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SiUS28-902_B
Protection Control
Function
23
4. Protection Control
4.1
High Pressure Protection Control
Pc: High-pressure sensor detection value
This high-pressure protection control is used to prevent the activation of protection devices due
to abnormal increase of high pressure and to protect compressors against the transient
increase of high pressure.
[Cooling]
[Heating]
Pc > 512 psi
Every 10 sec.
Pc > 505 psi
Pc > 526 psi
10 sec.
Pc < 490 psi
Pc > 547 psi
Keeping the current step
Every 60 sec.
490 psi
≤
Pc
≤
505 psi
OR
&
High pressure not limited
High pressure limited
INV. upper limit frequency:
1-step up from current
compressor frequency
INV. upper limit frequency:
1-step up from current error
frequency
INV. upper limit frequency:
1-step down from current
compressor frequency
When occurring 3 times within 30
minutes, S1PH (High pressure switch) is
activated without high pressure standby,
thus outputting the error code "
E3
".
•
Inverter upper limit frequency
•
Pc
≤
483 psi
•
During oil return operation
•
After oil return operation
•
Stopping operation
•
Heating operation
57Hz
High pressure
standby
Every
5 min.
Pc > 469 psi
Pc > 527 psi
57Hz
Pc < 441 psi
High pressure not limited
High pressure drop
When S1PH (High pressure switch) is
activated, the error code "
E3
" is output.
High pressure
limited
High pressure
standby