2 Safety
WARNING
HIGH VOLTAGE
Frequency converters contain high voltage when
connected to AC mains input power. Failure to perform
installation, start-up, and maintenance by qualified
personnel could result in death or serious injury.
•
Installation, start-up, and maintenance must be
performed by qualified personnel only.
Safety regulations
1.
The frequency converter must be disconnected
from mains, if repair work is to be carried out.
Check that the mains supply has been discon-
nected and that the necessary time has passed
before removing motor and mains plugs, see
Discharge Time Table.
2.
The [Off] key does not disconnect the equipment
from mains and is thus not to be used as a safety
switch.
3.
Correct protective earthing of the equipment
must be established, the user must be protected
against supply voltage, and the motor must be
protected against overload in accordance with
applicable 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 desired,
set
1-90 Motor Thermal Protection
[4] ETR
trip or
[3] ETR warning
.
The function is initialised at 1.16 x rated motor current and
rated motor frequency. For the North American market; the
ETR functions provide class 20 motor overload protection
in accordance with NEC.
6.
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 passed before removing motor and
mains plugs, see
Discharge Time Table
.
7.
The frequency converter has more voltage inputs
than L1, L2 and L3, when load sharing (linking of
DC intermediate circuit) and external 24 V DC
have been installed. Check that all voltage inputs
have been disconnected and that the necessary
time has passed before commencing repair work,
see
Discharge Time Table
.
Warning against unintended start
1.
The motor can be brought to a stop with digital
commands, bus commands, references or a local
stop, while the frequency converter is connected
to mains. These stop funcyions are not sufficient
to prevent unintended starts.
2.
While parameters are being changed, the motor
may start. Consequently, [Off] must always be
activated.
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
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from mains.
Voltage [V]
Minimum waiting time (minutes)
4
15
200-240
0.25-3.7 kW
5.5-37 kW
380-480
0.25-7.5 kW
11-75 kW
525-600
0.75-7.5 kW
11-75 kW
525-690
11-75 kW
High voltage may be present even when the warning LED
indicator lights are off.
Table 2.1 Discharge Time
Also make sure that other voltage inputs have been
disconnected, such as external 24 V DC, load sharing
(linkage of DC intermediate circuit), as well as the motor
connection for kinetic back up.
Safety
VLT
®
AutomationDrive FC 302 PROFIBUS Converter Operating Instructions
6
MG34N202 - Rev. 2013-10-15
2
2
