Xylem HV 1.1 - 1.2 - Manual (Page 19)

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6.2 Electric installation and wiring
6.2.1 Means of protection
Ask your power supply company which means of protection are required.
Applicable: AC and DC current-operated circuit breaker (FI), TN systems, protective
circuits.
When using a FI protection switch, make sure that it also releases in the event of
a DC fault, use for each Hydrovar a separate FI-switch!
6.2.2 Wiring the Hydrovar to the motor
Remove the 3 screws holding the top of the Hydrovar. Carefully lift the top, loose the earth
screw and put the Hydrovar cover aside.
Now you can see the 2 main parts
(1) control card with all terminals for the control signals and the RS485
interface
(2) main card with all power components and terminals for power supply
and motor
Note:
All installations and maintenance MUST be performed by
trained and qualified personal with proper tools!!
Warning:
In case of a failure, disconnect and lockout electrical power and wait
five minutes for capacitor discharge before servicing the Hydrovar.
Otherwise it can cause shock, burns, or death.