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 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...
VLT
®
Refrigeration Drive Instruction Manual
MG16J122 - VLT
®
is a registered Danfoss trademark
3-1
3
3
