hiccup mode / latch off). The current limitation of the standby output is independent of the DC input voltage. Running in current limitation causes the output voltage to fall, this will trigger under voltage protection and disables the main output.

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tech.support@psbel.com PARAMETER DESCRIPTION / CONDITION MIN NOM MAX UNIT PSON_H / HOTSTANDBYEN_H VIL Input Low Level Voltage PSON_L: Main output enabled -0.2 0.8 V HOTSTANDBYEN_H: Hot Standby mode not allowed VIH Input High Level Voltage PSON_L: Main output disabled 2 3.5 V HOTSTANDBYEN_H: Hot Standby mode allowed IIL,H Maximum Input Sink or Source Current VI = -0.2 V to +3.5 V -1 1 mA Rpull up Internal Pull up Resistor to internal 3.3 V 10 kΩ RLOW Maximum external Pull down Resistance to GND to obtain Low Level 1 kΩ RHIGH Minimum external Pull down Resistance to GND to obtain High Level 50 kΩ PWOK_H VOL Output Low Level Voltage V1 or VSB out of regulation, VIsink < 4 mA 0 0.4 V VOH Output High Level Voltage V1 and VSB in regulation, Isource < 0.5 mA 2.4 3.5 V Rpull up Internal Pull up Resistor to internal 3.3 V 1 kΩ IOL Maximum Sink Current VO < 0.4 V 4 mA 10.

10.1 ELECTRICAL CHARACTERISTICS

10.2 SENSE INPUTS

The main output has sense lines implemented to compensate for voltage drop on load wires in both positive and negative path. The maximum allowed voltage drop is 200 mV on the positive rail and 100 mV on the GND rail. With open sense inputs the main output voltage will rise by 270 mV. Therefore, if not used, these inputs should be connected to the power output and GND at the power supply connector. The sense inputs are protected against short circuit. In this case the power supply will shut down.

10.3 CURRENT SHARE

The PET front-ends have an active current share scheme implemented for V1. All the ISHARE current share pins need to be interconnected in order to activate the sharing function. If a supply has an internal fault or is not turned on, it will disconnect its ISHARE pin from the share bus. This will prevent dragging the output down (or up) in such cases. The current share function uses an analog bus to transmit and receive current share information. The controller implements a Master/Slave current share function. The power supply providing the largest current among the group is automatically the Master. The other supplies will operate as Slaves and increase their output current to a value close to the Master by slightl y increasing their output voltage. The voltage increase is limited to +250 mV. The standby output uses a passive current share method (droop output voltage characteristic).

10.4 PSON_L INPUT

The PSON_L is an internally pulled -up (3.3 V) input signal to enable/disable the main o utput V1 of the front -end. With low level input the main output is enabled. This active -low pin is also used to clear any latched fault condition. The PSON_L can be either controlled by an open collector device or by a voltage source.

Figure 6. PSON_L connection

10.5 PWOK_H OUTPUT

regulation. This pin is active-low. Figure 7. PWOK_H connection

10.6 PRESENT_L OUTPUT

into PRESENT_L should not exceed 5mA to guarantee a low level voltage if power supply is seated. Figure 8. PRESENT_L connection

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3 At repeated ON-OFF cycles the start-up times can be increased by 1 s

10.7 SIGNAL TIMING

Figure 9. DC turn-on timing Figure 10. DC short dips Figure 11. DC long dips Figure 12. PSON_L turn-on/off timing

Table 1. LED Status

4 The order of the criteria in the table corresponds to the testing precedence in the controller

10.8 LED INDICATOR

DC input and DC output power presence and warning or fault conditions. Table 1 below lists the different LED status.

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1 Cb = Capacitance of bus line in pF, typically in the range of 10…400 pF

Table 2. I2C / SMBus Specification Figure 14. I2C / SMBus Timing

• The SDA/SCL IOs use 3.3 V logic levels
• External pull-up resistors on SDA/SCL required for correct signal edges
• Full SMBus clock speed of 100 kbps
• Clock stretching limited to 1 ms
• SCL low time-out of >25 ms with recovery within 10 ms
• Recognizes any time Start/Stop bus conditions 3.3/5V Rpull-up TX RX SDA/SCL 3.3V 10kΩ DSP or EEPROM TX_EN

Figure 13. Physical Layer of Communication Interface communication to the unit is possible as long as it is connected to a life VSB output (provided e.g. by the redundant unit). If only V1 is provided, communication is not possible.

leave them open (Logic High). An internal pull up resistor will cause the A1 / A0 pin to be in High Level if left open. A fixed addressing offset exists between the Controller and the EEPROM. 1) The LSB of the address byte is the R/W bit. 2) A2 is used on the standard model only. On special models (e.g. PET2000-12-074ND020) the connector PIN is used for IN_OK functionality. These models have only two addressing pins A0 and A1. A2 is set to 0 inside firmware by default. Table 3. Address and Protocol Encoding Figure 15. SMBALERT_L connection

11.1 SMBALERT_L OUTPUT

The SMBALERT_L signal indicates that the power supply is experiencing a problem that the system agent should investigate. The SMBAlert signal is asserted simultaneously with the LED turning to solid amber or blinking amber.

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11.2 CONTROLLER AND EEPROM ACCESS

and EEPROM which are supplied by internal 3.3 V. The EEPROM provides 256 bytes of user memory. None of the bytes are used for the operation of the power supply. Figure 16. I2C Bus to DSP and EEPROM

11.3 EEPROM PROTOCOL

commands are defined, it is recommended to use the single byte write / read commands. occur after 5ms of the last STOP condition to allow the EEPROM to write the data into its memory. the data byte at the specified location.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2018 Bel Power Solutions & Protection BCD.00773.0_AE

11.4 PMBus® PROTOCOL

The Power Management Bus (PMBus®) is an open standard protocol that defines means of communicating with power conversion and other devices. For more information, please see the System Management Interface Forum web site at: www.powerSIG.org. PMBus® command codes are not register addresses. They describe a specific command to be executed. The PET2000-12-074ND supply supports the following basic command structures:

• Clock stretching limited to 1 ms
• SCL low time-out of >25 ms with recovery within 10 ms
• Recognized any time Start/Stop bus conditions WRITE The write protocol is the SMBus 1.1 Write Byte/Word protocol. Note that the write protocol may end after the command byte or after the first data byte (Byte command) or then after sending 2 data bytes (Word command). In addition, Block write commands are supported with a total maximum length of 255 bytes. See PET2000-12-074NA / PET2000-12-074ND PMBus® Communication Manual URP.00234 for further information. READ The read protocol is the SMBus 1.1 Read Byte/Word protocol. Note that the read protocol may request a single byte or word. In addition, Block read commands are supported with a total maximum length of 255 bytes. See PET2000-12-074NA/ PET2000-12-074ND PMBus® Communication Manual URP.00234 for further information. S Address W A Command A Data Low Byte1) A Data High Byte1) A P 1) Optional S Address W A Command A Byte 1 A Byte N A P Byte Count A S Address W A Command A Data (Low) Byte AS Address R A Data High Byte1) nA P 1) Optional S Address W A Command A Byte 1 A S Address R A Byte N nA PByte Count A

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11.5 GRAPHICAL USER INTERFACE

www.belpowersolution.com and supports both the PSMI and PMBus® protocols. tree. In the monitoring view the power supply can be controlled and monitored. by changing the load current it can be monitored when the power supply is being disabled for further energy savings. This obviously requires 2 power supplies being operated as a redundant system (as in the evaluation kit). NOTE: The user of the GUI needs to ensure that only one of the power supplies have the hot-standby mode enabled. Figure 17. Monitoring dialog of the I2C Utility provided with a front to rear airflow, which means the air enters through the DC -input of the supply and leaves at the DC -output. The PET2000-12-074xD power supply has been designed for horizontal operation.

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For safety compliant operation the power supply needs to be operating inside the specified operating conditions. with rising temperature. Figure 21 illustrates these maximum current and power levels. Figure 21. Maximum current and power levels PET2000-12-074ND reduced with rising temperature. Figure 22 illustrates these maximum current and power levels. Figure 22. Maximum current and power levels PET2000-12-074RD

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2018 Bel Power Solutions & Protection BCD.00773.0_AE PARAMETER DESCRIPTION / CONDITION CRITERION ESD Contact Discharge IEC / EN 61000-4-2, ±8 kV, 25+25 discharges per test point (metallic case, LED, connector body) A ESD Air Discharge IEC / EN 61000-4-2, ±15 kV, 25+25 discharges per test point (non-metallic user accessible surfaces) A Radiated Electromagnetics Filed IEC / EN 61000-4-3, 10 V/m, 1 kHz/80% Amplitude Modulation, 1µs Pulse Modulation, 10 kHz ... 2 GHz A Burst IEC / EN 61000-4-4, Level 3 DC input port ±2 kV, 1 minute A Surge IEC / EN 61000-4-5 ; NEBS GR-1089-CORE Issue 6 Common mode: ±1 kV (2 Ohm) Differential mode : ±1 kV (2 Ohm) A RF Conducted Immunity IEC / EN 61000-4-6, Level 3, 10 Vrms, CW, 0.1 … 80 MHz A PARAMETER DESCRIPTION / CONDITION CRITERION Conducted Emission EN 55022 / CISPR 22: 0.15 … 30 MHz, QP and AVG, single power supply Class A - 6 dB Radiated Emission EN 55022 / CISPR 22: 30 MHz … 1 GHz, QP, single power supply Class A - 6 dB Acoustical Noise Distance at bystander position, 25°C, 50% Load 65 dBA PARAMETER DESCRIPTION / CONDITION NOTE Agency Approvals UL 60950-1 2nd Edition CAN/CSA-C22.2 No. 60950-1-07 2nd Edition IEC 60950-1: 2005 EN 62368-1: 2014 EN 60950-1: 2006 EN 62368-1: 2014 NEMKO NO P16221006, NO P18222683 EAC NO 0324871, CQC NO CQC16001147490 Approved Isolation Strength Input plus to chassis; 1414V for 1 minute Basic Input minus to chassis; 1414V for 1 minute Basic Output to chassis None (Direct connection) Creepage / Clearance Primary to chassis (PE) >2 mm Primary to secondary 14.

14.1 IMMUNITY

14.2 EMISSION

1. Maximum electric strength testing is performed in the factory according to IEC/EN 60950, and UL 60950. Input-to-output electric strength tests should not be repeated in the field. Bel Power Solutions will not honor any warranty claims resulting from electric strength field tests.

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tech.support@psbel.com PARAMETER DESCRIPTION / CONDITION MIN NOM MAX UNIT TA Ambient Temperature Up to 1’000m ASL, PET2000-12-074ND Up to 1’000m ASL, PET2000-12-074RD -5 +55 +40 Linear derating from 1’000 to 3’048 m ASL PET2000-12-074ND PET2000-12-074RD +45 +30 TAext Extended Temp. Range PET2000-12-074ND PET2000-12-074RD 70 TS Storage Temperature Non-operational -20 +70 °C Altitude Operational, above Sea Level - 3’048 m Non-operational, above Sea Level - 10’600 m Shock, operational Half sine, 11ms, 10 shocks per direction, 6 directions 1 g peak Shock, non-operational 30 g peak Vibration, sinusoidal, operational IEC/EN 60068-2-6, sweep 5 to 500 to 5 Hz, 1 octave/min, 5 sweep per axis 1 g peak Vibration, sinusoidal, non-operational 4 g peak Vibration, random, operational 7.7grms 30min, 3 axes operational 7.7 Grms Vibration, random, non-operational IEC/EN 60068-2-64, 5 to 500 Hz, 1 hour per axis 0.025 g2/Hz PARAMETER DESCRIPTION / CONDITION MIN NOM MAX UNIT MTBF Mean time to failure According Bellcore TR-TSY-000332, Issue 3 TA = 25°C, Vi = 48 VDC, 0.5 ∙ I1 nom, ISB nom 683 kh Expected life time TA = 25°C, Vi = 48 VDC, 0.7 ∙ I1 nom, ISB nom 7 years TA = 55°C, Vi = 48 VDC, I1 nom, ISB nom 2 PARAMETER DESCRIPTION / CONDITION MIN NOM MAX UNIT Dimensions * Width 73.5 mm Heigth 40.0 mm Depth 265.0 mm m Weight 1.2 kg 16. 17. 18.

22 PET2000-12-074xD

Figure 26. Polarizing screw Table 5. Output connector pin assignment

Figure 27. Mating connector drawing page 1

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Figure 28. Mating connector drawing page 2

Figure 29. Mating connector drawing page 3

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tech.support@psbel.com ITEM DESCRIPTION ORDERING PART NUMBER SOURCE I2C Utility Windows XP/Vista/7 compatible GUI to program, control and monitor Front-End power supplies (and other I2C units) ZS-00130 belfuse.com/power-solutions Evaluation Board Connector board to operate PET2000-12-074NA and PET2000-12-074ND. Includes an on-board USB to I2C converter (use I2C Utility as desktop software). YTM.00046 belfuse.com/power-solutions NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. 20.