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SiEBE18-526
4. Protection Control
4.1
High Pressure Protection Control
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.
In cooling operation
Pc > 3.55MPa
High pressure limited
Pc < 3.45MPa
INV upper limit frequency:
1-step up from current
compressor frequency
Function
High pressure not limited
&
or
• During oil return operation
• After oil return operation
• Stopping operation
• Heating operation
INV upper limit frequency :
1-step down from current
compressor frequency
Every 10 sec.
Pc > 3.6MPa
Keeping the current step
3.45MPa < Pc≤3.55MPa
Every 60 sec.
Pc>3.75MPa
High pressure
standby
Pc: HP pressure sensor detection value
• INV upper limit frequency
• Pc ≤ 3.55MPa
Every
5 min.
INV upper limit frequency:
1-step up from current
compressor frequency
When occurring 3 times within 30
minutes, HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3".
Protection Control
(Q0374)
67
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Troubleshooting
