Nidec Embraco CF01F - Page 32

Status
data
Low byte
bit of
status data
Description
Remarks
0000h
-
Normal operation
Typically this data is returned
4)= 00h, 5)= 00h
0002h
1
Power/Thermal protection
4)= 02h, 5)= 00h
0080h
7
Set speed data out of spec
4)= 80h, 5)= 00h
FF00h
-
Compressor stopped (waiting
for a valid start speed)
4)= 00h, 5)= FFh
FF01h
0
Start fail / Motor cable failure
4)= 01h, 5)= FFh
→ Compressor fail
FF02h
1
Overload failure
4)= 02, 5)= FFh
→ Compressor fail
FF04h
2
Under speed failure
4)= 04h, 5)= FFh
→ Compressor fail
FF08h
3
Wrong rotor position failure
4)= 08h, 5)= FFh
→ Compressor fail
FF10h
4
Overvoltage failure
4)= 10h, 5)= FFh
→ Inverter fail
FF20h
5
Over-temperature failure
4)= 20h, 5)= FFh
→ Compressor fail
Table 20 – Serial Communication – Status Data
Note 1: When one or more errors occur, the corresponding bits are set to 1.
Example: Overload (0b00000010) and Under speed (0b00000100): 0xFF06
Note 2: The status data high byte defines the compressor state:
00xxh → compressor is running
FFxxh → compressor is stopped
4.2.4. Serial control connection and electrical schematic
The thermostat is connected to the Inverter through the CN209 connection, using the
Control Input Cable. Use the IN terminal for the Thermostat TX signal, the GND for the
Ground signal and the OUT terminal for the Thermostat RX signal (Figure 22).
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