The ST-110/ST-111/ST-112/ST-113 are programmable multirange timers for high speed electronic reset applications. The ST-110/ST-112 covers a time range of 0,15 to 120 seconds while the ST-111/ST-113 covers a range of 10 seconds to 240 minutes. Time adjustment is provided in six overlapping ranges. The units interface readily with three wire NPN/PNP proximity sensors, potential free contacts or limits switches, providing high speed reset operation. The timer is reset by closing the contact between the reset inputs. If another reset occurs before the set time period has expired, the timer is set back to zero and a new timing cycle is initiated.
The units can be programmed to operate in either one of the following modes:
1. Delayed On Operation, Hold Reset: When power is applied, the relay remains de-energised until reset occurs. When the reset contact is released, the timer starts running and the relay energises when the set time has elapsed. When the reset contact closes again, the relay switches off and the timer assumes a reset and hold mode. When the reset contact releases, the timer starts running, and the relay remains off until the set time has elapsed. When the set time has expired, the relay switches on until another reset occurs.
2. Delayed On Operation, Pulse Reset: When power is applied, the relay remains de-energised until a reset occurs. When the reset contacts closes, the timer starts running and the relay energises when the set time has elapsed. When the reset contact closes again, the relay switches off and the timer starts running immediately, irrespective of the duration of the reset contact closure. When the set time has elapsed, the relay switches on until another reset occurs.
3. Interval Operation, Hold Reset: When power is applied to the unit, the relay remains de-energised until a reset occurs. When the reset contact closes, the relay energises and the timer assumes a reset and hold mode. When the reset contact releases, the timer starts running and the relay remains energised until the set time has elapsed. When the set time has expired, the relay switches off until another reset occurs.
4. Interval Operation, Pulse Reset: When power is applied to the unit, the relay remains de-energised until a reset occurs. When the reset contact closes, the relay switches on and the timer starts running immediately, irrespective of the duration of the reset contact closure. When the set time has elapsed, the relay switches off until another reset occurs.
