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
®
HVAC Drive Operating Instructions
MG11AI02 - VLT
®
is a registered Danfoss trademark
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