3
−
4 Maintenance & Troubleshooting
MN427
Suggested bearing and winding RTD setting guidelines for Non
−
Hazardous Locations ONLY
RPM AC cooling tower motors are built with a Class H winding insulation system.
The following tables show the suggested alarm and trip settings for RTDs. Proper bearing and winding
RTD alarm and trip settings should be selected based on these tables unless otherwise specified for
specific applications.
If the driven load is found to operate well below the initial temperature settings under normal conditions,
the alarm and trip settings may be reduced so that an abnormal machine load will be identified.
The temperature limits are based on the installation of the winding RTDs imbedded in the winding as
specified by NEMA. Bearing RTDs should be installed so they are in contact with the outer race on ball
bearings.
Winding RTDs
−
Temperature Limit In
5
C (40
5
C Maximum Ambient)
Motor Load
Class H Temp Rise
3
125
C
Alarm
Trip
3
Rated Load
175
185
Note:
S
Winding RTDs are factory production installed, not from Mod
−
Express.
S
When Class H temperatures are used, consider bearing temperatures and relubrication requirements.
Bearing RTDs
−
Temperature Limit In
5
C (40
5
C Maximum Ambient)
Bearing Type
Grease
Anti
−
Friction
Alarm
Trip
Standard
100
110
This Manual:http://www.manuallib.com/baldor/mn427-inverter-duty-pm-motors-manual.html