Danfoss VACON 1000, Operating Manual

Page: 90 / 144

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8.
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A Fiber optic connectors
B Interconnection busbars
C Input terminals
D Bracket
E Guide rail
9.8.3 Reforming the Power Cell Capacitors
If a stored power cell has not been energized in the last 1 year, the electrolytic capacitors must be reformed. The reforming can be
done with an AC or DC supply.
9.8.3.1 Reforming with an AC Supply
Required equipment:
Three-phase voltage regulator, 0–750 V AC, ≥500 VA
MCB, ≥380 V AC (460 V AC), ≥20 A
C A U T I O N
During the reforming, observe whether there is any abnormal phenomenon. If there is anything abnormal, open the MCB
immediately.
Make sure that the wiring for the reforming is done correctly.
Check that the power cell fuses are OK.
If there still are problems, contact Danfoss for assistance.
Procedure
Isolate the power cell from earth ground and separate it from personnel. Make sure that no wires are connected to the
power cell output.
Connect the wires as shown in
Illustration 82 . Install the MCB between the AC supply and the voltage regulator. Connect
the voltage regulator secondary winding to the power cell 3-phase input.
Voltage
regulator
Power
cell
MCB Power
supply
380 V AC
(460 V AC)
e3
0b
i7
44
.1
0
Illustration 82: AC Supply Wiring Diagram
Close the MCB. Turn on the voltage regulator, and bring up the input voltage slowly to 30% of the power cell nominal
voltage (690 V AC). Maintain 30% voltage for 5 minutes.
5 min
10 min
15 min
15 min
t (min)
30%
50%
80%
100%
V (%)
0
e3
0b
i7
45
.1
0
Illustration 83: Reforming Process Diagram
Slowly increase the regulator input voltage to 50%. Maintain the voltage for 10 minutes.
Slowly increase the regulator input voltage to 80%. Maintain the voltage for 15 minutes.
Slowly increase the regulator input voltage to 100%. Maintain the voltage for 15 minutes.
Once the process is complete, decrease the voltage source to zero and open the MCB.
Disconnect the voltage regulator from power cell and AC supply.
AQ363633621020en-000201 / 172F3117 90 | Danfoss A/S © 2021.06
Maintenance
VACON® 1000
Operating Guide