• Make sure that the voltage between the drive output terminals (T1/U, T2/V,
T3/W) and the grounding (PE) busbar is zero.
Important! Repeat the measurement also with the DC voltage setting of the
tester. Measure between each phase and ground. There is a risk of dangerous
DC voltage charging due to leakage capacitances of the motor circuit. This
voltage can remain charged for a long time after the drive power-off. The
measurement discharges the voltage.
• Make sure that the voltage between the drive DC busbars and the grounding
(PE) busbar is zero.
6. Install temporary grounding as required by the local regulations.
7. Ask for a permit to work from the person in control of the electrical installation
work.
￭
Additional instructions and notes
WARNING!
Obey these instructions. If you ignore them, injury or death, or damage to the
equipment can occur.
If you are not a qualified electrical professional, do not do installation or
maintenance work.
• Keep the cabinet doors closed when the drive is powered. With the doors open,
a risk of a potentially fatal electric shock, arc flash or high-energy arc blast exists.
• Make sure that the electrical power network, motor/generator, and environmental
conditions agree with the drive data.
• Do not do insulation or voltage withstand tests on the drive.
• If you have a cardiac pacemaker or other electronic medical device, keep away
from the area near motor, drive, and the drive power cabling when the drive is in
operation. There are electromagnetic fields present which can interfere with the
function of such devices. This can cause a health hazard.
• ABB does not recommend attaching the cabinet by arc welding. If you have to,
obey the welding instructions in the drive manuals.
Note:
• When the drive is connected to the input power, the motor cable terminals and
the DC bus are at a dangerous voltage.
The brake circuit, including the brake chopper (option +D150) and brake resistor
(option +D151) are also at a dangerous voltage.
After disconnecting the drive from the input power, these remain at a dangerous
voltage until the intermediate circuit capacitors have discharged.
• External wiring can supply dangerous voltages to the relay outputs of the control
units of the drive.
• The Safe torque off function does not remove the voltage from the main and
auxiliary circuits. The function is not effective against deliberate sabotage or
misuse.
22 Safety instructions
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