Watlow PPC-2000 - Manual (Page 59)

PPC-2000 User’s Guide Chapter 2: Hardware Installation
Doc.# 30002-00 Rev 2.3 Watlow Anafaze 35
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CAUTION! Power, input or output circuits with hazardous voltage
levels should not have any live accessible parts.
Wiring Recommendations
Keep the following guidelines in mind when selecting wires and
cables:
• Use stranded wire. (Solid wire can be used for fixed
service; but it makes intermittent connections when you
move it for maintenance.)
• Use #20 AWG TC extension wire. Larger or smaller sizes
may be difficult to install, may break easily, or may cause
intermittent connections.
• Use shielded wire. (The electrical shield protects the
signals and the PPC-2000 from electrical noise.) Connect
only one end of the shield to earth ground.
• Use copper wire for all connections other than
thermocouple sensor inputs.
See Table 2.9 for cable recommendations.
Table 2.9 Cable Recommendations
Noise Suppression
The PPC-2000’s outputs are designed to drive resistive loads.
Open collector outputs can drive solid state relays. These relays
may in turn operate more inductive types of loads such as
Function Mfr. P/N
No. of
Wires
AWG
Gauge
Max.
Length
Analog Inputs
Belden #9154
Belden #8451 2
2 20
22
RTD Inputs
Belden #8772
Belden #9770 3
3 20
22
TC Inputs TC Ext. Wire 2 20
Digital PID Outputs
and Digital I/O Belden #9539
Belden #9542 9
20
24
24
Analog Outputs
Belden #9154
Belden #8451 2
2 20
22
Computer
Communication:
RS232, RS422,
RS485, or 20mA
Belden #9729
Belden #9730
Belden #9842
Belden #9843
Belden #9184 4
6
4
6
4 24
24
24
24
22 4000 ft.
4000 ft.
6000 ft.