Simplex NEPTUNE - Page 35

Maintenance/Troubleshoong — 29
9 MAINTENANCE/TROUBLESHOOTING
Simplex load banks are designed to require minimum main-
tenance. All components have been chosen for a long, reliable
life. Most problems can be avoided by simply keeping the con-
trol panel enclosure clear of any debris or foreign objects and
ensuring all electrical connections are tight.
Tighten the electrical connections:
1. Aer the rst use
2. Aer the h use
3. Every 6 months thereaer
• Check the air intake screens and louvers, fan and cooling
chamber, and exhaust openings for any obstructions or for-
eign objects.
• Check fan blades and fan shroud for stress fractures.
• Check the exhaust vent for obstructions
• Check the load branches for blown fuses or opened load re-
sistors.
To check the fuses or load resistors, operate the load bank
from a balanced 3-phase source and check the three line cur-
rents. e three current readings should be essentially the same.
If a sizable dierence is noted, one or more load fuses or load
resistors may have malfunctioned.
Visually inspect the wiring and contactors in the control pan-
el area and wiring in the load element trays for signs of loose
connections. Indications of loose connections include:
1. Discolored wires
2. Black or white discoloration on contactors
3. Signs of electrical arcing.
For a comprehensive inspection, operate the load bank for
ve minutes, then shut it o and conduct a thermal scan of the
control panel area. Loose connections will show up as bright ar-
eas on the thermal scan.
general
maintenanCe
every 6
m
ontHS
Remove all
power from
the load bank
before
servicing the
unit.