Wilo -Flumen EXCEL-TRE 20 Installation And Operating Instructions Manual page 63

Motor compartment
Motor compartment/sealing chamber
Sealing chamber (external pencil electrode)
Motor winding: Temperature limiter
Motor winding: Temperature controller and
limiter
6.5.4.1 Monitoring of motor compart-
ment
6.5.4.2 Motor compartment/sealing
chamber monitoring
6.5.4.3 Monitoring of motor winding
Installation and operating instructions Wilo-Flumen OPTI-TR 20-1, 22, 28-1, 30-1, 40-1, Wilo-Flumen EXCEL-TRE 20, 30, 40
Installation and electrical connection
DANGER
Risk of explosion due to incorrect connection!
If the monitoring devices are not connected correctly, there is a risk of fatal injury
due to explosion in potentially explosive areas! Connection must always be carried
out by a qualified electrician. If used in potentially explosive areas:
• Connect the thermal motor monitoring via an evaluation relay!
• Deactivation by the temperature limiter must be conducted with reactivation
lock! It must only be possible to restart the unit when the unlock key has been
actuated by hand!
• Connect the external electrode (e.g. sealing chamber control) via an evaluation
relay with an intrinsically safe circuit!
• Note the additional information in the chapter on potentially explosive areas
found in the appendix of these installation and operating instructions!
Overview of possible monitoring devices for submersible mixers without Ex rating:
o o −
− − o
o o o
• • •
o o o
Key
− = not possible, o = optional, • = standard
Connect the electrodes via an evaluation relay. Relay "NIV 101/A" is recommended for
this. The threshold is 30 kOhm.
Wiring diagram
DK Electrode connection
The system must be deactivated when the threshold is reached!
Connect the electrodes via an evaluation relay. Relay "NIV 101/A" is recommended for
this. The threshold is 30 kOhm.
Wiring diagram
DK Electrode connection
The system must be deactivated when the threshold is reached!
With bimetallic strips
Connect the bimetallic strips directly to the switchgear or via an evaluation relay.
Connection values: max. 250 V (AC), 2.5 A, cos φ = 1
Wiring diagram for bimetallic strip
Temperature limiter
20, 21 Bimetallic strip connection
Temperature controller and limiter
21 High temperature connection
o − −
− o o
o o o
• • •
o o o
en
− −
o o
o o
• •
o o
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