Page 30
Motor Start-Up
When B3 begins start-up, the motor gently vibrates back and
forth for a moment. This is normal. During this time the elec-
tronic controller is determining the exact position of the rotor.
Once the motor begins turning, the controller slowly eases the
motor up to speed (this is called soft-start"). The motor may
take as long as 10-15 seconds to reach full speed. If the motor
does not reach 200 rpm within 13 seconds, the motor shuts
down. Then the motor will immediately attempt a restart. The
shutdown feature provides protection in case of a frozen bear-
ing or blocked blower wheel. The motor may attempt to start
eight times. If the motor does not start after the eighth try, the
controller locks out. Reset controller by momentarily turning off
power to unit.
The DC filter capacitors inside the controller are connected
electrically to the motor supply wires. The capacitors take
approximately 5 minutes to discharge when the disconnect
is opened. For this reason it is necessary to wait at least 5
minutes after turning off power to the unit before attempt-
ing to service motor.
DANGER
Disconnect power from unit and
wait at least five minutes to allow
capacitors to discharge before at-
tempting to service motor. Failure
to wait may cause personal injury
or death.
Power Choke (L13)
A choke coil is used on SLP98UHV 4 and 5 ton units
equipped with 3/4 hp and 1 hp motors.The choke is located
on the blower housing and is used to suppress transient current
spikes.
FIGURE 9
BLOWER B3 HARNESS CONNECTORS
MOTOR with INTEGRATED
CONTROLLER
SHAFT
P49 4 Pin
P48 5 Pin
J48 5 Pin Line Voltage Connector
J49 4 Pin Control Connector
J48 5 Pin
J49 4 Pin
