Current Overload Protection - Trane CVHE Troubleshooting Manual

In the run mode, a "time-to-trip" curve is looked at to determine if a diagnostic should be called.
UCP2 continuously monitors the compressor current to provide running overcurrent and locked
rotor protection. Overcurrent protection is based on the phase with the highest current. It will
trigger a manually resettable diagnostic shutting down the compressor when the current exceeds
the time-trip curve. The compressor overload is based on unit RLA.
The time-trip curve follows:
Figure 10
Overload Trip Time vs % RLA
20
18
16
14
12
10
8
6
4
2
0
102 107
CVHE-SB-32A

Current Overload Protection:

112 117 122 127
%RLA
132 137 142 147 152
93