The sensor consists of a plate capacitor that is
immersed in the oil and measures the electronic
circuit, emitting a 4-20 mA proportional current signal.
Check the WIO sensor regularly.
More detailed information can be found in the
installation and operation instructions, 96591899, or
in Grundfos Product Center at www.grundfos.com.
6. Starting up the product
The pump can be started either direct-on-line (DOL)
or star-delta (Y/D). The selection of starting method
depends on usage and main supply conditions.
In case of star-delta starting, keep the
switching transient time at a minimum to
avoid high transient torques.
Use a time relay with a switching time of maximum 50
minutes or according to the manufacturer's
specifications.
V1 W1
U1
PE
V2
U2
W2
PE
L1
D
M
L3
L2
3
TM051638
Direct-on-line starting
V1 W1
U1
PE
V2
U2
W2
PE
L1
D
M
L3
L2
3
TM051639
Star-delta starting
Pos. Description
D
Control cable
Related information
27
English (GB)
Summary of Contents for ST-55-520
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