OM00017 Rev B, FP00066, FP00102 Operation Manual – March 24, 2023 Page 6 of 10
Power Supply – FP00066 ONLY
The CB00067 motor drive board PCB shipped with the LCM is a 48 VDC unit. The operating voltage range
is 43 VDC – 50 VDC. The LCM may draw up to 10.5 A of current during normal operation (compressor
and fans combined). Aspen recommends at least 16 AWG wire for the power supply to the compressor
drive board with an in-line 10 A fuse (see Appendix page 3)
Power Supply – FP00102 ONLY
The CB00066 motor drive board PCB shipped with the LCM is a 24 VDC unit. The operating voltage range
is 22 VDC – 30 VDC. The LCM may draw up to 16 A of current during normal operation (compressor and
fans combined). Aspen recommends at least 12 AWG wire for the power supply to the compressor drive
board with an in-line 15 A fuse (see Appendix page 3).
Thermal Switch
The LCM is provided with a thermal switch attached to the top of the compressor. This thermal switch
provides protection for the compressor to prevent overheating in the case of a failure condition (e.g.
blocked air, failed fan, elevated ambient temperature, etc). This thermal switch shall be connected to
the overheat tab (TB11) and the ground tab (TB9).
Compressor Control
Please refer to the Universal Low Noise Sinusoidal BLDC Drive manual (see appendix) for detailed
wiring and functionality of the drive board. Use the included three-conductor harness to connect the
drive to the compressor.
The motor drive board is a variable speed drive. This allows the cooling capacity of the system to be
adjusted by increasing or decreasing the compressor speed. The compressor drive board can use one of
four different speed input signals: 0 – 5 V analog voltage (factory default), 0 – 10 VDC analog voltage, 4 –
20 mA, and frequency (see Appendix pages 5 - 6). The firmware has a minimum speed of 1200 RPM
(condition-dependent) and a maximum speed of 6500 RPM.
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