ABB ACQ810-04, Hardware Manual, Page: 12 / 144

12 Safety instructions
Safety in installation and maintenance

Electrical safety
These warnings are intended for all who work on the drive, motor cable or motor.
WARNING! Ignoring the following instructions can cause physical injury or
death, or damage to the equipment:
•
Only qualified electricians are allowed to install and maintain the drive.
•
Never work on the drive, motor cable or motor when main power is applied. After
disconnecting the input power, always wait for 5 min to let the intermediate circuit
capacitors discharge before you start working on the drive, motor or motor cable.
Always ensure by measuring with a multimeter (impedance at least 1 Mohm) that:
1. voltage between drive input phases U1, V1 and W1 and the frame is close to 0 V.
2. voltage between terminals UDC+ and UDC- and the frame is close to 0 V (units
with additional DC busbars).
•
Do not work on the control cables when power is applied to the drive or to the
external control circuits. Externally supplied control circuits may cause dangerous
voltages inside the drive even when the main power on the drive is switched off.
•
Do not make any insulation or voltage withstand tests on the drive or drive modules.
•
When reconnecting the motor cable, always check that the phase order is correct.
Note:
•
The motor cable terminals on the drive are at a dangerously high voltage when the
input power is on, regardless of whether the motor is running or not.
•
The DC terminals (UDC+, UDC-) carry a dangerous DC voltage (over 500 V) when
internally connected to the intermediate DC circuit.
•
Depending on the external wiring, dangerous voltages (115 V, 220 V or 230 V) may
be present on the terminals of relay outputs (XRO1 and XRO2) or Safe torque off
(XSTO).
•
The Safe torque off function does not remove the voltage from the main and
auxiliary circuits.