en – Original instructions
29
5 Operation
In case of co-existance of two or more of the following conditions:
•
high ambient temperature
•
high water temperature
•
duty points insisting on unit maximum power
•
persisting undervoltage of mains,
may jeopardise the life of the unit, and/or derating may occur: for further information contact
Xylem or the Authorised Distributor.
5.1 Wait times
WARNING: Electrical hazard
Contact with electric components may cause death, even after the unit has been switched off.
Before any interventions on the unit, the network voltage and any other input voltages must be
disconnected for the minimum time indicated in the table.
Mode (power supply)
Minimum waiting times (min)
Single-phase
4
Three-phase
5
WARNING: Electrical hazard
Frequency converters contain DC-link capacitors that can remain charged even when the
frequency converter is not powered.
To avoid electrical hazards:
•
Disconnect the AC power supply
•
Disconnect all types of permanent magnet motors
•
Disconnect all DC-link remote power supplies, including the battery backups, the
Uninterrupted Power Supply units and the DC-link connections to other frequency converters
•
Wait for the capacitors to discharge completely before carrying out any maintenance or
repairs; see the table above for the waiting times
