out. Check that the mains supply has been
disconnected and that the necessary time has
elapsed before removing motor and mains supply
plugs. For information about the discharge time,
see Table 1.3.
2. [O] does not disconnect the mains supply and
must not be used as a safety switch.
3. Ground the equipment properly, protect the user
against supply voltage, and protect the motor
against overload in accordance with applicable
national and local regulations.
4. The ground leakage current exceeds 3.5 mA.
Ensure the correct grounding of the equipment
by a certied electrical installer.
5. Do not remove the plugs for the motor and
mains supply while the frequency converter is
connected to mains. Check that the mains supply
has been disconnected and that the necessary
time has elapsed before removing motor and
mains plugs.
6. The frequency converter has more voltage
sources than L1, L2, and L3, when load sharing
(linking of DC intermediate circuit) or external 24
V DC is installed. Check that all voltage sources
have been disconnected and that the necessary
time has elapsed before commencing repair work.
For information about the discharge time, see
Table 1.3.
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 serial bus 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 [O/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. Failure to wait the specied
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 power 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 specied in Table 1.3.
Voltage [V] Minimum waiting time (minutes)
4 7 15
200–240 0.25–3.7 kW 5.5–37 kW
380–500 0.25–7.5 kW 11–75 kW
525–600 0.75–7.5 kW 11–75 kW
525–690 1.5–7.5 kW 11–75 kW
High voltage can be present even when the warning indicator
lights are o.
Table 1.3 Discharge Time
NOTICE
When using the Safe Torque O, always follow the
instructions in VLT
®
Frequency Converters - Safe Torque
O Operating Instructions.
NOTICE
Control signals from, or internally within, the frequency
converter may in rare cases be activated in error, be
delayed, or fail to occur entirely. When used in situations
where safety is critical, for example, when controlling the
electromagnetic brake function of a hoist application,
these control signals must not be relied on exclusively.
NOTICE
Hazardous situations must be identied by the machine
builder/integrator who is responsible for taking
necessary preventive means into consideration. More
monitoring and protective devices may be included,
always according to valid national safety regulations, for
example, law on mechanical tools, regulations for the
prevention of accidents.
Introduction
VLT
®
AutomationDrive FC 301/302
6 Danfoss A/S © 05/2015 All rights reserved. MG33MK02
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