Grain Systems PNEG-728 - Manual (Page 9)

9
Autoflow Operation
Power Supply
An adequate power supply and proper wiring are impor-
tant 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 cir-
cuits (see Electrical Load Information). In 220V 1-phase
and 220V 3-phase systems, a separate neutral wire is
required for the 120V heater circuit, and should be
connected to terminal #1 in the master heater. Do not
run in conduit with motor power lines.
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 fuse or circuit
breaker disconnect switch. Check on KVA rating of trans-
formers, considering total horsepower load. The power
supply wiring, main switch equipment and transformers
must provide adequate motor starting and operating volt-
age. Voltage drop during motor starting should not ex-
ceed 14% of normal voltage, and after motor is running
Transformer and Wiring Voltage Drop
ELECTRICAL POWER SUPPLY
Dave, any ideas what to put here,if anything?
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 Stan-
dard Handbook by National Fire Protection Association).
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 feet (4.572 meters) away. Place
the ground rod that comes standard, within 8 feet
(2.438 meters) 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.
Machine to Earth Grounding