Planning the electrical installation
71
Protecting the drive against ground faults
The drive is equipped with an internal ground fault protective function to protect the
unit against ground faults in the motor and motor cable. This is not a personal safety
or a fire protection feature. The ground fault protective function can be disabled with
a parameter, refer to the appropriate Firmware Manual.
Measures for protection in case of direct or indirect contact, such as separation from
the environment by double or reinforced insulation or isolation from the supply
system by a transformer, can be applied.
Residual current device compatibility
The drive is suitable to be used with residual current devices of Type B.
Note: The EMC filter of the drive includes capacitors connected between the main
circuit and the frame. These capacitors and long motor cables increase the ground
leakage current and may cause fault current circuit breakers to function.
Implementing the Emergency stop function
For safety reasons, install the emergency stop devices at each operator control
station and at other operating stations where emergency stop may be needed.
Note: Pressing the stop key ( ) on the control panel of the drive does not generate
an emergency stop of the motor or separate the drive from dangerous potential.
Implementing the Safe Torque Off function
The drive supports the Safe Torque Off function according to standards
EN 61800-5-2:2007; EN 954-1:1997; IEC/EN 60204-1:1997; EN 61508:2002 and
EN 1037:1996.
The Safe Torque Off function disables the control voltage of the power
semiconductors of the drive output stage, thus preventing the inverter from
generating the voltage required to rotate the motor (see diagram below). By using
this function, short-time operations (like cleaning) and/or maintenance work on non-
electrical parts of the machinery can be performed without switching off the power
supply to the drive.
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