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Operating Guide | VACON® NXS/NXP Air-cooled
SHOCK HAZARD FROM CAPACITORS
The capacitors can be charged even when disconnected. Contact with this voltage can lead to death or serious injury.
If the AC drive or spare capacitors are intended to be stocked, discharge the capacitors before storage. Use a measuring
-
device to make sure that there is no voltage. If in doubt, contact your Danfoss Drives® representative.
Case 1: AC drive which has been non-operational or stocked for over 2 years.
1. Connect the DC supply to LI1 and L2 or the B+/B terminals (DC+ to B+, DC- to B-) of the DC-link or directly to the capacitor
terminals. In the NX AC drives with no B+/B- terminals (FR8–FR9/FI8–FI9), connect the DC supply between 2 input phases (L1 and
L2).
2. Set the current limit maximum to 800 mA.
3. Slowly increase the DC voltage to the nominal DC voltage level of the AC drive (1.35*U
4. Start to reform the capacitors.
The time of reforming depends on the time of storage. See
9
A
8
7
6
5
4
3
2
1
0
0
1
A Storage time (years)
C Reforming time
Illustration 58:
Storage Time and Reforming Time
5. After the reforming operation is done, discharge the capacitors.
Case 2: Spare capacitor which has been stocked for over 2 years.
1. Connect the DC supply to DC+/DC- terminals.
2. Set the current limit maximum to 800 mA.
3. Slowly increase the DC voltage to the capacitor nominal voltage level. See information from component or service documentation.
4. Start to reform the capacitors.
The time of reforming depends on the time of storage. See
5. After the reforming operation is done, discharge the capacitors.
Danfoss A/S © 2020.02
2
3
4
5
D A N G E R
illustration
58.
C
6
7
8
B Reforming time (hours)
illustration
58.
AC).
n
9
B
AQ275638903263en-000301 / DPD00910| 149
Maintenance
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