Grain Systems PNEG-634 - Manual (Page 25)

PNEG-634 2000 Top Dry Fan/Heater 25
4. Electrical Power Supply
Power Supply
An adequate power supply and proper wiring are important factors to achieve maximum performance and
long life of the dryer. Electrical service must be adequate enough to prevent low voltage damage to motors
and control circuits. (See electrical load information
on Page 29 .)
Transformer and Wiring Voltage Drop
It is necessary to know the distance from the unit to the available transformer and the horsepower of the
fan unit. Advise the service representative of the local power supplier that an additional load will be placed
on the line. Each fan motor should be wired through a fused or circuit breaker disconnect switch. Check
on 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 and after motor is running at full speed it
should be within 8% of normal voltage. Check electrical load information for HP ratings and maximum amp
loads to properly size wire and fusing elements. Standard electrical safety practices and codes should be
used. (Refer to National Electrical Code Standard Handbook by National Fire Protection Association.)
Machine to Earth Grounding
It is very important that a Machine to Earth Ground Rod be installed at the fan. This is true even if there is
a ground at the pole 15' away. Place the ground rod within 8' 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. The proper grounding will provide
additional safety in case of any short and will ensure long life of all circuit boards and the ignition system.
The ground rod must be in accordance with local requirements.