Wilo FKT 50.1 - Page 52

en Appendix
52 WILO SE 2019-01
FKT 50.1 FKT 57 FKT 63.1 FKT 63.2
Terminal room/motor compart-
ment
• • • •
Motor winding
• • • •
Motor bearings
o o o o
Sealing chamber
− − − •
Leakage chamber
• • • •
Vibration sensor
o o o o
External monitoring devices
Sealing chamber
− − − o
Key: − = not available/possible, o = optional, • = as standard
All the monitoring devices fitted must always be connected!
13.3.4.1 Terminal room, motor compart-
ment and sealing chamber monit-
oring
The connection is made as described in the “Electrical connection” section.
13.3.4.2 Monitoring of motor winding
DANGER
Risk of explosion due to overheating of the motor!
If the temperature limiter is connected incorrectly, there is a risk of explosion due to
overheating of the motor! Always connect the temperature limiter to a manual re-
activation lock. This means that a “release button” must be manually activated!
The motor is equipped with a temperature limit (1-circuit temperature monitoring). As
an option, the motor can be fitted with a temperature control and limit function (2-cir-
cuit temperature monitoring).
Depending on the version of the thermal motor monitoring, the following triggering
status must occur when the threshold value is reached:
ƒ Temperature limiter (1temperature circuit):
When the threshold is reached, deactivation with reactivation lock must take place!
ƒ Temperature controller and limiter (2temperature circuits):
When the threshold for the low temperature is reached, the motor can deactivate
with automatic reactivation. When the threshold for the high temperature is
reached, the motor must deactivate with reactivation lock!
CAUTION!Motor damage due to overheating! In the event of automatic reactiva-
tion, comply with the specifications for the maximum switching frequency and
switching break!
Connection of the thermal motor monitoring
ƒ Connect the bimetallic strip via an evaluation relay. Relay “CM-MSS” is recommen-
ded for this. The threshold is preset.
Connection values: max. 250V(AC), 2.5A, cosφ=1
ƒ Connect the PTC sensor via an evaluation relay. Relay “CM-MSS” is recommended
for this. The threshold is preset.
13.3.4.3 Sealing chamber monitoring (ex-
ternal electrode)
ƒ Connect the external pencil electrode via an Ex-rated evaluation relay! Relay
“XR-4…” is recommended for this.
The threshold is 30kOhm.
ƒ The connection must be made using an intrinsically safe circuit!
13.3.4.4 Leakage chamber monitoring
Connect the float switch using an evaluation relay! Relay “CM-MSS” is recommended
for this. The threshold is already pre-set.
13.3.4.5 Monitoring of motor bearing
The connection is made as described in the “Electrical connection” section.
13.3.4.6 Frequency converter operation
ƒ Type of converter: Pulse-width modulation
ƒ Continuous duty: 30Hz up to rated frequency (50Hz or 60Hz). Comply with the
minimum flow velocity!
ƒ Min. switching frequency: 4kHz