WARNING
DISCHARGE TIME
The frequency converter contains DC-link capacitors,
which can remain charged even when the frequency
converter is not powered. High voltage can be present
even when the warning LED indicator lights are o.
Failure to wait the specied time after power has been
removed before performing service or repair work can
result in death or serious injury.
•
Stop the motor.
•
Disconnect AC mains and remote DC-link power
supplies, including battery back-ups, UPS, and
DC-link connections to other frequency
converters.
•
Disconnect or lock PM motor.
•
Wait for the capacitors to discharge fully. The
minimum duration of waiting time is specied
in Table 2.1.
•
Before performing any service or repair work,
use an appropriate voltage measuring device to
make sure that the capacitors are fully
discharged.
Voltage Minimum waiting time/power range
20 minutes 30 minutes 40 minutes
380–500 V 90–200 kW
(125–275 hp)
– 250–800 kW
(350–1075 hp)
525–690 37–315 kW (50–
450 hp)
– 355–1200 kW
(500–1600 hp)
Table 2.1 Discharge Time
WARNING
UNEXPECTED ELECTRICAL SHOCK HAZARD
Parts of the VLT
®
Plus Panel can still be powered when
the frequency converter is switched o. Solely removing
the fuses, or switching the mains disconnect do not
switch the VLT
®
Plus Panel o. A contactor is not a safe
disconnection method, when any manipulation in the
panel or at the frequency converter is performed.
•
Always follow the local technical and safety
rules.
•
Do not use contactors for safe disconnect.
•
Always use a voltage meter to make sure that
any parts are voltage-free before touching
them.
•
Access to the VLT
®
Plus Panels for any handling
and operation is allowed for
qualied personnel
only.
WARNING
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground
frequency converter properly can result in death or
serious injury.
•
Ensure the correct grounding of the equipment
by a certied electrical installer.
WARNING
EQUIPMENT HAZARD
Contact with rotating shafts and electrical equipment
can result in death or serious injury.
•
Ensure that only trained and qualied personnel
perform installation, start-up, and maintenance.
•
Ensure that electrical work conforms to national
and local electrical codes.
•
Follow the procedures in this manual.
WARNING
UNINTENDED MOTOR ROTATION
WINDMILLING
Unintended rotation of permanent magnet motors
creates voltage and can charge the unit, resulting in
death, serious injury, or equipment damage.
•
Ensure that permanent magnet motors are
blocked to prevent unintended rotation.
CAUTION
INTERNAL FAILURE HAZARD
An internal failure in the frequency converter can result
in serious injury, when the frequency converter is not
properly closed.
•
Ensure that all safety covers are in place and
securely fastened before applying power.
To run STO, additional wiring for the frequency converter is
required. Refer to VLT
®
Frequency Converters Safe Torque O
Operating Instructions for further information.
Safety Installation Guide
MG13B102 Danfoss A/S © 09/2015 All rights reserved. 9
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