Appendix
en
Installation and operating instructions Wilo-EMU KS
241
KS...
KS...Ex
Motor compartment
-
•
Motor winding
-
•
Motor bearings
-
-
Sealing chamber
Internal electrode
-
-
External electrode
o
o
Key: - = not available/possible, o = optional, • = as standard
All the monitoring devices fitted must always be connected!
13.1.4.1 Monitoring of motor compart-
ment
The connection is made as described in the “Electrical connection” section.
13.1.4.2 Monitoring of motor winding
DANGER
Risk of explosion due to overheating of the motor!
If the temperature limiter is connected incorrectly, there is a risk of explosion due to
overheating of the motor! Always connect the temperature limiter to a manual re-
activation lock. This means that a “release button” must be manually activated!
The motor is equipped with a temperature limiter (1-circuit temperature monitoring).
When the threshold is reached, deactivation must occur with a
restart interlock
!
Connection of the thermal motor monitoring
▪ Connect the bimetallic strip via an evaluation relay. Relay “CM-MSS” is recommended
for this. The threshold is preset.
Connection values: max. 250 V(AC), 2.5 A, cos φ = 1
▪ Connect the PTC sensor via an evaluation relay. Relay “CM-MSS” is recommended for
this. The threshold is preset.
13.1.4.3 Sealing chamber monitoring (ex-
ternal 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!
13.1.5
Commissioning
DANGER
Risk of explosion when using non Ex-rated pumps!
Pumps without Ex rating may not be used in potentially explosive areas! There is a
risk of fatal injury due to explosion! Only use pumps which have the appropriate Ex
labelling on the rating plate within potentially explosive areas.
DANGER
Risk of explosion due to flying sparks in the hydraulics!
During operation the hydraulics must be flooded (completely filled with the fluid). If
the volume flow is interrupted or the hydraulics emerges, air cushions can form in
the hydraulics. If this happens, there is a risk of explosion, e.g. flying sparks due to
static charge! Dry-running protection must ensure that the pump is deactivated at
the appropriate level.
DANGER
There is a risk of explosion if dry-running protection is connected incor-
rectly!
If the pump is operated within an explosive atmosphere, the dry-running protection
must have a separate signal transmitter (redundant protection of the level control).
Pump deactivation must be performed with a manual reactivation lock!
