440L-AM1251350 A-B  Central Control Unit

Disconnecting MOVs To help prevent drive damage, disconnect the MOVs connected to ground if the drive is installed on an ungrounded distribution system (IT mains) where the line-to-ground voltages on any phase could exceed 125% of the nominal line-to-line voltage. To disconnect these devices, remove the jumper that is shown in the following diagrams. 1. Turn the screw counterclockwise to loosen. 2. Pull the jumper completely out of the drive chassis. 3. Tighten the screw to keep it in place

Input Power Conditioning The drive is suitable for direct connection to input power within the rated voltage of the drive. See Input Power Conditions on page 20. Listed in the Input Power Conditions table below are certain input power conditions that can cause component damage or reduction in product life. If any of these conditions exist, install one of the devices that are listed under the heading Corrective Action on the line side of the drive.

General Grounding Requirements The drive safety ground - (PE) must be connected to the system ground. Ground impedance must conform to the requirements of national and local industrial safety regulations and/or electrical codes. Check the integrity of all ground connections periodically.

Shield Termination - SHLD Either of the safety ground terminals that are on the power terminal block provide a grounding point for the motor cable shield. The motor cable shield connected to one of these terminals (drive end) should also be connected to the motor frame (motor end). Use a shield terminating or EMI clamp to connect the shield to the safety ground terminal. The earthing plate or conduit box option may be used with a cable clamp for a grounding point for the cable shield. When a shielded cable is used for control and signal wiring, ground the shield at the source end only, not at the drive end. RFI Filter Grounding Using a drive with a filter can result in relatively high ground leakage currents. Therefore, the filter must only be used in installations with grounded AC supply systems and be permanently installed and solidly grounded (bonded) to the building power distribution ground. Verify that the incoming supply neutral is solidly connected (bonded) to the same building power distribution ground. Grounding must not rely on flexible cables and should exclude any form of plug or socket that permits inadvertent disconnection. Some local codes may require redundant ground connections. The integrity of all connections should be periodically checked.

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