305E ATC | Alldatasheet
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Automatic Timing & Controls 800.727.5646 atcdiversified.com Motor-Driven Analog Reset Timer Noted for its circuit flexibility, the 305 also provides the highest accuracy among analog timers. Available for either ON-Delay or OFF- Delay operation. The 305 provides delay, interval or pulse timing function for up to 7 load circuits through two instantaneous and two delayed switches. It features a plug-in design and cycle progress indication. HIGHEST ACCURACY: Because of its exclusive infinite engagement clutch, the 305 has a repeat accuracy of 0.2%, highest of any timer in its class. PLUG-IN AND DUST-TIGHT DESIGN: By virtue of its true plug-in design, the body of a 305 can be replaced in seconds without disturbing the housing or disconnecting the wiring. Its gasketed dial assembly forms a dust-tight seal against the housing, whether panel or surface-mounted. FASTEST RESET: All 305 timers reset to a full-scale setting within 0.1 second, proportionately faster for shorter settings. CIRCUIT FLEXIBILITY: All the contacts of its two instantaneous and two delayed load switches are externally accessible at a 14 point terminal block. LONGEST LIFE: With an average mechanical life expectancy of over 5,000,000 operations before the first failure, the 305 is the leader in its class. PILOT LIGHT: A built-in pilot light indicates that the timer is running. The 305 is a synchronous motor-driven timer with an electrically-operated clutch equipped either for ON-Delay or OFF-Delay operation. ON-DELAY: When power is applied (start signal on), the clutch solenoid is energized. Two things happen immediately and simultaneously, the instantaneous switches transfer from one set of contacts to the other, and the motor begins to drive the cycle progress pointer toward zero. At the end of the timed period, the pointer trips one of the delayed switches, a brief time later (about 1/2% of full scale), the other delayed switch is tripped, stopping the timer motor but leaving the clutch en- gaged. The timer does not reset until power to the clutch is removed. OFF-DELAY: Timing starts when power is removed (start signal off), from the spring-loaded, normally engaged clutch. The timer is reset when power is restored to the clutch solenoid; simultaneously, the instantaneous contacts are tripped. Action of the delayed contacts is the same as with ON-Delay timers. A power outage stops the motor but does not reset the OFF-Delay 305E. OPERATION ON DELAY Timing Sequence** SWITCH CONTACTS Before During End of Start Cycle Cycle * Instantaneous 14-9/6-8 14-10/6-7 Delayed (D2) 11-12 11-13 Delayed (D1) 4-5 4-3 * D2 trips approximately 1/2% of range after end of cycle. Assumes a sustained closed start signal (i.e. longer than the dial set time). OFF DELAY Timing Sequence SWITCH CONTACTS Before During End of Start Cycle Cycle * Instantaneous 14-9/6-8 14-10/6-7 Delayed (D2) 11-12 11-13 Delayed (D1) 4-5 4-3 * D2 trips approximately 1/2% to 5% of range after end of cycle. ** Assumes a sustained closed start signal (i.e. longer than the dial set time). BLACK Circuit Closed GRAY Circuit Open ELECTROMECHANICAL TIMER 305E Series E24305 Automatic Timing & Controls 800.727.5646 atcdiversified.com
ELECTROMECHANICAL TIMER 305E Series SPECIFICATIONSDIMENSIONS (INCHES/MILLIMETERS) WIRING MODELS ON-Delay OFF-Delay RANGES (AC) 13 standard ranges, from 6 SEC to 60 HRS at 60 Hz. REPEAT ACCURACY AC MODELS: – 0.2% of full scale (For ranges of
60 SEC or less, it may be necessary to run timer
motor before start to achieve related accuracy) RESET TIME 0.1 SEC, full scale MIN. SETTING 1/60th of range (all models except 0.3 SEC for
6 SEC model)
DIAL DIVISIONS 6 SEC, 60 SEC, 120 SEC, 240 SEC,
60 MIN, 240 MIN, 6 HR, and
60 HR =120 Dial Divisions
30 SEC, 15 MIN, 30 MIN, 15 HR., and 30 HR =150 Dial Divisions LIFE EXPECTANCY MECHANICAL: over 5,000,000 operations CONTACTS: 3,000,000 operations under resistive or inductive load of 1A TIMING MOTOR Synchronous, permanently lubricated TIMING Single cycle interval or delay LOAD SWITCHES INSTANTANEOUS: two, each SPDT; self-cleaning, heavy-duty silver contacts. DELAYED: two, each SPDT; precision type, silver contacts CONTACT RATING (non-inductive): 10 amps, 120 VAC PILOT LIGHT Wired in parallel with motor. TERMINALS 14 screw terminals accessible at rear; integral wiring diagram on timer housing. HOUSING Plug-in design; completely gasketed, dust-tight when surface or panel-mounted POWER AC MODELS: 120, 60Hz (all ranges), REQUIREMENTS (– 10%, - 10%) AC MODELS: running current 0.128 A (115 VAC) inrush current 0.628 A (115 VAC) TEMPERATURE 32° to 140°F (0° to 60°C) RATING WEIGHT NET: 2 lb., 6 oz. SHIPPING: 2 lb., 12 oz. MOUNTING STANDARD: Hardware is provided to mount timer ACCESSORIES so that it is dust-tight from front of panel. OPTIONAL: Surface mounting with rear-facing terminals. (See Accessories) AC WIRING TERMINAL WIRING
Automatic Timing & Controls 800.727.5646 atcdiversified.com ELECTROMECHANICAL TIMER 305E Series MODEL NUMBER RANGE-60 CYCLES 120 VAC
6 SEC 101
30 SEC 006
60 SEC 007
120 SEC 008
240 SEC 011
15 MIN 015
30 MIN 016
60 MIN 017
240 MIN 019
6 HR 030
15 HR 021
30 HR 022
at dial “0.” Switch 11-12-13 transfers 1% later. All timers shown in “before start” position. Diagrams shown with power off unless otherwise marked. Maximum load current through any load carrying contact is 10 amperes. ON-DELAY - Reset on power failure. OFF-DELAY - Non-reset on power failure. INSTANTANEOUS CONTACTS Contacts are transferred when clutch is energized; transferred back, as shown when de-energized. SUSTAINED START (ON DELAY) MOMENTARY START (ON DELAY) OFF DELAY MODEL NUMBER 305E 0 RANGE VOLTAGE & FREQUENCY ARRANGEMENTS ON-DELAY (reset on power interruption) 1 OFF-DELAY (non-reset on power interruption) 2 Special 0 SETTING Knob 0
FEATURES
ACCESSORIES: Surface mounting bracket rear facing terminals 0305-263-64-00 Automatic Timing & Controls 800.727.5646 atcdiversified.com