Switch Position Led; Sequence Of Operation - Generac Power Systems GTS "W" Owner's Manual

3.12 SWITCH POSITION LED

3.12.1 EMERGENCY
This LED will go ON when main current-carrying con-
tacts have actuated to their STANDBY (emergency) posi-
tion and that power source is available to the transfer
switch.
3.12.2 UTILITY
This LED will go ON when main contacts have actuated
to NORMAL (utility) position and that power supply is
available to the transfer switch.
The switch is equipped with the Inphase Monitor
Control circuit board. The sensors and timers are
adjustable (see SENSOR AND TIMER ADJUSTMENTS).

3.13 SEQUENCE OF OPERATION

When acceptable NORMAL source voltage is available,
you can observe the following:
• Utility voltage Sensor circuit board monitor's NOR-
MAL source voltage and UTILITY ON LED is ON.
• Switch Position - UTILITY LED is ON.
• Transformer reduced LOAD (T) terminal voltage is
delivered to the 7-day exerciser board to operate the
7-day exercise timer.
If you want, you can monitor automatic timers and sen-
sors on the Inphase Monitor Control circuit board, by
observing light emitting diodes (LED's) next to the sen-
sor/timer adjustments.
3.13.1 SEQUENCE 1 - VOLTAGE DROPOUT
• UTILITY source voltage drops below 75-95% of the
Voltage Pickup Setting. The UTILITY ON LED goes
OFF .
• Voltage Dropout sensor is factory set to about 90% of
"pickup" voltage.
• Voltage dropout below this sensor's setting triggers
Sequence 2.
3.13.2 SEQUENCE 2 - LINE INTERRUPT DELAY
• UTILITY voltage dropout below setting of Voltage
Dropout sensor turns on a lIne Interrupt Delay
Timer.
• Line Interrupt Delay may be set for 0.1 to 10 seconds;
has been factory set to about 5 seconds.
• If voltage dropout lasts longer than Line Interrupt
Delay setting, circuit board action closes the auto-
matic start circuit (Wires 178 and 183). When that
circuit closes, engine cranks and starts as controlled
by a circuit board in the generator's control panel.
• Once the standby generator starts and produces volt-
age, the circuit board is turned ON (go to Sequence
3).
Section 3 — Operation
Generac GTS "W" Type Transfer Switch
3.13.3 SEQUENCE 3 - ENGINE MINIMUM RUN
AND WARMUP TIMERS
• This timer establishes the minimum length of time
for the generator to run before you can shut it down.
Timer prevents shutdown of a cold engine.
• Timer is adjustable from 5 to 30 minutes; factory set-
ting is about 20 minutes.
• An engine warmup timer is also turned ON. This
timer permits engine to stabilize and warm up before
loads are transferred to STANDBY. Timer is
adjustable from 5 seconds to 3 minutes; factory set-
ting is about 1 minute.
3.13.4 SEQUENCE 4 - STANDBY VOLTAGE AND
FREQUENCY SENSORS
• If generator AC output voltage and frequency is above
the setting of these sensors, loads transfer to the
STANDBY power source.
• Adjust Standby Voltage Sensor between 85% and 95%
of nominal supply voltage; factory setting is about
95%.
• Adjust Standby Frequency Sensor between 80% and
90% or nominal supply frequency; factory setting is
about 90%.
You can bypass the engine warmup timers by setting
the Engine Warmup Timer Bypass switch to ON.
Loads are transferred to STANDBY as soon as gener-
ator AC voltage and frequency have reached the set-
tings of the Voltage and Frequency sensors without
having to wait for the engine to warm up.
3.13.5 SEQUENCE 5 - VOLTAGE PICKUP
• If the UTILITY source voltage is restored above the
setting of the Voltage Pickup sensor, Sequence 5
begins.
• Adjust Voltage Pickup between 85% to 95% of the
normal supply voltage from the UTILITY source; fac-
tory setting is about 90%.
3.13.6 SEQUENCE 6 - RETURN TO UTILITY
TIMER
• This timer prevents re-transfer that a Utility Source
voltage surge or transient might cause.
• Adjust timer between 1 to 30 minutes; factory setting
is about 5 minutes.
• If UTILITY voltage remains above the setting of the
Voltage Pickup Sensor for the time interval of the
Return to Utility Timer setting, loads are re-trans-
ferred back to the UTILITY source.
Generac
NOTE:
® Power Systems, Inc. 11