70 Guidelines for planning the electrical installation
indication given by motor temperature sensors. The user can tune the thermal model
further by feeding in additional motor and load data.
The most common temperature sensors are:
• motor sizes IEC 180…225: thermal switch, eg, Klixon
• motor sizes IEC 200…250 and larger: PTC or Pt100.
See the firmware manual for more information on the motor thermal protection, and the
connection and use of the temperature sensors.
Protecting the drive against ground faults
The drive is equipped with an internal ground fault protective function to protect the drive
against ground faults in the motor and motor cable in TN (grounded) networks. 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 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 can cause fault current circuit breakers to function.
Connecting drive modules to a common DC system
Do not connect the drive module to a common DC system.
WARNING! The UDC+ and UDC- terminals of the drive module must not be used
for any other than optional external brake chopper connection. Drives connected
to a common DC system will get damaged.
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. You can implement
the emergency stop function using the Safe torque off function of the drive module (see
chapter Safe torque off function on page 217). Design the emergency stop according to
relevant standards.
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
See chapter Safe torque off function on page 217.
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