Accuracy: The variation of unit performance, i.e., time delay, voltage trip point, etc., over the specified
conditions of ambient temperature, input voltage range and time between operations.
Adjustability: The changing of a unit set point, within the specified range of unit operation, by means of
internal or external adjustment mechanism (i.e., changing time delay with potentimeter).
Contact Rating: The electrical power handling capability of relay contacts under specified environment
conditions and for a perscribed number of operations.
Delayed Interval Timing Function: Input voltage is applied continuously. The timing cycle is started by
momentarliy actuating the control circuit. The functions of seperate Delay-On-Operate and interval type timers
are combined in one package providing a single OFF-ON-OFF output cycle.
Also called: single shot.
Delay-On-Operate Timing Function: Application of the input voltage starts the time delay. At completion of
the time delay, the relay contacts transfer.
Also called: Delay-On-Make, On-Delay,Delay-On-Pickup.
Delay-On-Release Timing Function: Input voltage must be supplied continuously to timer. Actuation of
control circuit causes relay contacts to transfer immediately. Time Delay starts when control circuit is released.
The relay remains energized for the duration of the time delay, then de-energization.
Also called: Delay-On-Break, Off-Delay, Delay-On-Dropout, Delay-On-Energization.
Frequency Sensor: A device that monitors a predetermined overfrequency and/or underfrequency
condition, and changes output state when these conditions exist.
Hysteresis: The difference between turn-on and turn-off point (example: a voltage sensor).
Interval Timer Timing Function: Application of input voltage causes relay contacts to transfer and time
delay to begin. At completetion of the time delay, the relay contacts return to de-energized state. Also called:
Delay Interval, One Shot.
Output: The switching device, either solid state or electromechanical, used in the unit to control the load
connected to the output terminal (s).
Phase Sensor: A device that monitors for proper phase rotation in 3-Phase systems.
Programmability: Ability to modify function, time delay or input voltage of a timer.
Delay-On-Operate/Interval Timer: The minimum time that input voltage must be interrupted prior to time-
out to insure a successive timing cycle within the specified limits.
Delay-On-Release: The minimum duration of time that control circuit must be re-actuated to insure a new
timing cycle when the control circuit is released.
Delay-On-Operate or Interval Timer: The minimum time that input voltage must be interrupted after the
timing cycle is completed to assure a successive timing cycle within the repeatability specified.
Delay-On-Release: The minimum duration of time that control circuit must be actuated to insure a successive
timing cycle within the repeatability specified when the control circuits is released.
Repeat Cycle Timer Timing Function: Application of power automatically initiates continuous off-on cycling
of the output relay. Also called: Flasher, intervalometer.
Reset Time: The time required for the contacts to return to normal position when power is removed.
Reverse Polarity Protection: Blocking circuitry arrangement within the timer to prevent damage or output
actuation if reverse polarity input voltage is applied.
Tolerance: The difference between specified and actual timing or sense point (factory setup tolerance)
Transient Protection: Prevents damage to unit if positive or negative transients are applied to the unit.
Insures proper operation of the unit during and after transient occurence. MAX. transients are usually specified
as to amplitude and duration, i.e., 1000V for every 1 uSec.
Trip point: The predetermined point at which a sensing device is set to change the output state.
Voltage Sensor: A device that monitors for a predetermined overvoltage and/or undervoltage conditions,
and changes output state when these conditions exist.