Table 4: PTC-thermistor
Description Measured value Fault values
The PTC-
thermistor is a
semiconductor
device.
Resistance at normal temperature:
• 50-100 ohm (150-300 ohm for three
in series).
• Above the tripping point, T
Ref
, the
resistance increases dramatically to
several Kohm.
• An infinite value (open circuit)
indicates a fault (a wire is broken or
there is a bad contact in a connector).
• A value close to zero indicates a
short circuit in the wiring.
Table 5: Pt100 sensor
Description Measured value Fault values
The Pt100 sensor is
a resistor changing
value almost linearly
with temperature.
Resistance:
• 100 ohm at 0ºC (32ºF)
• 107.79 ohm at room temperature
(20ºC, 68ºF)
• 138.5 ohm at 100ºC (212ºF)
For resistance data between 0–160 0ºC
(32–212ºF), see Pt100 resistance (page
32).
Never connect the Pt100 sensor to a
voltage higher than 2.5 V.
> 200 ohm (approx.) can indicate the
following situations:
• Broken sensor
• Bad contact
• Broken lead
< 70 ohm (approx) indicates:
• Short circuit.
For information on the various configurations of switches, thermistors and sensors used to monitor stator
winding temperature, see Stator temperature monitoring methods (page 31).
FLS
Table 6: Float switch sensor (FLS)
Description Measured value Fault values
The float switches are leakage
sensors located in the lower part of
the stator housing and in the
junction box.
Resistance. 2 sensor variants:
FLS:
• Normal: 1530 ohm
• Alarm: 330 ohm
FLS-10:
• Normal: 1200 ohm
• Alarm: 430 ohm
> 10% (approx.) deviation
from rated ohm values
indicates sensor fault, or fault
in the wiring.
VIS10
Table 7: Vibration sensor (VIS10)
Description Measured value Fault values
The vibration sensor located in
the junction box measures
vibrations in one direction. The
output is a 4-20 mA signal
proportional to the vibration
level.
Current, 4-20 mA
• >> 20 mA indicates a short circuit.
• << 4 mA indicates a fault.
• A zero value indicates a broken wire or bad
contact in a connector.
Product Description
30 C3300/6x5, C/R3231, C3240, C3306, C3312, C3351, C3356, C3400, C3501, C3531, C3602, C3800 Installation,
Operation and Maintenance Manual
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