en
Installation and operating instructions • Wilo-Flumen OPTI-TR 50-3 ... 120-1, Wilo-Flumen EXCEL-TRE 50-3 ... 90-2 • Ed.01/2022-07
47
OPTI-TR 50-3 ...
EXCEL-TRE 50-3 ...
OPTI-TR 60-3 ...
EXCEL-TRE 60-3 ...
OPTI-TR 80-3 ...
OPTI-TR 90-2 ...
EXCEL-TRE 90-2 ...
OPTI-TR 120-1 ...
Pre-chamber (external pencil electrode)
o
o
o
o
o
o
o
o
With FM approval
Motor winding: Temperature limiter
•
•
•
•
•
•
•
•
Motor winding: Temperature controller and
limiter
o
o
o
o
o
o
o
o
Pre-chamber (external pencil electrode)
•
•
•
•
•
•
•
•
With CSA Ex rating
Motor winding: Temperature limiter
•
•
•
•
•
•
•
•
Motor winding: Temperature controller and
limiter
o
o
o
o
o
o
o
o
Pre-chamber (external pencil electrode)
o
o
o
o
o
o
o
o
Key
− = not possible, o = optional, • = standard
13.3.4.1 Monitoring of motor winding
DANGER
Risk of explosion due to overheating of the motor!
If the thermal motor monitoring is connected incorrectly there is a risk of
explosion due to overheating of the motor!
• Thermal motor monitoring deactivation must take place with a react-
ivation lock!
Reactivation must only be possible if an unlock button has been
manually actuated!
The threshold value for thermal motor monitoring is determined by the built-in sensor. De-
pending on the version of the thermal motor monitoring, the following triggering status
must arise:
•
Temperature limiter (1 temperature circuit)
If the threshold value is reached, deactivation must take place
with a reactivation lock
!
•
Temperature control (2 temperature circuits)
–
Deactivation with automatic reactivation can occur if the low temperature threshold
is reached.
CAUTION! Motor damage due to overheating! If automatic reactivation takes
place, comply with the specifications for max. switching frequency and switching
break!
–
If the high temperature threshold is reached, deactivation must take place
with a re-
activation lock
!
•
Connect thermal motor monitoring via an Ex-approved evaluation relay (e.g. “CM-
MSS”).
•
If a frequency converter is used, connect the thermal motor monitoring to the Safe
Torque Off (STO). Deactivation on hardware side is thus ensured.
13.3.4.2 Pre-chamber monitoring (external
electrode)
•
Connect the external pencil electrode via an Ex-rated evaluation relay! Relay “XR-4…” is
recommended for this.
The threshold is 30 kOhm.
•
The connection must be made using an intrinsically safe circuit!
13.3.4.3 Frequency converter operation
•
Converter type: Pulse-width modulation
•
Min./max. frequency during continuous duty:
–
Asynchronous motors: 30 Hz up to rated frequency (50 Hz or 60 Hz)
