305E-029-A-2-0-PX

305E Series Noted for its circuit flexibility, the 305 also provides the highest accuracy among analog timers. Available for either ON-Delay or OFFDelay 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. E24305 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. Motor-Driven Analog Reset Timer 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 o­ perations 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. ON DELAY Timing Sequence** SWITCH CONTACTS Before Start During Cycle * End of Cycle * Instantaneous 14-9/6-8 14-10/6-7 OPERATION 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 engaged. 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. ELECTROMECHANICAL TIMER 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. 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 Start Cycle * End of 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 Automatic Timing & Controls 800.727.5646 GRAY Circuit Open automatictiming.com 15 (INCHES/MILLIMETERS) 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 5 amps, 240 VAC WIRING AC WIRING TERMINAL WIRING 16 SPECIFICATIONS MODELS ON-Delay OFF-Delay ELECTROMECHANICAL TIMER 305E Series DIMENSIONS Automatic Timing & Controls 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 REQUIREMENTS AC MODELS: 120, 60Hz (all ranges), (– 10%, - 10%) AC MODELS: running current 0.128 A (115 VAC) inrush current 0.628 A (115 VAC) TEMPERATURE RATING 32° to 140°F (0° to 60°C) 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) 800.727.5646 automatictiming.com 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 VOLTAGE FREQUENCY 120/60 A SETTING Knob 0 FEATURES Basic plug-in timer P Standard Timer X Basic standard unit X Special K ACCESSORIES: Surface mounting bracket rear facing terminals 0305-263-64-00 TYPICAL INSTALLATIONS SUSTAINED START (ON DELAY) CLUTCH SOLENOID MOTOR INDEPENDENT LOADS DEPENDENT LOADS MOMENTARY STARTING CONTACT SUSTAINED STARTING CONTACT LOAD ENERGIZED LOAD DE-ENERGIZED 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. DELAYED CONTACTS Switch 4-5-3 transfers at dial “0.” Switch 11-12-13 transfers 1% later. INSTANTANEOUS CONTACTS Contacts are transferred when clutch is energized; transferred back, as shown when de-energized. MOMENTARY START (ON DELAY) Automatic Timing & Controls 800.727.5646 ELECTROMECHANICAL TIMER 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 305E Series MODEL NUMBER ON-DELAY - Reset on power failure. OFF-DELAY - Non-reset on power failure. OFF DELAY automatictiming.com 17