Service Manual FCD 300
Release 01/2003
2
Revise 08/01/2003 by DD Service Manager, Steffen Sundbæk
General warning and your safety
General warning
The voltage of the frequency converter is dangerous whenever the converter is connected to mains. Incorrect
fitting of the motor or frequency converter may cause damage to the equipment, serious injury or death.
Consequently, it is essential to comply with the instructions in this manual as well as local and national rules
and safety regulations.
These rules concern your safety
1. The frequency converter must be disconnected from the mains if repair work is to be carried out. Check
that the mains supply has been disconnected and that the prescribed time has passed before removing the
inverter part from the installation.
2. The [STOP/RESET] key on the optional control panel does not disconnect the equipment from mains and
is thus not to be used as a safety switch.
3. The unit must be properly connected to the earth, the user must be protected against the supply voltage
and the motor must be protected against overloading pursuant to prevailing national and local regulations.
4. The earth leakage currents are higher than 3.5 mA.
5.
Protection against motor overload is not included in the factory setting. If this function is required, set
parameter 128
Motor thermal protection
to data value
ETR trip
or data value
ETR warning
. For the North
American market: The ETR functions provide overload protection of the motor, class 20, in accordance
with NEC.
Warning against unintended start
1. The motor can be brought to a stop by means of digital commands, bus commands, references or a local
stop, while the frequency converter is connected to mains. If personal safety considerations make it
necessary to ensure that no unintended start occurs, these stop functions are not sufficient.
2. While parameters are being changed, the motor may start. Consequently, the stop key [STOP/RESET] on
the optional control panel must always be activated; following which data can be modified.
3.
A motor that has been stopped may start if faults occur in the electronics of the frequency converter, or if a
temporary overload or a fault in the supply mains or the motor connection ceases.
Warning:
It can be extremely dangerous to touch the electrical parts even
when the AC line supply has been disconnected.
For FCD 300:
wait at least 4 minutes
.
