Blower Motor - Labconco Logic+ A2 Technical Manual

Blower Motor

The blower motor(s) on the biosafety cabinet require a power connection (with AC
voltage) and a data connection. The AC power supplied to the motor electronic module
is converted to DC inside the motor. The motor is an ECM (electronically commutated
motor), which is a brushless DC motor. The electronics head is programmed by
Labconco for each particular model to operate in constant volume to deliver correct
airflows even as the HEPA filter loads with particulate. If troubleshooting a non-
responsive blower motor, use the following information.
In order to confirm proper voltage presence on the motor, the biosafety cabinet must
have power supplied to it. Take extra care when testing these wires to avoid electrical
shock.
1. The following wiring information lists each wire color as it enters the motor.
Since the motor is in a contaminated area of the biosafety cabinet, it may be
desired to trace these wires back to the top electronics module to verify voltages
without opening the contaminated areas of the biosafety cabinet.
a. The AC line voltage supplied to the biosafety cabinet (100v, 115v, or
208/230v) should be present on the power connector across pins 4 (black
wire) and 5 (white wire).
b. 24VDC should be present on the data connector across pins 1 (brown)
and 15 (yellow).
c. A pulse width modulation signal (PWM) should be present on the data
connector across pins 1 (brown) and 10 (purple).
5-pin
Connector
(Power)
Figure 13-7
146
16-pin
Connector
(Data)