The engine start timer is also referred to as the "P" timer.
The engine start timer is used to ensure that the transfer switch does not start the engine during momentary outages. The time range is zero to ten seconds. The timer begins when the normal power source fails to meet the adjusted parameters. When the timer has elapsed, the contacts of the engine start relay will operate in order to start the engine. The engine start timer can be adjusted by using the "P(SEC)" dial on the back of the controller. The factory default setting is three seconds.
The delay to emergency timer is also referred to as the "W" timer.
This timer is used to ensure that the generator is stable before the transfer occurs. The time range is zero to fifteen seconds. The timer begins once the output of the generator satisfies the adjusted parameters. When the timer has elapsed, the transfer to the emergency power source will be initiated. The transfer to emergency timer can be adjusted by using the "W(SEC)" dial on the back of the controller. The factory default setting is one second.
The ATS is not dedicated to the transfer to the emergency power source. If the voltage of the normal power source is restored before the completion of the transfer to emergency timer, the ATS will remain in the normal position. The engine cooldown timer will be initiated.
The delay to normal timer is also referred to as the "T" timer.
This timer is used to verify that the normal power source has consistently met the parameters of the sensors for a minimum amount of time. The time range is zero to thirty minutes. The timer begins when the normal power source satisfies the parameters of the sensors. When the timer has elapsed, the transfer to the normal power source will be initiated. The transfer to normal timer can be adjusted by using the "T(MIN)" dial on the back of the controller. The factory default setting is thirty minutes.
The engine cooldown timer is also referred to as the "U" timer.
This timer is used in order to run the generator without a load before the engine is stopped. The time range is zero to five minutes. The timer will start after the switch transfers to the normal power source. When the timer has elapsed, the engine start relay will operate in order to stop the engine. The engine cooldown timer can be adjusted by using the "U(MIN)" dial on the back of the controller. The factory default setting is five minutes.
The delay from open to normal timer is also referred to as the "DT" timer. The delay from open to emergency timer is also referred to as the "DW" timer.
The open delay timers are only present on CTGD models. These timers are used to control the center open position of delay transfer switches in order to allow the back EMF of the load to discharge before re-energizing the load. These timers have a range of zero to thirty seconds.
The "DT" timer controls the time of the transfer while the switch is open during the transfer from the emergency power source to the normal power source. The "DT" timer can be adjusted by using the "DT(SEC)" dial on the back of the controller. The "DW" timer controls the time of the transfer while the switch is open during the transfer from the normal power source to the emergency power source. The "DW" timer can be adjusted by using the "DW(SEC)" dial on the back of the controller. The factory default setting for both timers is five seconds.
The pre-signal timers are not available on CTGD units.
These timers are used to provide an output prior to the transfer. These outputs are provided in order to coordinate systems for the interruption that will occur while the transfer takes place. These timers have a range of zero to sixty seconds. The time ranges are adjustable in one second increments. The "T3" timer takes place prior to the transfer to the normal power source, and the "W3" timer takes place prior to the transfer to the emergency power source. Output of these timers are usually used in conjunction with elevators. Output of these timers are also used in conjunction with a UPS.
The "A6" option uses the "TA5" timer and the "TA6" timer. The "A6" option allows loads from motors to be disconnected prior to the transfer of power. See Installation, "Output Option Connections of the Controller".
The "TA5" timer will provide a pre-signal for the contacts. The pre-signal is used when the switch transfers the load from the emergency position to the normal position. This option is configured without a feature that will bypass a dead source. The bypass is utilized on the standard "T3/W3" model.
The "TA6" timer will provide a pre-signal for the contacts. The pre-signal is used when the switch transfers the load from the normal position to the emergency position. This option is configured without a feature that will bypass a dead source. The bypass is utilized on the standard "T3/W3" model.