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M-SV-001-EN Rev. G
Figure 4-273 BMCC
4.28.1 BMCC Connections
The BMCC is connected to J2 and J3 on the Backplane. Refer to "Figure 4-265 Backplane Connections"
on page 208.
4.28.2 BMCC Verification
4.28.2.1 BMCC Power Verification
1. Remove the Service Side Cover. Refer to "4.2.3.1 Service Side Cover Removal and Installation"
on page 58.
2. Measure the voltages at the +15V, -15V, and +5V test points.
3. Isolate compressor power and wait for the Backplane LEDs to go out.
4. Remove the BMCC from the Backplane.
5. Verify the Inverter cable is connected to the Backplane.
6. Turn ON the AC input power and measure the voltages at the +15V, -15V, and +5V test points.
The measured voltages should be similar to those measured when the BMCC is installed.
4.28.2.2 BMCC Communication Verification
This section requires the use of the SMT. Refer to the Service Monitoring Tools User Manual for
guidance.
1. Using the SMT installed on your computer, connect to the compressor using the Compressor
Connection Manager tool.
2. If the system is able to connect, the BMCC is able to communicate with the user interface.
3. If the system is not able to connect, verify:
a. The BMCC is properly connected to the Backplane.
b. The I/O cable connection between the Backplane and the Compressor I/O Board is properly
attached.
c. The cable connection between the Compressor I/O Board (RS485 or RS232) and the user
interface (user PC or chiller controller) is properly attached.
d. Inspect Backplane for indication of damage.
5. Cycle power and reattempt communication with the compressor.
4.28.3 BMCC Battery and Verification
All BMCC printed circuit boards (PCBs) include a real-time clock integrated circuit (RTC-IC) for the
purpose of maintaining the time and date of compressor events. While power is applied to the
compressor, the BMCC receives a 5V supply via the Backplane to power the RTC-IC. The battery
becomes the RTC-IC power supply and maintains the date and time only in the event of a power loss,
if the BMCC is installed on a compressor that is not powered on, or if the BMCC was never installed on
a compressor at all.
The Backup Battery does not affect the operation of the compressor in any way, shape, or form nor
BMCC
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