GSI Outdoors PNEG-338 - Manual (Page 21)

PNEG-338 Portable Dryer Installation Manual 21
9. Electrical Power Supply
Power Supply
An adequate power supply and proper wiring are important factors for maximum performance and long
life of the dryer. Electrical service must be adequate to prevent low voltage damage to motors and control
circuits.
(See Electrical Load Information on Pages 23-30) . Power supply for single phase models must
include a neutral wire.
Transformers and Wiring Voltage Drop
Advise the service representative of the local power supplier that an additional load will be placed on the
line. Check the KVA rating of transformers, considering total horsepower load. The power supply wiring,
main switch equipment and transformers must provide adequate motor starting and operating voltage.
Voltage drop during motor starting should not exceed 14% of normal voltage. After motor is running at full
speed, it should be within 8% of normal voltage. Check electrical load information
(See Pages 24-30) for
HP ratings and maximum amp loads.
Power Supply Disconnect
All dryers are equipped with a power disconnect switch in the power box to permit total power shut down
before opening the power box door, as required for inspection and service. The power disconnect switch
is located on the power box door for quick shut down.
Machine to Earth Grounding
A Machine to Earth Ground Rod must be installed at the dryer. Place the ground rod that comes standard
within eight feet of the dryer and attach it to the dryer control panel with at least a #6 solid, bare, copper
ground wire and the clamp provided. The grounding rod located at the power pole will not provide
adequate grounding for the dryer. Proper grounding will provide additional safety in case of any short and
will ensure long life of all circuit boards, the SCR drive and the ignition system. The ground rod must be
in accordance with local requirements.
Figure 9A Installation of a ground rod (standard with dryer purchase) specifically
for the grain dryer is necessary for safety and equipment preservation.