SiUS281117
Protection Control
44
Function and Control
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
".
57Hz
High pressure
standby
Every
5 min.
•
Inverter upper limit frequency
•
Pc
≤
483 psi
•
During oil return operation
•
After oil return operation
•
Stopping operation
•
Heating operation
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
