Grain Systems PNEG-900 - Manual (Page 35)

4. Electrical Power Supply
PNEG-900 Series 2000 Autoflow Fan/Heater and Control Installation Instructions 35
Grounding
All control boxes should be properly grounded with a ground lug mounted in each control box.
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 39 .)
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 your 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
on Page 39 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 that comes standard, 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.