Wilo Rexa CUT Instrucciones De Instalación Y Funcionamiento página 46

English
Temperature sensor and pencil electrode (avail-
able as an option) for sealing chamber control
Before connecting the monitoring devices, these
must be checked with an ohmmeter. The follow-
ing values must be complied with:
• Bimetallic strip: Value = "0" passage
• Pencil electrode: This value must approach
infinity. If the value is low, there is water in the
oil. Also observe the instructions of the option-
al evaluation relay.
5.5.3. AC motor
Fig. 4.: Connection diagram
L Mains connection
N Earth
The single-phase version is equipped with a
shockproof plug.
The connection to the mains is established by
inserting the plug into a socket. If the pump is to
be connected directly to the switchgear, the plug
must be removed and the electrical connection
must be established by a qualified electrician!
The wires of the connection cable are assigned as
follows:
3-wire connection cable
Wire colour
brown (bn)
blue (bu)
green/yellow (gn-ye)
5.5.4. Three-phase AC motor
Fig. 5.: Connection diagram for motor version "S"
L1
L2 Mains connection
L3
Fig. 6.: Connection diagram for motor version "P"
L1
L2 Mains connection
L3
PE Earth
The three-phase current version is supplied with
bare cable ends. The connection to the mains is
made at the switchgear.
Electrical connections may only be made by a
qualified electrician!
46
PE Earth
Terminal
L
N
Earth (PE)
PE Earth
20
Bimetallic strip
21
Leakage detection for
DK
motor compartment
20
Bimetallic strip
21
The wires of the connection cable are assigned as
follows:
6-wire connection cable
Wire number Terminal
1
Temperature monitor for wind-
ing
2
3 U
4 V
5 W
green/yellow (gn-ye) Earth (PE)
7-wire connection cable
Wire number Terminal
1
Temperature monitor for wind-
ing
2
3 U
4 V
5 W
Leakage detection for motor
6
compartment
green/yellow (gn-ye) Earth (PE)
If the pump is fitted with a plug, it is connected to
the mains by inserting the plug into a socket.
5.5.5. Connecting the monitoring devices
RISK of fatal injury due to explosion!
If the monitors are not connected correctly,
there is a risk of fatal injury due to explosion
if used in potentially explosive areas! Al-
ways have the connection carried out by an
electrician. If the pump is used in potentially
explosive areas:
• the temperature monitor must be connected
via an evaluation relay. We recommend the
"CM-MSS" relay for this. The threshold is
already pre-set.
• Deactivation by the temperature limiter
must be conducted with an anti-reactivation
device! Reactivation should only be possible
if the "release button" has been manually
activated!
• The pencil electrode for sealing chamber
control must be connected via an intrinsi-
cally safe circuit with an evaluation relay. We
recommend the "XR-41x" relay for this. The
threshold is 30 kOhm.
• Also note the additional information in the
appendix!
All monitoring devices must be connected at all
times!
Temperature monitoring of the single-phase AC
motor
The temperature monitoring unit is integrat-
ed in the single-phase AC motor and switches
automatically. The monitoring function is always
INSTALLATION
WILO SE 11-2014 V05 DIN A4