380 Maintenance and hardware diagnostics
Capacitors
Reforming the capacitors
The capacitors must be reformed if the drive has been stored for a year. See section
Type designation label on page 26 for how to find out the manufacturing time from the
serial number. For information on reforming the capacitors, refer to Guide for
Capacitor Reforming in ACS50, ACS55, ACS150, ACS310, ACS320, ACS350,
ACS550 and ACH550 (3AFE68735190 [English]), available on the Internet (go to
http://www.abb.com
and enter the code in the Search field).
Power connections
WARNING! Obey the safety instructions. See chapter Safety on page 15. If
you ignore the safety instructions, injury or death can occur. If you are not a
qualified electrician, do not do electrical work.
1. Stop the drive and disconnect it from the power line. Wait for five minutes to let the
drive DC capacitors discharge. Make sure that there is no voltage present.
Measure by a multimeter (impedance at least 1 Mohm) the voltage between the
input terminals and ground and the output terminals and ground.
2. Check the tightness of the power cable connections. Use the tightening torques
given in section Terminal and lead-through data for the power cables on page
394.
3. Restore power.
Control panel
Cleaning the control panel
Use a soft damp cloth to clean the control panel. Avoid harsh cleaners which could
scratch the display window.
Changing the battery in the Assistant control panel
A battery is only used in Assistant control panels that have the clock function
available and enabled. The battery keeps the clock operating in memory during
power interruptions.
The expected life for the battery is greater than ten years. To remove the battery, use
a coin to rotate the battery holder on the back of the control panel. Replace the
battery with type CR2032.
Note: The battery is NOT required for any control panel or drive functions, except the
clock.
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