Danfoss Turbocor TT Series, Руководство по обслуживанию

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4.26 Serial Driver
Figure 4-243 Serial Driver
4.26.1 Serial Driver Function
The Serial Driver is powered with +15VDC and +24VDC from the Backplane.
The Serial Driver pr24VDC to the Motor-Cooling Solenoids, +15VDC to the IGV stepper motor, and +15VDC
to the external expansion valves on the I/O board.
The Serial Driver also controls the RUN and Alarm LEDs on the Backplane and the STATUS indicator on the I/O board.
All actions of the Serial Driver occur when signaled from the BMCC.
4.26.2 Serial Driver Connections
The Serial Driver is connected to J8 of the Backplane. All components that communicate with the Serial Driver are
connected to the Backplane. Refer to Figure 4-238 Backplane Connections on page 212.
4.26.3 Serial Driver Verification
4.26.3.1 Serial Driver Input Voltage
1. Remove the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
page 54.
2. With main power on, using a multimeter set for DC voltage measurements, verify the voltage on the
Bac15V and +24V test points as defined in Table 4-40 Backplane Test Points on page 213 for
the locations of the test points. The results should be within the voltage range specified in Table 4-42
Backplane Test Point Values on page 215.
3. Isolate compressor power and wait for the Backplane LEDs to go out.
4. Unplug connectors J4 and J24 from the Backplane.
5. Using a multimeter set for resistance measurements, place the multimeter leads in the Bac15V
and +24V test points as defined in Section 4.25.2.1 LED Locations on page 213. The results should be
greater than the resistance specified in Table 4-42 Backplane Test Point Values on page 215.
6. Install the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
page 54.
7. Return the compressor to normal operation.
M-SV-001-EN Rev. H-1/23/2023 Page 217 of 294