Wilo EMU TR 212 Instrucciones De Instalación Y Funcionamiento página 49

13.3.4.1 Monitoring the motor winding
13.3.4.2 Pre-chamber monitoring (external
electrode)
13.3.4.3 Operation on frequency converter
Installation and operating instructions Wilo-EMU TR/TRE 212 ... 326-3
Appendix
DANGER
Risk of explosion due to overheating of the motor!
If the temperature limiter is connected incorrectly, there is risk of explosion due to over-
heating of the motor! Always connect the temperature limiter to a manual reactivation
lock. This means that a "release button" must be manually activated!
The installed sensor specifies the trigger temperature as part of thermal motor monitoring.
Depending on the thermal motor monitoring version, the following triggering status must
occur when the trigger temperature is reached:
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Temperature limiter (1 temperature circuit):
The unit must be deactivated with anti-reactivation lock once the trigger temperature
has been reached!
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Temperature controller and limiter (2 temperature circuits):
Once the trigger temperature for the low temperature is reached, the motor can deacti-
vate with automatic reactivation. Upon reaching the trigger temperature for the high
temperature limit, the motor must deactivate with manual anti-reactivation lock.
CAUTION! Motor damage due to overheating! In the event of automatic reactivation,
comply with the specifications for the maximum switching frequency and switching
break!
Connection of the thermal motor monitoring
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Connect the bimetallic strip using an evaluation relay. The "CM-MSS" relay is recom-
mended for this purpose.
Connection values: Max. 250 V(AC), 2.5 A, cos φ = 1
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Connect the PTC sensor via an evaluation relay. The "CM-MSS" relay is recommended for
this purpose.
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If a frequency converter is used, connect the temperature sensor at the Safe Torque Off
(STO). This guarantees that the hardware deactivates the pump.
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Connect the external pencil electrode via an Ex-rated evaluation relay! Relay "XR-4..." is
recommended for this.
The threshold is 30 kOhm.
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The connection must be made using an intrinsically safe circuit!
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Converter type: pulse-width modulation
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Min./max. frequency during continuous duty:
–
Asynchronous motors: 30 Hz up to rated frequency (50 Hz or 60 Hz)
–
Permanent magnet motors: 30 Hz up to the stated maximum frequency as per the
rating plate
NOTICE! The maximum frequency may be below 50 Hz!
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Min. switching frequency: 4 kHz
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Max. overvoltage at the terminal board: 1350 V
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Output current at the frequency converter: max. 1.5 times rated current
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Max. overload time: 60 s
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Torque applications: quadratic pump curve or automatic energy optimization procedure
(e.g. VVC+)
Required speed/torque curves are available on request!
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Observe additional measures with regard to EMC regulations (choice of frequency con-
verter, filters, etc.).
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Never exceed the rated current or rated speed of the motor.
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It must be possible to connect the motor's own temperature monitoring (bimetallic strip
or PTC sensor).
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If the temperature class is marked as T4/T3, temperature class T3 applies.
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