Protection For Compressor Locked - Panasonic NR-BY551SS Service Manual

4.2 Protection for compressor locked

• After starting 2 sec., does IC detect
rpm < 5r/sec.?
1
• After starting from 2-10 sec., does PCB
detect rpm over 120r/sec.?
2
IC orders to stop compressor for 10 min.
3
IC cancels to stop compressor after 10 min.
After restarting, does "Stop compressor"
4
occure 10 times within 2 min.?
IC cancels to stop compressor.
5
Normal operating?
7
Does system protection cycle for 333 times?
8
IC order to stop compressor completely.
SYSTEM PROTECT CONTROL CYCLE
1st time
OPERATE each 7min X 10 times
NO
YES
YES
NO
NO
YES
COMPRESSOR 1hour STOP
• Normal operating.
• IC continues to stop compressor until 1 hour.
• IC indicates Self Diagnosing sign.
6 After 1 hour.
SYSTEM PROTECT CONTROL CYCLE
333rd time
OPERATE each 7min X 10 times
- 8 -
NR-BY551 / NR-BY601
STOP COMPRESSOR