3 Start Up and Functional Testing
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 same conduit, there is potential for leakage current to
charge capacitors within the frequency converter, even
when disconnected from mains 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 frequency converter
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 frequency
converter as well as the motor.
6. Inspect the frequency converter 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
frequency converter and motor.
Start Up and Functional Tes...
VLT
®
AutomationDrive Operating
Instructions
MG.33.AJ.02 - VLT
®
is a registered Danfoss trademark 21
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