6
Operation and service
Long term storage
28
Operating Instructions Basic Unit – MOVITRAC
®
B
6.4.2
Repair service
Please contact the
SEW Electronics Service if you can not rectify a fault.
Please always specify the unit status code number when you contact the SEW elec-
tronics service so that our service personnel can assist you more effectively.
6.5
Long term storage
If the unit is being stored for a long time, connect it to the mains voltage for at least
5 minutes every 2 years. Else, the unit's service life may be shortened.
Handling electrolytic capacitors after long storage periods
All electrolytic capacitors can be stored deenergized without losing performance for at
least two years. They can be loaded with rated voltage during this period.
After being stored for longer than two years, the connection response to high initial
remaining currents is significant. After storage for two years, installed electrolytic capac-
itors are regenerated after one hour of interference-free operation of the connection
(with maximum rated voltage) and can then be stored again.
Forming Process
SEW-EURODRIVE recommends forming the electrolytic capacitors slowly to avoid
excess gas formation within the capacitor.
If a unit is formed internally, voltage should be conducted via a transformer to enable a
slow and steady increase of voltage. Voltage should first be set at 0 V and then
increased to the first forming voltage.
The following forming levels with respective dwell times are recommended:
• 70 % V
rated_max
: 15 minutes
• 85 % V
rated_max
: 15 minutes
• 100 % V
rated_max
: 1 hour
Please provide the following information when sending the unit in for repair:
Serial number (
Æ
nameplate)
Unit Designation
Short description of application (application, control via terminals or serial)
Connected motor (motor voltage, star or delta connection)
Nature of the error
Accompanying circumstances
Your own presumptions as to what has happened
Unusual events preceding the problem
