Danfoss VLT Ea4, Operating Manual

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5.5 Control Shelf Connections
The control shelf is preassembled. However, verify its various connections against the connection diagram. Illustration 12 shows the
various control shelf connections.
N O T I C E
CONNECTION SEQUENCE
If the connections are not made in the correct order, the drive modules do not function.
Check that the 44-pin ribbon cable is connected to the MDCIC and the control card.
Check that the STO jumper connection is between the 12th and 37th pins.
Check that the 44-pin ribbon cables are connected to the MDCIC in the correct order:
2 drive modules Connect ribbon cables to inverter 1 and then inverter 2. Do not connect inverter terminals 3 and 4.
4 drive modules Connect ribbon cables to inverter 1, inverter 2, inverter 3, and then inverter 4.
Scaling card position
Place the corresponding current scaling card on each respective connector.
For systems with 2 drive modules, connect inverter 1 and then inverter 2. Do not connect inverter terminals 3 and 4.
For systems with 4 drive modules, Inverter 1, Inverter 2, Inverter 3, and Inverter 4.
Do not reverse the current scaling card. Check that the PCB spacer is fixed on the MDCIC board.
Ensure correct installation of the STO relay and the supply on the DIN rail.
Make more checks to ensure that the wiring of the fuse microswitches and the BRF jumpers are properly routed.
Check that all the screws on the PCBs are secure.
To ensure proper EMC protection, verify that the MDCIC plate is properly attached to the control shelf assembly.
AQ434333248451en-000101 / 130R1286 | 25 Danfoss A/S © 2023.01
Electrical Installation
VLT Ea4 Parallel Drive Modules
Operating Guide