800.727.5646 automatictiming.com Automatic Timing & Controls 305E Series Electromechanical Timer // 305E Series 9 Noted for its circuit flexibility, the 305E also provides the highest accuracy among analog timers. Available for either ON-Delay or OFF-Delay operation. The 305E 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 305E 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 305E is the leader in its class. PILOT LIGHT: A built-in pilot light indicates that the timer is running. Moto r -Dr i ven Ana l o g R e s e t T i m er BLACK—Circuit Closed GRAY—Circuit Open SWITCH CONTACTS ON DELAY Timing Sequence** Before Start During 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% of range after end of cycle. ** Assumes a sustained closed start signal (i.e. longer than the dial set time). SWITCH CONTACTS OFF DELAY Timing Sequence** Before Start During 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% of range after end of cycle. ** Assumes a sustained open start signal (i.e. longer than the dial set time). Shown power on. The 305E is a synchronous motor-driven timer with an electricallyoperated 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. \\\OPERATION

\\\SPECIFICATIONS MODELS ON-Delay OFF-Delay RANGES (AC) 16 standard ranges, from 6 SEC to 60 HRS at 60 Hz (7 SEC to 70 HRS at 50 Hz) other ranges on special order. 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) DC MODELS: ± 1.75% of full scale at constant ambient temperature and ± 15% voltage variation (48, 125 and 250V models); ± 3.5% of full scale at constant voltage and 32 to 120°F ambient temperature variations (all models). RESET TIME 0.1 SEC, full scale MIN. SETTING 1/60th of...

800.727.5646 automatictiming.com Automatic Timing & Controls 305E Series Electromechanical Timer // 305E Series 11 CLUTCH SOLENOID MOTOR INDEPENDENT LOADS DEPENDENT LOADS MOMENTARY STARTING CONTACT SUSTAINED STARTING CONTACT LOAD ENERGIZED LOAD DE-ENERGIZED 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. All timers shown in “before start” position. Diagrams shown with power off unless otherwise marked. Maximum load current through any...