TP-6126 8/02
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Section 3 Setup and Test
3.5.2
Time Delays
The factory settings for the time delays are shown in
Figure 3-13.
The pre-transfer time delays operate only when both
sources are available.
These delays allow time to
disconnect selected loads before transfer. The load
control LED on the user interface lights when the
pre-transfer signal is active.
The pre-transfer and
post-transfer
time
delays
overlap
the
preferred-to-standby and standby-to-preferred transfer
time delays.
Adjustable Time Delays
Time Delay
Default
Engine start
3 sec.
Preferred to standby
1 sec.
Standby to preferred
15 min.
Off to standby (programmed-transition only)
1 sec.
Off to preferred (programmed-transition only)
1 sec.
Failure to acquire standby source
1 min.
Pretransfer to standby signal
3 sec.
Pretransfer to preferred signal
3 sec.
Post-transfer to standby signal
0 sec.
Post-transfer to preferred signal
0 sec.
Engine cooldown
0 min.
In-phase monitor synch
30 sec.
Figure 3-13
Factory Settings, Time Delays
3.6 Generator Set Preparation
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
Moving rotor.
WARNING
Disconnect all power sources to the transfer switch by
opening upstream circuit breakers or switches to the
transfer switch.
Prepare the generator set for operation. Check the oil
level, coolant level, fuel supply, batteries, and items
specified by the generator set installation or operation
checklist or manual.
Move the generator set master switch to the OFF
position; reconnect the generator engine start battery
cables, negative (--) leads last; and reconnect power to
the generator engine start battery chargers, if installed.
3.7 Functional Test
The functional test includes three checks:
D
Manual Operation Test
D
Voltage Checks
D
Automatic Operation Test
Note:
Perform these checks in the order presented to
avoid damaging the ATS.
Read all instructions on the labels affixed to the
automatic transfer switch.
3.7.1
Manual Operation Test
If you have not already done so, test the contactor
manual operation before proceeding to the voltage
check and electrical operation test.
Note:
Disable the generator set and disconnect the
power by opening the circuit breakers or switches
for both sources before manually operating the
transfer switch.
Follow the instructions in Section 2.4 to check the
transfer switch manual operation.
A contactor in normal and serviceable condition
transfers smoothly without binding when operated
manually. Do not place the transfer switch into service if
the contactor does not operate smoothly without
binding; contact an authorized distributor/dealer to
service the contactor.
Note:
Do not reconnect the power sources at this time.
Proceed
to
the
voltage
check
procedure
described in the following section.
3.7.2
Voltage Check
The voltage, frequency, and phasing of the transfer
switch and the power sources must be the same to avoid
damage to loads and the transfer switch. Compare the
voltage and frequency ratings of the utility source,
transfer switch, and generator set, and verify that the
ratings are all the same.
Use the voltage check procedure explained in this
section to verify that the voltages and phasing of all
power sources are compatible with the transfer switch
before connecting the power switching device and
controller wire harnesses together.
Read and understand all instructions on installation
drawings and labels on the switch. Note any optional
accessories that have been furnished with the switch
and review their operation.
