Special Test Equipment; Split Bus Power Supply; Overview; Split Bus Power Supply Diagrams - Danfoss VLT FC Series Service Manual

Special Test Equipment

9 Special Test Equipment
Special test tools have been developed to aid in troubleshooting Danfoss products. The tools are required to perform some
of the testing procedures outlined in this guide. The following test equipment described in this section is available from
Danfoss.
•
Split bus power supply (p/n 130B3146)
•
Parallel drive module service kit (p/n 176F3745)
•
Signal test board (p/n 176F8437)

9.1 Split Bus Power Supply

9.1.1 Overview

In split bus mode, the DC bus is split into 2 parts. One part powers the SMPS on the power card, allowing the various logic
circuits to be tested without the risk of damaging the power components.
The other part can be used to provide low voltage power to the DC capacitors and output IGBTs for test purposes. A low
voltage supply connected to the DC bus allows safe testing of the output.

9.1.2 Split Bus Power Supply Diagrams

9 9
Illustration 9.1 Connection at Normal Condition
120
®
VLT FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
POWER CARD
SMPS
DC Bus Connector (MK902)
Danfoss A/S © 02/2019 All rights reserved.
Split Bus Connector (MK901)
MG94A502