Hubbell LX-440 - Manual (Page 7)

Transfer Switch
Page 7 of 16 Pages
5.0 Standard and Optional Features
Standard Features
The following standard features are provided with the LX-450 automatic transfer switch.
Indicating lights
NORMAL (PL1, Green) When the transfer switch is in the normal position (normal source contacts
closed) auxiliary contact TSN-1NO closes to power the pilot light.
EMERGENCY (PL2, Red) When the transfer switch is in the emergency position (emergency source
contacts closed) auxiliary contact TSE-1NO closes to power the pilot light.
Control Module
LED Indicators
EMERGENCY FREQUENCY MONITOR LED (Green) This LED is on when the emergency source
frequency is within the operating range.
EMERGENCY VOLTAGE MONITOR LED (Red) This LED is on when the emergency source voltage is
above the pick-up level.
ENGINE RUNNING UNLOADED LED (Red) This LED is on when the engine generator is running
during the cool down interval.
NORMAL VOLTAGE MONITOR LED (Green) This LED is on when the normal source voltage is above
the pick-up level.
RETRANSFER TO NORMAL SOURCE LED (Red) This LED is on during the RETRANSFER TO NORMAL
time delay after the normal source voltage rises above the pick-up level.
TRANSFER TO EMERGENCY SOURCE LED (Red) This LED is on during the TRANSFER TO
EMERGENCY time delay after the emergency source voltage and frequency is above the pick-up level.
Time Delays
ENGINE RUNNING UNLOADED TIME DELAY This time delay is provided to allow the engine
generator to run for a cool down period after retransfer to the normal source. At the end of this period,
the engine control relay contacts activate to shutdown the engine generator.
OVERRIDE MOMENTARY OUTAGES ON EMERGENCY SOURCE This time delay overrides a
retransfer to the normal source when the emergency source voltage is low or drops out momentarily.
OVERRIDE MOMENTARY OUTAGES ON NORMAL SOURCE This time delay overrides transfer
when the normal source voltage is low or drops out momentarily.
RETRANSFER TO NORMAL This time delay allows the normal source to stabilize before retransfer.
TRANSFER TO EMERGENCY This time delay allows the emergency source to stabilize before
retransfer.