Simplex, Inc., 5300 Rising Moon Road, Spring
fi
eld, IL 62711-6228 • 217-483-1600 • Fax 217-483-1616
Lbdman8p.indd (04/11) • © 2011 Simplex, Inc. All Rights Reserved. • Printed in the USA. • www.simplexdirect.com
LOAD BANK MANUAL • LBD Series • page 8 of 16
can be drawn into the air intakes. During
Load Bank operation insure that air is
exiting from the exhaust side.
The load branches should be checked
for blown fuses or opened load resistors.
To check the fuses or load resistors,
operate the Load Bank from a balanced
3-phase source and check the three
line currents. The three current read-
ings should be essentially the same.
If a sizeable difference is noted one or
more load fuses or load resistors may
have malfunctioned.
EVERY 50 HOURS
OR 6 MONTHS
Check the tightness of the electrical
connections. The expansion and con-
traction caused by Load Bank operation
may result in loose connections. The
vibrations caused by the generator set
may also loosen electrical connections.
If the Load Bank is transported “over
the road”, the electrical connections
should be checked for tightness at a
shorter-than-normal time interval. See
“Primary Inspection”.
When troubleshooting Load
Bank systems always remove
all test source power, fan/con-
trol power, anti-condensation
heater power, etc.
TROUBLESHOOTING
This section is designed to aid the
electrical technician in basic Load Bank
system troubleshooting. All of the prob-
lems listed can be veri
fi
ed with a basic
test meter and/or continuity tester. For
safety reasons, when troubleshooting
Load Bank systems always remove all
test source power, control power, anti-
condensation heater power, etc.
COOLING FAILURE
INDICATED
1. Over temperature sensor failure
2. Loss of genset exhaust
3. Air restriction (intake or exhaust)
TEST METERS DO NOT
OPERATE PROPERLY
1. Meter switch failure
2. Meter multiplier resistor inoperative
3. Improper positioning of meter se-
lector switch
4. Current transformer or current
transformer wiring failure
5. Test meter failure
6. Meter fuses open
SOME LOAD STEPS
CANNOT BE ENERGIZED
1. Inoperative load step switches
2. Open load step resistor(s)
3. Inoperative load step relays
4. Inoperative load step contactors
5. Open load step fuses
