1 Safety
1.1 Safety
WARNING
HIGH VOLTAGE
Frequency converters contain high voltage when
connected to AC mains input power. Qualified personnel
only should perform installation, start up, and
maintenance. Failure to perform installation, start up,
and maintenance by qualified personnel could result in
death or serious injury.
WARNING
UNINTENDED START
When the frequency converter is connected to AC mains,
the motor may start at any time. The frequency
converter, motor, and any driven equipment must be in
operational readiness. Failure to be in operational
readiness when the frequency converter is connected to
AC mains could result in death, serious injury,
equipment, or property damage.
WARNING
DISCHARGE TIME
Frequency converters contain DC-link capacitors that can
remain charged even when the frequency converter is
not powered. To avoid electrical hazards, disconnect AC
mains, any permanent magnet type motors, and any
remote DC-link power supplies, including battery back-
ups, UPS, and DC-link connections to other frequency
converters. Wait for the capacitors to fully discharge
before performing any service or repair work. The
amount of wait time is listed in the Discharge Time table.
Failure to wait the specified time after power has been
removed before doing service or repair could result in
death or serious injury.
Voltage [V] Power range [kW] Minimum waiting time
(minutes)
380-500
160-250 kW* 20
315-710 kW 40
Table 1.1 Discharge Times
*Power ranges are for normal overload operation.
Safety
Operating Instructions
4 Danfoss A/S © Rev. 2014-07-29 All rights reserved. MG37A202
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