Vfd; Wiring; Start-Up And Test - Carrier 39LA-25 Installation, Start-Up And Service Instructions Manual

VFD

When variable frequency drive (VFD) is factory-installed, it is
wired to the motor and fully tested before shipment. Drive pro-
gramming is also done at the factory, including electronic over-
load, which is programmed for the motor FLA. Refer to Tables 6
and 7.
Open the VFD front cover and the fan section access door to
check for any damage before proceeding.

WIRING

1. Select a suitable location in the bottom of the VFD to connect
field-supplied power source.
2. Remove the appropriate size knockout using a suitable
knockout punch tool. Do NOT use a drill; metal shavings will
damage the drive.
3. Connect the field-supplied conduit to the VFD enclosure.
4. Refer to the wiring diagram supplied with the VFD connect
the line voltage power source to the line voltage terminals
(U1, V1, W1) as shown.
5. Refer to the factory-supplied voltage warning label and verify
that the power source is correct.
6. Connect the ground wire to the grounding lug provided on the
bottom of the VFD.
7. Select another suitable location on the bottom of the VFD to
connect the field-supplied control wiring.
8. Locate and use one of the unused knockouts on the VFD
housing and connect the control wiring conduit. Refer to
Fig. 22 - 24 for field control wiring connections.
NOTE: If a 0 to 10 or 2 to 10 vdc signal is used to control the
drive speed, reset the dipswitch to the voltage or V position.
Verify that the AI switch is set to the voltage position. See
Fig. 25. DO NOT reprogram the drive.

START-UP AND TEST

1. Close and secure the fan access door and the VFD cover.
2. Apply power and allow drive to initialize.
3. If fan is a direct drive type, then ensure VFD has been pro-
grammed with the correct values for parameters 2002 and
2008 to maximum fan speed and maximum VFD output fre-
quency to limit motor speed to the fan maximum.
CAUTION
Failure to ensure parameters 2002 and 2008 are correct can
result in damage to the fan wheel.
4. Verify max fan rpm from label on fan sled.
5. Verify motor Hz and nominal operating speed on motor
nameplate.
6. Calculate the maximum frequency output from the VFD.
Maximum frequency = motor frequency (Hz) * fan maxi-
mum speed (rpm) ÷ motor nominal operating speed (rpm).
7. Verify that parameter 2002 (maximum fan speed) has been
set to match value on the fan label.
8. Select MENU to enter the main menu.
9. Select CHANGED PAR with the UP/DOWN buttons and
select ENTER.
10. Select parameter 2002 and verify it equals the maximum fan
speed.
11. If values are equal, then go to Step 14.
12. If values are not equal, select EDIT, press the UP/DOWN
buttons to match the required value.
13. Select SAVE to store the modified value.
14. Select EXIT to return to the listing of parameters.
15. Select Parameter 2008 and verify it equals the maximum
VFD output frequency.
16. If values are equal, then go to Step 19.
17. If values are not equal, select EDIT, press the UP/DOWN
buttons to match the required value.
18. Select SAVE to store the modified value.
19. Select EXIT to return to the listing of parameters.
20. Select EXIT to return to the main menu.
21. Press the HAND button and verify that the drive operates at
8 Hz.
22. Press Up arrow to increase speed and Down arrow to
decrease speed.
23. Press the Off button and verify that the fan stops.
24. Press the Auto button to operate the drive from the Energy
Management System (EMS) interface. Verify that all VFD
interface functions are working (start/stop, speed controls,
fire/smoke, shutdown, etc.) between the VFD and the EMS.
Refer to Tables 6 and 7 for additional VFD information.
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