Setpoint priority, Table 18, Module power and miscellaneous i/o – Trane RTWA 70-125 TON User Manual
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RLC-SVD03A-EN
Module Power and Miscellaneous I/O
Setpoint Priority
There are many ways in which the Chilled Water and Current Limit setpoints
can be adjusted or reset when the Options Module is present in the Chiller
control system. The following flow charts show how these methods are prior-
itized and arbitrated under normal operating conditions. When abnormal
conditions are present, such as loss of Tracer communications or out of range
values on external setpoint inputs, the system will default to other methods.
Table 18
Input Values vs. External Current Limit Setpoint
Resist (ohms)
INPUTS
Current (ma)
Voltage (Vdc)
Resulting Current
Limit Setpt (%RLA)±5%
49000
4.0
2.0
40
29000
6.0
3.0
50
19000
8.0
4.0
60
13000
10.0
5.0
70
9000
12.0
6.0
80
6143
14.0
7.0
90
4010
16.0
8.0
100
2333
18.0
9.0
110
1000
20.0
10.0
120