Danfoss VLT Refrigeration Drive FC 103 Design Manual page 15

Introduction
WARNING
UNINTENDED START
When the frequency converter is connected to AC mains,
DC supply, or load sharing, the motor may start at any
time. Unintended start during programming, service, or
repair work can result in death, serious injury, or
property damage. The motor can start via an external
switch, a fieldbus command, an input reference signal
from the LCP, or after a cleared fault condition.
To prevent unintended motor start:
•
Disconnect the frequency converter from the
mains.
•
Press [Off/Reset] on the LCP before
programming parameters.
•
Completely wire and assemble the frequency
converter, motor, and any driven equipment
before connecting the frequency converter to
AC mains, DC supply, or load sharing.
WARNING
DISCHARGE TIME
The frequency converter contains DC-link capacitors,
which can remain charged even when the frequency
converter is not powered. High voltage may be present
even when the warning LED indicator lights are off.
Failure to wait the specified time after power has been
removed before performing service or repair work, could
result in death or serious injury.
1. Stop the motor.
2. Disconnect AC mains, permanent magnet type
motors, and remote DC-link supplies, including
battery back-ups, UPS, and DC-link connections
to other frequency converters.
3. Wait for the capacitors to discharge fully, before
performing any service or repair work. The
duration of waiting time is specified in Table 1.4.
Voltage [V] Minimum waiting time (minutes)
4
200–240 1.1–3.7 kW
380–480 1.1–7.5 kW
525–600 1.1–7.5 kW
Table 1.4 Discharge Time
MG16G202
Design Guide
WARNING
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground
frequency converter properly can result in death or
serious injury.
•
WARNING
EQUIPMENT HAZARD
Contact with rotating shafts and electrical equipment
can result in death or serious injury.
•
•
•
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.
•
CAUTION
INTERNAL FAILURE HAZARD
An internal failure in the frequency converter can result
in serious injury, when the frequency converter is not
properly closed.
•
15
5.5–45 kW
11–90 kW
11–90 kW
Danfoss A/S © 08/2015 All rights reserved.
Ensure the correct grounding of the equipment
by a certified electrical installer.
Ensure that only trained and qualified personnel
perform installation, start-up, and maintenance.
Ensure that electrical work conforms to national
and local electrical codes.
Follow the procedures in this manual.
Ensure that permanent magnet motors are
blocked to prevent unintended rotation.
Ensure that all safety covers are in place and
securely fastened before applying power.
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