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Motor compartment/sealing chamber
Pre-chamber (external pencil electrode)
Motor winding: Temperature limiter
Motor winding: Temperature controller and lim-
iter
6.5.4.1
Motor compartment/sealing
chamber monitoring
6.5.4.2
Monitoring the motor winding
26
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 an reactivation
lock! It must only be possible to restart the unit when the unlock key has been actu-
ated 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 approval:
o
o
o
o
o
o
•
•
•
o
o
o
Legend
− = 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.
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
21
High temperature connection
20
Center terminal
22
Low temperature connection
o
o
o
o
o
o
•
•
•
o
o
o
o
o
•
o
WILO SE 2021-10
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