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Pumps installed in potentially explosive atmosphere
must always be filled with the liquid to be pumped.
An additional level switch must be installed to ensure
that the pump is stopped in case the stop level switch
is not operating.
4.5 Thermal switches
Three bimetallic thermal switches are built into the stator wind-
ings, and a contact will open in case of overtemperature, i.e.
150°C.
The supply voltage to the thermal switches must be 12-230 VAC.
The thermal switches are connected to the monitoring cable, see
section 6. Electrical connection, and must be connected to the
safety circuit of the separate pump controller.
Note: The motor starter of the pump controller must include a cir-
cuit which automatically disconnects the electricity supply in case
the protective circuit for the pump is opened.
The installer/user should provide an automatic device
which disconnets the electricity supply in case the
thermal switches or the moisture switches are not
operating.
4.6 Moisture switches
Non-explosion-proof pumps have one moisture switch, which is
fitted in the chamber below the motor top cover.
Explosion-proof pumps have two moisture switches connected
in series, which are fitted in the chamber below the motor top
cover.
The moisture switch is non-reversing and must be replaced after
use.
The moisture switches are connected in series with the thermal
switches and connected to the monitoring cable, see section
6. Electrical connection, and must be connected to the safety cir-
cuit of the separate pump controller.
Note: The motor starter of the pump controller must include a cir-
cuit which automatically disconnects the electricity supply in case
the protective circuit for the pump is opened.
4.7 WIO sensor
The WIO sensor is available as an accessory for pumps with
motor sizes of 5.5 to 21 kW.
The sensor measures the water content in the oil chamber.
The sensor consists of a plate capacitor which is immersed in the
oil and measures the electronic circuit, emitting a 4-20 mA pro-
portional current signal. Connect the WIO sensor as described in
the instruction for the WIO sensor (96591899).
4.8 Fitting the WIO sensor
The WIO sensor is to be fitted in the filling hole of the oil chamber
instead of the oil screw.
1. Remove the oil screw.
2. Push the sensor into the oil filling hole.
3. Push the sensor to a suitable depth in the oil chamber without
letting it touch the rotating parts, but so deep that the sensor is
completely covered by the oil. Recommended inserting depths
for different pump types appear from the table below.
4. Screw the bush into the thread for the oil screw.
Note: Before refitting after oil change, the WIO sensor must be
cleaned with white spirit (mineral turpentine).
L
Fig. 8
Dimensions of WIO sensor
Motor size
5.5 - 12.5 kW
13.5 - 21 kW
5. Electrical data
Input voltage:
12 - 24 VDC
Output current:
3.4 - 22 mA
Power consumption:
0.6 W
Ambient temperature: 0 to 70°C
5.1 Sensor signals
0- 20% water in oil
4 - 20 mA =
Accuracy better than 2%
Warning:
22 mA
=
Water content far outside measuring range
Alarm:
3.5 mA
=
Air in the oil chamber
Note: The sensor signal is only valid when oil and water is mixed
(when the pump is running).
6. Electrical connection
The electrical connection should be carried out in accordance
with local regulations.
The supply voltage and frequency are marked on the pump
nameplate.
The voltage tolerance must be within ±10% of the rated voltage.
Make sure that the motor is suitable for the electricity supply
available at the installation site.
The pump must be connected to an external mains
switch with a contact separation of at least 3 mm in
each pole.
The pump must be connected to a motor starter.
The wiring diagrams for direct-on-line starting and star-delta
starting are shown in fig. 9 and fig. 10, respectively.
P1 and P2 are connected in series with the thermal switches and
the moisture switches.
P2 P1
L1
Direct-on-line
starting
W2
U1
Fig. 9
Wiring diagrams for direct-on-line starting
P2
P1
Star-delta
starting
U1
Fig. 10 Wiring diagrams for star-delta starting
Inserting depths
L [mm]
80
90
L2
L3
PE
U2
V2
V1 W1
PE
M
3
L1
L2
L3
PE
W2
U2
V2
V1 W1
PE
M
3
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