Watlow CPC400 - Manual (Page 175)

CPC400 Series User’s Guide Chapter 6: Troubleshooting and Reconfiguring
Doc. 0600-2900-2000 Watlow Anafaze 161
RTD Inputs
For each RTD input, you must install three resistors: RA,
RB, and RC. The resistance must be correct for the expect-
ed input range. RA and RB are a matched pair of resistors.
Install them in the resistor pack (RP) locations as shown in
the illustration below.
Resistor values:
• RA/RB: 25 k
Ω
• RC: 18.2 Ω
Resistor tolerances:
• RA/RB: Matched to 0.02% ( ± 5 ppm/˚C) with absolute
tolerance of 0.1% ( ± 25 ppm/˚C)
• RC: Accurate to 0.05% ( ± 5ppm/˚C)
Table 6.7 Resistor Locations for RTD Inputs
Loop
Resistor Locations
RA/RB RC
1 RP1 R57
2 RP2 R55
3 RP3 R53
4 RP4 R51
5 RP5 R49
6 RP6 R47
7 RP7 R45
8 RP8 R43
RP#
RA RB