3 Start-up and Functional Test
3.1 Pre-start
3.1.1 Safety Inspection
WARNING
HIGH VOLTAGE!
If input and output connections have been connected improperly, there is potential for high voltage on these terminals.
If power leads for multiple motors are improperly run in the same conduit, there is potential for leakage current to
charge capacitors within the adjustable frequency drive, even when disconnected from line power input. For initial
start-up, make no assumptions about power components. Follow pre-start procedures. Failure to follow pre-start
procedures could result in personal injury or damage to equipment.
1. Input power to the unit must be OFF and locked out. Do not rely on the adjustable frequency drive disconnect
switches for input power isolation.
2. Verify that there is no voltage on input terminals L1 (91), L2 (92), and L3 (93), phase-to-phase and phase-to-
ground.
3. Verify that there is no voltage on output terminals 96 (U), 97 (V), and 98 (W), phase-to-phase and phase-to-ground.
4. Confirm continuity of the motor by measuring ohm values on U-V (96-97), V-W (97-98), and W-U (98-96).
5. Check for proper grounding of the adjustable frequency drive as well as the motor.
6. Inspect the adjustable frequency drive for loose connections on terminals.
7. Record the following motor nameplate data: power, voltage, frequency, full load current, and nominal speed. These
values are needed to program motor nameplate data later.
8. Confirm that the supply voltage matches voltage of adjustable frequency drive and motor.
Start-up and Functional Tes... Instruction Manual
30 Danfoss A/S © Rev. 2014-02-10 All rights reserved. MG16E222
33
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