FLYGT C3501 - Stator Temperature Monitoring Methods

CLS
Table 8: Water-in-oil sensor (CLS)
Description Measured value Fault values
Capacitive leakage sensor located
in the oil housing. This sensor
issues an alarm if the water
content reaches a concentration of
approximately 30% or more.
Standard drive unit only.
CLS must be connected to 12 V
DC with correct polarity (+/–).
See table below.
Table 9: CLS current measurements
Measuring result Explanation
0 mA Can indicate one of the following conditions:
• The sensor has the wrong polarity. Check by changing plus and minus.
• The cable/lead is broken.
4.0 to 8.0 mA OK
27 to 33 mA Alarm current
> 33 mA Short circuit
Stator temperature monitoring methods
The purpose of stator-winding temperature monitoring is to make the motor shut off at high temperature.
There are several monitoring methods, depending on the voltage of the motor, and types of thermal
sensors chosen.
By using an analogue sensor, two adjustable alarm limits can be used, one for warning (“B”-alarm) and one
for pump stop (“A”-alarm). The configurations which may be used for monitoring the stator-winding
temperature depend upon the voltage range of the drive unit. See Drive units (page 21) for the voltage range
for each drive unit.
Up to 1.1 kV drive units
Table 10: Stator temperature monitoring configuration, up to 1.1 kV
Standard /
Optional
Monitoring Configuration Description
Standard This method uses the following configuration:
• Three thermal switches, connected in series, are incorporated in the coil ends
of the stator winding. The switches are normally closed, and open at 140°C
(285°F).
• One Pt100 sensor is incorporated in one of the windings.
Or:
This method uses the following configuration:
• Three thermistors, connected in series, are incorporated in the coil ends of the
stator windings. T
Ref
=140°C (285°F).
• One Pt100 sensor is incorporated in one of the windings.
Optional
This method uses the following configuration:
• Three thermal switches, connected in series, are incorporated in the coil ends
of the stator winding. The switches are normally closed, and open at 140°C
(285°F).
• Three Pt100 sensors, one for each phase, are incorporated in the windings.
Or:
This method uses the following configuration:
• Three thermistors, connected in series, are incorporated in the coil ends of the
stator windings. T
Ref
=140°C (285°F).
• Three Pt100 sensors, one for each phase, are incorporated in the windings.
Product Description
C3300/6x5, C/R3231, C3240, C3306, C3312, C3351, C3356, C3400, C3501, C3531, C3602, C3800 Installation,
Operation and Maintenance Manual
31