Wiring; Start-Up And Test; Vfd With Bypass - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

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 shav-
ings will damage the drive.
3. Connect the field-supplied conduit to the VFD enclo-
sure.
4. Refer to the wiring diagram supplied with the VFD
connect the line voltage power source to the line volt-
age 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. 110 and 111 for field control wiring con-
nections.
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 posi-
tion. Verify that the AI switch is set to the voltage position.
See Fig. 113. DO NOT reprogram the drive.

START-UP AND TEST

1. Close and secure the fan access door and the VFD cov-
er.
2. Apply power and allow drive to initialize.
3. If fan is a direct drive type, then ensure VFD has been
programmed with the correct values for parameters
2002 and 2008 to maximum fan speed and maximum
VFD output frequency 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 mo-
tor nameplate.
6. Calculate the maximum frequency output from the
VFD. Maximum frequency = motor frequency (Hz) *
fan maximum 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 maxi-
mum 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 maxi-
mum 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 oper-
ates 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 En-
ergy 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 37 and 38 for additional VFD information.
VFD with Bypass —
factory-installed, they are wired to the motor and fully test-
ed before shipped. The VFD is programmed at the factory
as ordered, including electronic overload, which is pro-
grammed for the motor FLA (full load amps) as supplied.
Open the bypass box cover and the fan section access
door to check for any damage before proceeding.
138
When the VFD and bypass are