Hubbell LX-440 - Manual (Page 12)

Transfer Switch
Page 12 of 16 Pages
Time Delay function Typical factory setting Adjustment Range
NORMAL OVER-RIDE ON
MONETARY OUTAGE 1 second, engine generator
3 seconds, utility 0.5 to 6 seconds
RETRANSFER TO NORMAL 30 minutes 2 to 30 minutes
ENGINE RUNNING UNLOADED 5 minutes 2 to 30 minutes
EMERGENCY OVER-RIDE ON
MOMENTARY OUTAGE 1 second 0.5 to 6 seconds
TRANSFER TO EMERGENCY 2 seconds 0 seconds to 5 minutes
NEUTRAL POSITION TIME DELAY
(optional) 3 seconds 1 second to 10 minutes
Frequency Monitor 60 Hz 30 to 100 Hz
Table 6-1 Troubleshooting
Condition Possible cause Checks Action
Switching mechanism
jammed
Isolate power sources
Actuate transfer switch
manually
Transformer fault
Check for 115 V output
from transformers
Replace transformer
Automatic transfer
switch does not transfer
LED’s on Control
Module indicate proper
timing sequence,
voltage, and frequency
TCR board fault
Inspect board for damage
Check TCR and TR
relays
Check board components
with ohm meter
Repair/Replace TCR board
Phase Rotation
Monitor fault
(ATS/Fire Pump)
Check for correct phase
sequence.
Check PRM w/ ohm
meter Correct line connections for
proper phase sequence.
Replace PRM
Automatic transfer
switch transfers when
normal source OK
Control Module
Check VOLTAGE
MONITOR LED’s Repair/Replace Control
Module
Engine Start Relay
Check contacts at PTB1-
1 and -2
Replace MB relay
Engine generator does
not start
Control Module fault
Check Engine Start
Contacts Repair/Replace Control
Module
Engine generator
continues to run
unloaded Engine Start Relay
fault
Relay circuit fault
Check relay on Control
Module Repair/Replace Control
Module
7.0 Transfer Control Relay Board
Refer to schematic 49271-500.
The primary purpose of the Transfer Control Relay board is to control the operation of the switching
mechanism. The board also has the isolation switch alarm circuit and relays.