VLT
®
AutomationDrive EtherNet/IP
MG.90.J1.02 – VLT is a registered Danfoss trademark
3
Safety Note
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 disconnected and that the necessary time has passed before removing
motor and mains plugs.
2. The [OFF] 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 or grounding 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 par. 1-90 to data value
ETR trip
or data value
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. Please note that 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.
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 [OFF] key 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.
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.
Please take note of discharge times and further safety guidelines from the section: “Safety and
conformity”, in the respective Design Guide (MG.33.Ax.yy).
