Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual page 144

WIRING
1. Select a suitable location in the bottom panel of the by-
pass box to connect field-supplied power source.
2. Before drilling any hole, be sure the hole and any
field-supplied conduit fittings will not interfere with
the door or components inside the enclosure.
3. Drill the appropriate size hole and connect the field-
supplied conduit to the enclosure.
4. Refer to the wiring diagram supplied with the bypass
and connect the line voltage power source to the line
voltage terminals (L1, L2, L3) 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 bypass box.
7. Refer to the VFD Wiring section, Steps 7 and 8 (page
137), to connect VFD control wiring.
START-UP AND TEST — Before applying power to the
VFD Bypass and VFD, verify that the motor overload inside
the bypass has been set to the full load amperage (FLA or
RLA) as specified on the motor nameplate.
IMPORTANT: Some bypass assemblies (208/230-60,
200/230-50, 380/400/415-50) contain a multi-tap con-
trol transformer. The line voltage tap on the control
transformer must be adjusted to the appropriate line
voltage.
J1 – DIP Switches for Analog Inputs
The switch is one of two types:
AI1: (in Voltage Position)
AI2: (in Current Position)
Original
Examples:
BOTH SWITCHES IN
VOLTAGE POSITION
BOTH SWITCHES IN
CURRENT POSITION
Fig. 113 — Setting AI Switch to Voltage Position
Illustration of available switch
positions; not default settings
Alternate
NOTE: Bypasses with a 115-v control transformer can be
field modified to incorporate a normally closed safety
contact. This safety contact (in addition to the VFD shut-
down wiring) wires into the fire alarm system to shut down
the unit even if the unit is running in the bypass position.
See Fig. 114 and 115.
1. Set the switch on the front of the bypass to the OFF
position.
2. Verify that the fan freely rotates and remove and loose
items inside the fan section.
3. Close and secure the fan access door and the bypass
and VFD covers.
4. Apply power.
5. Set the switch to the LINE position and verify that the
fan operates.
For 3-phase motors:
Place the switch back in the OFF position and careful-
ly open the fan access door.
Verify that the fan wheel is rotating in the proper direc-
tion. If it is not, remove power and reverse any two of
the line voltage connections in the bypass box (L1, L2,
L3). DO NOT swap the motor leads; this will cause the
fan to rotate in the reverse direction when operating
from the VFD.
6. Make sure the bypass cover is closed then apply
power.
7. Set the switch to the DRIVE position and verify that
the VFD operates.
8. Press the Hand button and verify that the fan operates.
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