3.4.8 Monitoring Functions
The Compressor Controller monitors more than 60 parameters, including:
l Gas pressure and temperature monitoring
l Line voltage monitoring and phase failure detection
l Motor temperature
l Line currents
l External interlock
3.4.9 Abnormal Conditions
The Compressor Controller responds to abnormal conditions by monitoring:
l Surge RPMs
l Choke RPMs
l Power failure/phase unbalance
l Low/high ambient temperature
l High discharge pressure
l Low suction pressure
l Motor-cooling circuit failure (over temperature)
l Refrigerant loss
l Power supply
l Overcurrent
3.4.10 Bearing PWM Amplifier
The Bearing PWM Amplifier supplies current to the radial and axial magnetic bearing actuators. The PWM Amplifier
consists of high-voltage switches that are turned on and off at a high frequency, as commanded by the PWM signal
from the BMCC.
3.4.11 Serial Driver
The Serial Driver module performs serial-to-parallel conversion on the stepper motor drive signals from the BMCC.
The module also contains four normally open relays under BMCC control. Two of the relays drive the motor-cooling
solenoids, and the other two are used to indicate compressor fault status and running status. The status relays can
be wired to external control circuits.
3.4.12 Backplane
The Backplane physically interconnects the onboard plug-in modules with the power electronics, IGV stepper motor,
motor-cooling solenoids, rotor position sensors, and pressure/temperature sensors.
The Backplane also features onboard, low-voltage DC-DC converters for generating +15V, -15V, +5V, and +17V from
an input of +24VDC. The Backplane receives its +24VDC power input from the High-Voltage (HV) DC-DC Converter
mounted on the topside of the compressor.
The Backplane is also equipped with status-indicating Light-Emitting Diodes (LEDs). All LEDs are yellow except for
the alarm LED, which is green/red. Table 3-6 Backplane LEDs describes the LEDs functions.
Page 32 of 136 - M-AP-001-EN Rev. S 9/8/2021
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