PNEG-696
TopDry Series 2000 Autoflow
11
3. 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 enough to prevent low voltage damage to motors and
control circuits (See electrical load information.)
Transformer and Wiring Voltage Drop
It is necessary to know the distance from the unit to the available transformer and the horsepower
of your 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 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.