Specifications

Simplex, Inc., 5300 Rising Moon Road, Springfi eld, IL 62711-6228 • 217-483-1600 • Fax [phone]
Merlin-150-300c.indd • © 2011 Simplex, Inc. All Rights Reserved. • Printed in the USA. • www.simplexdirect.com
LOAD BANK MANUAL • Merlin 150-300 Load Bank • page 8 of 15
MAINTENANCE
The Load Bank has been designed
to require minimum maintenance. All
components have been chosen for a
long, reliable life. Two basic intervals
of maintenance are required: each op-
eration and every 50 hours or 6 months
(whichever comes fi rst).
EACH OPERATION
The air intake screens and louvers,
fan and cooling chamber, and exhaust
openings must be checked for any
obstructions or foreign objects. Due to
the high volume of air circulated, paper
and other items can be drawn into the
air intakes. During Load Bank opera-
tion insure that air is exiting from the
exhaust vent.
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 cooling fan
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”.
For continued safety and for
maximum equipment protec-
tion, always replace fuses with
one of equal rating only.
Always remove all power from
the load bus and all fan/control
power before servicing the Load
Bank. Never operate or service
a Load Bank that is not properly
connected to an earthground.
TROUBLESHOOTING
This section is designed to aid the
electrical technician in basic Load Bank
system troubleshooting. All of the prob-
lems listed can be verifi ed with a basic
test meter and/or continuity tester. For
safety reasons, when troubleshooting a
Load Bank systems always remove all
test source power, fan/control power,
anti-condensation heater power, etc.
COOLING FAN MOTOR WILL
NOT OPERATE
1. Inoperative Fan Circuit Breaker
(FCB)
2. Fan/Control Power not available/
incorrect
3. Inoperative Fan Motor (MOT)
4. Fan Motor Contactor (FMC)
de-energized
5. Restriction of air (intake or
exhaust)
6. Fan pressure switch inoperative