Maintenance; Fault Tracing - ABB ACS880 Series User Manual

38 ATEX-certified motor thermal protection function with Pt100 relays (+L514+Q971)
Action
Checks and settings with no voltage connected
Stop the drive and do the steps in section
work.
Make sure that the classification of the motor thermal protection function corresponds to the Ex classi-
fication of the environment and the Ex motor.
The motor manufacturer selects the Pt100 sensors for the motor temperature measurement. Make
sure that the temperature trip levels match those of the Pt100 relay and set the relay accordingly.
Make sure that the installation of Pt100 sensors complies with the requirements for the applicable type
of protection. See section
Make sure that the wires are connected to the correct terminals and that the terminal connections are
tightened.
Set the trip level of the Pt100 relay. For example, for temperature class T3 the values are:
• 120 ... 140 °C when only tripping is used
• alarm 120 ... 140 °C and trip 130 ... 150 °C when both alarm and trip are used.
Set the temperatures according to the temperature class of the motor.
To modify the settings of the relay, you need a programming tool. See the technical data for ordering
information.
Make sure that the other settings of the relay are correct.
Settings with voltage connected
If necessary, set the applicable parameters. See chapter
If necessary, configure the motor overtemperature indication message. See section
ature indication (page 42).
Acceptance test procedure
To do a test of the wire break monitoring, disconnect the sensor circuit.
Expected outcome: Fault trip (the applicable LED lights). Drive STO is activated.
Make sure that the correct indications are activated.
With the relay(s) both in tripped and in reset state, try to start the drive.
The drive must not start before the drive (and FSO) faults are reset.
Fill in and sign the acceptance test report which verifies that the safety function is safe and accepted
to operation.

Maintenance

After the operation of the safety circuit has been verified at start-up, the circuit requires a
periodic proof test at least every two years.
If you change any wirings or components related to the motor thermal protection function
after the start-up, repeat the procedure given in section
test (page 37).

Fault tracing

For the warning and fault messages generated by the drive, see the drive firmware manual.
For the fault indication LEDs of the relays, see section
For the status LEDs of the FSO module, see the FSO module user's manual.
Electrical safety precautions (page 11)
Wiring (page 35).
before you start the
Parameter settings (page
Start-up and acceptance
Pt100 relays (page
41).
Motor overtemper-
34).