Composite WPC Boards really do not need heavy maintenance procedures; however, they need to be regularly cleaned with usual housekeeping methods for them to last long. Take extra care of them to keep them looking good and to make them more durable. H
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Maintenance Note
ABB Automation Products
ACS600 Main Circuit Control Boards
ABB Oy, Product Support
DOCMNACS60029
Department
Date
Author
Checked / Approved
Revision
Page
TLC
27.06.2006
Ari Niskanen
Kari Rusanen
C
1 (3)
9 Years Preventive Maintenance FUNCTIONAL DESCRIPTION:
The NGDR-xx, NRED-61, NXPP-xx, NINT-xx and flat cables are the parts of the control circuits for power plate modules. The logic circuits produce gate control pulses for IGBTs and ensure that the two devices associated with a single output phase are not gated on simultaneously. REASONS FOR THE CHANGE:
NGDR-xx boards The gate driver boards have ageing components like electrolytic capacitors .The estimated lifetime of the electrolytic electrolytic capacitors is about 90 000 hours. hours. Our recommendation is to change NGDR-xx boards every 9 years to avoid the risk of destroying the PowerPlate components due to weak or wrong control pulses from an aged component.
Picture 1. Leaked electrolytic capacitors on NGDR board
. e c i t o n t u o h t i w e g n a h c o t t c e j b u s s n o i t a c i f i c e p S
Maintenance Note
ABB Automation Products
ACS600 Main Circuit Control Boards
ABB Oy, Product Support
DOCMNACS60029
Department
Date
Author
Checked / Approved
Revision
Page
TLC
27.06.2006
Ari Niskanen
Kari Rusanen
C
2 (3)
NRED-61 adapters (only 690 VAC units) NRED-61 is thick-film hybrid and it is used as a voltage adapter between the DC link and the power supply.
Picture 2. NRED-61 adapter Improper operation of the adapter has been every now and then the reason for power supply failures especially after over voltages in the dc link. We recommend replacing NRED-61 adapters every 9 years to avoid the risk of power supply failures. NXPP-xx, NINT-xx boards and flat cables A set of NXPP-xx/NINT-xx /flat cable is used for a large amount of signaling.
We recommend changing the set of NXPP-xx/NINT-xx/ flat cable every 9 years to avoid the risk of random type of signaling errors especially in corrosive environment.
THE RESULTING EFFECT:
If the control boards do not work properly, there is a very high risk of IGBT damages in the inverter units because of: 1. Wrong timing of control pulses. 2. Low or short control pulses. 3. Power supply failures 4. Random type of signaling errors
Picture 5. NGDR control pulses specified characteristic curve (left) and degraded waveform (right). WHERE USED:
