69
30AW
High-Pressure suppression TE control
Over-current preventive control
Current release value shift control
1. This control routine suppresses that pressure which becomes abnormally too high during the cooling operation.
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guard) if TE < 67°C, the compressor is enable to restart. After the compressor restart, the unit current is continuously con-
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The error counter will be cleared if TE < 67 for 10 minutes of continuous operation.
3. When TE ≥ 67°C is detected again within 10 minutes, 1 is added to the error counter and restart is repeated.
4. If the errors counted are 10, the value is considered as a malfunctioning and the system operation is locked out .
TE: Entering
(in Heat
exchanger)
temperature
1. This control routine stops the compressor when over-current preventive circuit has detected an abnormal current.
2. The compressor restarts with error count 1 after 2 minutes 30 seconds (time guard).
3. If the error counted are 4, the value is considered as a malfunctioning and the system operation is locked out.
1. This control routine prevents troubles of the electron parts such as G-Tr of inverter compressor drive system and
compressor’s troubles during cooling operation.
2. This control corrects the current release control value (l1) by TO sensor value.
3. The value corrected is based upon the following control diagram and correction value table.
T+8
TO[oC]
T+7
T+5
T+4
T+2
T+1
T
T-1
I1 x a%
I1 x b%
I1 x c%
I1 x d%
As I1
Control management
5
Tabcd
30AWH004
39°C
30AWH006
30AWH008
30AWH012
30AWH015
SM_30AW.indd 69 14-03-2011 14:45:18
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