Watlow PPC-2000 Bedienungsanleitung Seite 59

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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.
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