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VACON® 1000
Operating Guide
9 Maintenance
9.1 Safety
Only authorized trained personnel can conduct service on the VACON® 1000 medium-voltage drive.
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Do not conduct any service, spare parts replacements, or other related operations which are not described in this manual.
Do not revise the system software or connect other equipment with the drive. If changes are required, contact Danfoss.
Do not modify or scratch the labels and markings of the drive, as these are provided for the safety of the users and for the use
of the product.
SHOCK HAZARD FROM DC LINK OR EXTERNAL SOURCE
The terminal connections and the components of the drive can be live several minutes after the drive is disconnected from the
mains and the motor has stopped. The load side of the drive can also generate voltage. A contact with this voltage can lead to
death or serious injury.
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Do not do touch the main circuit of the drive or the motor before the system is powered off and grounded.
Disconnect the drive from the mains and make sure that the motor has stopped.
Disconnect the motor.
Lock out and tag out the power source to the drive.
Make sure that no external source generates unintended voltage during work.
Ground the drive for work.
Wait 15 minutes for the DC-link capacitors to discharge fully before opening the cabinet door or the cover of the AC drive.
Use a measuring device to make sure that there is no voltage.
SHOCK HAZARD
Output voltage detection signals are wired from the voltage divider board to the AD board in the control unit. If any of these
wires are disconnected while MV power is on, a transient high voltage is generated.
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Do not disconnect any wires from the AD board terminals while MV power is on.
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More than one disconnect switch can be required to de-energize the equipment before maintenance.
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Low-voltage fuses that are accessible with the control transformer can be energized. Cut off the supply to the control transform-
er before replacing the fuses.
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There are bulk DC-link capacitors in the drive, which must be discharged to a level below 50 V DC for safe maintenance work.
•
The socket in the control cabinet is only for maintaining or repairing equipment. The current rating is 10 A. Any equipment with
rated current larger than 10 A is prohibited. This equipment does not provide isolation. Separate isolating means are required.
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The isolating means listed in
Danfoss A/S © 2021.06
C A U T I O N
D A N G E R
W A R N I N G
Table 9
or equivalent can be used.
Maintenance
AQ363633621020en-000201 / 172F3117 | 79
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