Installation and electrical connection
en
Installation and operating instructions Wilo-EMU TR/TRE 212 ... 326-3
25
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!
Approval according to
TR 212...
TR 216...
TRE 216...
TR 221...
TRE 221...
TR 226-3...
TRE 226-3...
TRE 312...
TR 316...
TRE 316...
TR 321...
TRE 321...
TR 326-3...
TRE 326-3...
ATEX
o
o
o
o
o
o
o
o
o
o
o
o
o
o
FM
o
o
o
o
o
o
o
o
o
o
o
o
o
o
CSA-Ex
o
o
−
o
−
o
−
−
o
−
o
−
o
−
Legend
− = not available/possible, o = optional, • = standard
6.5.4.1
Motor compartment/sealing
chamber monitoring
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!
6.5.4.2
Monitoring of motor winding
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
20
Centre terminal
22
Low temperature connection
With PTC sensor
Connect the PTC sensor via an evaluation relay. "CM-MSS" relay is recommended for
this purpose.
PTC sensor wiring diagram
Temperature limiter
10, 11
PTC sensor connection
Temperature controller and limiter
