Ronk Vigilant
®
Owner’s and Installation Manual
13
GENERAL OPERATION
Vigilant
®
Series General Operation
The Vigilant
®
switch in combination with the control board timing
module will allow for the automatic transfer of an electrical load
to a standby power source in the event of an over/under voltage
or frequency condition on any or all phases of the utility power
supply.
In the event of an over/under voltage or frequency condition of
utility power, the onboard control board sensing circuitry will
begin the initiation of the transfer process. Upon initial sensing of
a loss of utility power, the Vigilant
®
transfer switch is specifically
designed to allow an engine start time delay period (TDES) to
expire before starting the generator. This engine start time delay
is user-adjustable from the control board, preventing unnecessary
engine starts from a temporary loss of utility. In the event the
utility source is not restored after the engine start time delay has
expired, the remote contacts will close, sending a signal to the
generator’s automatic start controller.
When the control board senses that the generator has started,
and is within acceptable limits, the transfer switch will wait until
the utility to generator time delay (TDNE) has expired before
switching to the neutral position. While in the neutral position,
the transfer switch will transfer back to utility supply if the utility
is restored. With no utility source, the transfer switch will stay in
the neutral position until the delay on neutral time has expired,
allowing the transfer switch to temporarily stop at the neutral
position during either the utility to generator or generator to
utility transfers. The temporary stop allows controlled isolation
between both utility and generator sources. After the neutral delay
has expired, the transfer switch will complete the transfer to the
destination source. All connected loads will be transferred to the
generator power source.
While the transfer switch is in the generator position, the control
board will constantly monitor the utility source voltage and
frequency status. Once the utility source is restored, the transfer
switch will wait until the generator to utility time delay (TDEN) has
expired before switching to the neutral position. The TDEN delay
is user-adjustable from the control board to prevent unnecessary
transfers caused by momentary utility restoration conditions.
If the utility source remains stable after the generator to utility
time delay expires, the transfer switch will transfer to the neutral
position. The transfer switch will stay in the neutral position
until the delay on neutral time has expired. If the utility source
fails during this delay period, there will be a transfer back to the
generator position. When the delay on neutral time expires, the
transfer switch will transfer to the utility position. All connected
loads are transferred to the utility power source.
When connected loads are transferred back to the utility power
source, an engine cooldown period (TDEC) will be initiated,
allowing the generator to run in a no-load condition. This engine
cooldown time delay is user-adjustable from the control board,
allowing the generator to continue running for an adjustable
period after the utility is restored.
