
92 Program features
WARNING!
IEC 60664 requires double or reinforced insulation between live
parts and the surface of accessible parts of electrical equipment which are
either non-conductive or conductive but not connected to the protective earth.
To fulfill this requirement, connect a thermistor to the drive’s control terminals using
any of these alternatives:
• Separate the thermistor from live parts of the motor with double reinforced
insulation.
• Protect all circuits connected to the drive’s digital and analog inputs. Protect
against contact, and insulate from other low voltage circuits with basic insulation
(rated for the same voltage level as the drive’s main circuit).
• Use an external thermistor relay. The relay insulation must be rated for the same
voltage level as the drive’s main circuit.
Temperature monitoring using Pt100 sensors
1…3 Pt100 sensors can be connected in series to an analog input and an analog
output.
The analog output feeds a constant excitation current of 9.1 mA through the sensor.
The sensor resistance increases as the motor temperature rises, as does the voltage
over the sensor. The temperature measurement function reads the voltage through
the analog input and converts it into degrees Celsius.
It is possible to adjust the motor temperature supervision limits and select how the
drive reacts when overtemperature is detected.
For the wiring of the sensor, see the
Hardware manual
of the drive.
Settings and diagnostics
Parameter group
(page
Events: -
Automatic fault resets
The drive can automatically reset itself after overcurrent, overvoltage, undervoltage
and external faults. The user can also specify a fault that is automatically reset.
By default, automatic resets are off and must be specifically activated by the user.
WARNING!
Before you activate the function, make sure that no dangerous
situations can occur. The function resets the drive automatically and continues
operation after a fault.
ACS180 FW.book Page 92 Tuesday, March 9, 2021 2:25 PM