2 Safety
2.1 Safety Note
WARNING
The voltage of the frequency converter is dangerous
whenever connected to mains. Incorrect installation of
the motor, frequency converter or fieldbus may cause
damage to the equipment, serious personal injury or
death. Consequently, the instructions in this manual, as
well as national and local rules and safety regulations,
must be complied with.
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.
2. The [STOP/RESET] key on the control panel of the
frequency converter 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 set by
parameter 1-90 Motor Thermal Protection. If this
function is desired, set parameter 1-90 Motor
Thermal Protection to data value [4] ETR trip
(default value) or data value [5] ETR warning.
Note: 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.
7. Note that the frequency converter has voltage
inputs other 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.
NOTICE
Installation at high altitude:
380 - 480 V: At altitudes above 3,000 m, contact Danfoss
regarding PELV.
525 - 690 V: At altitudes above 2,000 m, contact Danfoss
regarding PELV.
Warning against Unintended Start
1. The motor can be stopped with digital
commands, bus commands, references or a local
stop, while the frequency converter is connected
to mains. To avoid personal injury, these stop
functions are not sufficient to ensure that no
unintended start occurs.
2. While parameters are being changed, the motor
may start. Consequently, always press [RESET];
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
Warning:
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from mains.
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.
2.1.1
General Warning
WARNING
Warning:
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from mains.
Also make sure that other voltage inputs have been
disconnected, (linkage of DC intermediate circuit), as well
as the motor connection for kinetic back-up.
Before touching any potentially live parts of the
frequency converter, wait at least as follows: Be aware
that there may be high voltage on the DC link even
when the Control Card LEDs are turned off. A red LED is
mounted on a circuit board inside the frequency
converter to indicate the DC bus voltage. The red LED
stays lit until the DC link is 50 V DC or lower.
Safety VLT HVAC Drive FC 102 Operating Instructions
6 MG11F402 - Rev. 2013-12-16
22
