Precision Control Systems 930 - Manual (Page 9)

Model 930 ControlIR TM Instruction Manual Operating Instructions
Research, Inc. Page 5 of 25
WIRING
CONNECTIONS
Table 3-1 Wiring Specifications
Conduit entry into the system should be made near the right side of the cabinet for
power wiring, near the center of the cabinet for load wiring, and near the left side for
low voltage control wiring. Assure that metal fragments are not allowed to fall into the
equipment while holes are made for conduit fittings.
We suggest a separate conduit entry should be made for low level DC control wiring if
used. This includes the remote setpoint input or thermocouple wire (temperature
control option).
Wire Ratings:
Wire Temperature Rating: 75
°C or Higher
Line/Load Wiring Voltage Rating (240 VAC systems) 300 VAC Minimum
Line/Load Wiring Voltage Rating (480 VAC systems) 600 VAC Minimum
Control Wiring 300 VAC Minimum
Allowable Wire Sizes:
Current
Rating of
System
Line
Connections
Load
Connections
Ground
Connection
Control
Circuit
Connections
120 Amp
160 Amp #6-250 MCM
#6-250 MCM #6-250 MCM
#6-250 MCM #4-1/0 AWG
#4-1/0 AWG 22-10 AWG
22-10 AWG
Recommended Minimum Wire Sizes:
NOTE:
Wire temperature and connector ampacity ratings are based on NEC 310-16 using
75
°
C copper wire derated for 50
°
C ambient environment.
Current
Rating of
System
Line
Connections
Load
Connections
Ground
Connection
Control
Circuit
Connections
120 Amp
160 Amp 1 AWG
2/0 AWG
6 AWG
4 AWG 6 AWG
6 AWG 16 AWG
16 AWG
Electrical Inputs:
Heater open interlock switch Contacts Rated for 120 VAC at 2.0 A
Cooling flow interlock switch Contacts rated for 120 VAC at 100 mA
Heater over-temp. thermoswitch Contacts rated for 120 VAC at 100 mA
Remote interlock switch Contacts rated for 120 VAC at 100 mA