Safety Regulations - Danfoss VLT 5000 Operating Instructions Manual

The voltage of the frequency converter is dangerous whenever the equipment is
connected to mains. Incorrect installation of the motor or the frequency converter 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 VLT 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 [STOP/RESET] key on the control panel of the VLT 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 not included in the factory setting. If this function is desired, set
parameter 128 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 VLT 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 VLT 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
repair work is commenced.
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]
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 VLT 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.
Using VLT 5001-5006 220 and 500 V units: wait at least 4 minutes
Using VLT 5008-5500 220 and 500 V units: wait at least 15 minutes
Using VLT 5001-5005 550-600 V units: wait at least 4 minutes
Using VLT 5006-5022 550-600 V units: wait at least 15 minutes
Using VLT 5027-5250 550-600 V units: wait at least 30 minutes
MG.10.N4.02 - VLT is a registered Danfoss trademark
Synchronizing controller
3