Farm Fans C-2120A, Руководство оператора, Страница: 11 / 68

ELECTRICAL POWER SUPPLY
POWER SUPPLY — An adequate power supply and
proper wiring are important factors for maximum per-
formance and long life of the dryer. Electrical service
must be of adequate size to prevent low voltage dam-
age to motors and control circuits. All dryers should be
field provided with a dependable equipment ground.
Electrical power supply should conform to local, state,
or provincial requirements.
POWER SUPPLY DISCONNECT — All dryers should
be equipped with a power disconnect switch external to
the ASC Control Box to permit total power shutdown
before opening ASC dead front, as required for inspec-
tion and service. The power disconnect switch should
be located close to the dryer for quick shutdown.
TRANSFORMERS WIRING VOLTAGE DROP —
Contact the service representative of the power suppli-
er to advise of the additional load to be placed on the
line. Check on KVA rating of transformers, considering
total horsepower load. The power supply wiring, main
switch equipment, and transformers must be capable
of providing adequate motor starting and operating
voltage. Voltage drop during motor starting should not
exceed 14% of normal voltage, and running voltage
(after motor is at full speed) should be within 8% of nor-
mal voltage.
ELECTRICAL LOAD — Table 2-2 indicates the electri-
cal load in horsepower and full load current, for motors
on the dryer, and for auxiliary loading and take-away
conveyors which can be directly connected to the
power circuits in the dryer control panel.
OVERLOAD RELAYS — Most overload relays are
adjustable from 85% to 115% of normal load in
amperes by an adjustment knob in each relay (see
Overload Relay Heater specs in Table 2-2). Dryers are
shipped with overload relay heater elements installed
for the auxilliary conveyor motor sizes as listed in Table
2-2. If different motors are used, the heater elements
must be changed to provide adequate motor overload
protection.
CONNECTING AUXILIARY CONVEYORS
The maximum sizes of auxiliary conveyor motors which
can be powered directly from the dryer's power termi-
nals are listed in Table 2-2. See appropriate power cir-
cuit wiring diagram for terminal connection numbers.
To connect auxiliary auger motors which are LARGER
than the maximum, refer to the following informa tion.
A. Motors that must be powered from a source outside the
dryer must use a separate contactor and overload pro-
tection device for each motor.
B. For automatic operation with 230V 3-phase dryers: use
230V contactor coils and connect LOADING coil to
POWER TERMINALS 7 and 9. Connect UNLOADING
coil to POWER TERMINALS 13 and 15.
C. For automatic operation with 460V 3-phase dryers:
either use a control stepdown transformer to power
230V contactor coil, or use 460V contactor coils and
connect them as described in item B above.
D. When conveyor motors are powered from an external
source and they are connected for automatic opera-
9
Liquid
Propane
(LP)
Natural
Gas
(N)
Total Max Fuel Flow 1 -
Gallons/Hour
Recommended Liquid Line Size
Heater Orifice Drill Size (Pre-
1994 models in parentheses)
Operating Pressure Range (PSI)
Heater Pressure Gauge (Pre-
1994 models in parentheses)
Total Max Fuel Flow
1 - Thousand
Cubic Ft./Hr.
Minimum Pressure at Connection
to Dryer, PSI
Recommended Minimum Line
Size - 100' Distance
Heater Orifice Drill Size (Pre-
1994 models in parentheses)
Operating Pressure Range (PSI)
Heater Pressure Gauge
C-2120A
Top Btm.
3.0 2.3
57
1/2"
.250" .218"
3-15
3.0 2.3
8
2"
.375" .312"
2-7
1. Maximum fuel flow rates listed assume full heat output for gas line sizing purposes. In normal operation the flow rates would
be considerably lower than indicated, due to actual setting used and cycling of heater.
Maximum Heat Capacity (Million BTU/hr)
T A B L E 2 - 1 F U E L S Y S T E M R E C O M M E N D A T I O N S
C-2125A
Top Btm.
4.6 2.3
75
1/2"
.281" .218"
5-22
4.6 2.3
8
2"
.438" .312"
3-8
C-2130A
Top
2
Btm.
6.0 3.0
98
1/2"
.438" .250"
(.344")
3-8
5-22
(5-22)
6.0 3.0
8
2"
.563" .375"
(.500")
3-8
C-2140A
Top
2
Btm.
7.5 3.0
114
1/2"
.500" .250"
3-8 5-22
7.5 3.0
8
2.5"
.625" .375"
3-8