Wiring Diagram - Wilo Rexa PRO Notice De Montage Et De Mise En Service

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6.5.5 Monitoring equipment connection
6.5.5.1 Monitoring of motor compart-
ment (P 13 motor only)
6.5.5.2 Monitoring of motor winding
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Installation and electrical connection
Refer to the enclosed connection diagram for details regarding the connection and in-
stallation of the monitoring devices. Electrical connection must always be carried out
by a qualified electrician!
NOTICE! The individual wires are designated according to the connection diagram.
Do not cut the wires! There is no additional assignment between the wiring diagram
and connection diagram.
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 monitoring devices:
Internal monitoring devices
Motor compartment
Motor winding: Temperature limiter
(1-circuit temperature monitoring)
Motor winding: Temperature controller
(2-circuit temperature monitoring)
External monitoring devices
Sealing chamber
Key: - = not available/possible, o = optional, • = as standard
All the monitoring devices fitted must always be connected!
Connect the electrodes via an evaluation relay. Relay "NIV 101/A" is recommended for
this. The threshold is 30 kOhm.

Wiring diagram

Electrode connection
DK
The system must be deactivated when the threshold is reached!
With bimetallic strips
Directly connect bimetallic strips 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
High temperature connection
21
Centre terminal
20
Low temperature connection
22
P 13 P 17
• o
• o
o •
o o
WILO SE 2019-02