Two, Four, Or Six-Fan Array Direct Drive; Direct Drive Plenum Fans With Ec Motors; Start-Up - Carrier Aero 39MN MW03-110 Series Installation, Start-Up And Service Instructions Manual

WHEEL OVERLAP
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Fig. 178 — Fan Wheel Bushing Location
e. VFD maximum frequency setpoint (parameter 2008) =
motor frequency (Hz) * fan max speed (rpm) / motor
nominal operating speed (rpm). Example:
Motor Frequency = 60 Hz
Fan Max Speed = 2979 RPM
Motor Nominal Operating Speed = 1760 RPM
Max Frequency Setpoint = 60 Hz * 2979 RPM / 1760
RPM = 101 Hz
f. Using the Parameters Mode (page 160) on the VFD, ver-
ify that parameter 2008 has been changed to the calcu-
lated value. If it does not match, DO NOT start the unit.
Press Edit (Soft Key 2) to enter correct value for parame-
ter 2008. Press Exit (Soft Key 1).
TWO, FOUR, OR SIX-FAN ARRAY DIRECT DRIVE PLE-
NUM FANS WITH NEMA MOTORS
Start-up procedures for 2, 4 or 6-fan arrays are similar to those for
single direct-drive fans as described in the previous sections, with
the following additions:
1. Start-up procedures must be completed for all fans.
2. If VFD(s) is mounted on fan bulkhead panel at a shipping
split, then the VFD remote keypad assembly is shipped in-
side the fan section. See Fig. 179.
a. Install bracket with keypad by removing an existing
screw from the cover on the vertical frame on the mating
section, taking care to avoid all door latch areas.
b. Position bracket so VFD remote keypad is upright and
attach bracket by re-installing the removed screw.
c. Plug VFD extension cable into the remote keypad and
the VFD.
d. Coil excess cable, secure with wire tie, and route cable
away from fan inlet. Secure with wire ties and screws.
3. If each motor is controlled by a single VFD, then start-up
procedures must be performed for each VFD.
FAN WHEEL
BUSHING BOLTS
KEYPAD FROM
VFD
MATING SECTION
FRAME
Fig. 179 — Remote Keypad Assembly Location
4. If two or more motors are controlled by a single VFD, then
verify that both overloads in the Motor Circuit Protection
box are set to the motors' FLA.
5. Back-draft dampers, if ordered, have been factory installed.
The back draft damper will automatically close if the fan be-
comes disabled, thus preventing air from recirculating
through the disabled fan. Previous fan array units may have
shipped with a fan block-off plate to prevent air recirculating
through the disabled fan. The block-off plate is field installed
when a fan unit is disabled, allowing the other fan(s) to run.
The block-off plate would have shipped in the fan section. It
should have been removed and stored in a safe place for fu-
ture use.

Direct Drive Plenum Fans With EC Motors

START-UP

There are live terminals and connections even with device
switched off. Wait five minutes after disconnecting the voltage
at all poles before opening any motor's terminal cover to pre-
vent risk of shock.
In the event of a fault, the rotor and the impeller will be ener-
gized. To avoid possible injury of death do not touch the rotor
or impeller after installation.
To avoid electrical shock or personal injury follow proper
lockout tagout procedures. If control voltage or a stored speed
set value is applied, the motor will restart automatically (for in-
stance, after a power failure).
Temperatures above 185°F can occur on the motor surfaces,
especially the controller housing. Avoid touching motor sur-
faces to prevent burn injuries.
1. Review and follow all warnings and caution notes concerning
EC motors.
207
EXTENSION CABLE
TO VFD
BRACKET
39MA51000191
FAN SECTION
BULKHEAD
FAN SECTION
FRAME
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WARNING
WARNING
WARNING
WARNING