Precision Control Systems 930 - Manual (Page 10)

Model 930 ControlIR TM Instruction Manual Operating Instructions
Research, Inc. Page 6 of 25
Power Wiring Connections
Line Connections
Load Connections
Figure 3-2
CONTROL
CONNECTIONS
Cooling Flow On/Off
Relay Output
Referring to the wiring specification in Table 3-1, connect the external power lines to
the top of the disconnect switch.
The model 930 power control system has 2 (3-pole) load fuseblocks for distributing the
Three-phase power to your process. For the 120 Amp systems, do not exceed more
than 60 amps – 3 phase per fuseblock. For the 160 Amp systems, do not exceed more
than 80 amps – 3 phase per fuseblock. The heater load should be wired to evenly
distribute the number of individual lamps or heating elements to the 2 (three phase)
load circuits. It is suggested to balance the load circuits by having the same number
and size of lamps or heating elements per phase and per load circuit.
Refer to Figure 3-3 for connection of the following items.
This feature provides a normally closed and open (form C) dry contact relay output to
control cooling flow.
Connect the cooling solenoid /chiller/contactor circuit to TB-100 pins 24 (NC), 25
(COM), 26 (NO) as required.