Hitachi FSG Series, Technical Catalogue

Page: 409 / 424

TROUBLESHOOTING
18
/17
n
ACTIVATING CONDITION OF PROTECTION CONTROL CODE
For following the conditions as the temperature change,
etc., the control of frequency, etc. is performed to prevent
the abnormal conditions by the protection control. The activating conditions of protection control are shown in
the table below.
Code Protection Control Activating Condition Remarks
2
Pressure Ratio
Control Compression Ratio
³
9
®
Frequency Decrease
(Pd/(Ps+1.3))
£
2.2
®
Frequency Increase
Ps: Suction Pressure of
Compressor
2
High-Pressure
Increase Protection
Pd
³
2.4 Mpa
®
Frequency Decrease
Pd: Discharge Pressure of
Compressor
2!
Current Protection
Inverter Output Current
³
25A (220 V), 14A (380, 415V)
®
Frequency Decrease
-
2"
Inverter Fin Temperature
Increase Protection
Inverter Fin Temperature
£
94 °C
®
Frequency Decrease
-
2#
Discharge Gas
Temperature Increase
Protection Temperature at the top of compressor is high
®
Frequency Increase (Maximum temperature is different
depending on the frequency.)
-
2$
Low-Pressure Decrease
Protection
Low-Pressure Is Excessively Low
®
Frequency Increase (Minimum pressure is
different depending on the ambient temperature.)
-
For
16, 20HP
When Switching,
D
P<0.5MPa
®
Frequency Increase
D
P<1.3MPa
®
Frequency Decrease
2%
4-Way Valve
Switching
Control
For
24, 30HP
When Switching,
D
P<1.0MPa
®
Frequency Increase
D
P<2.1MPa
®
Frequency Decrease
D
P = Pd - Ps
For
5, 20HP
Frequency less than 40Hz is maintained for more than 1 hour
®
Frequency
³
40Hz
2&
Oil Return
Control
For
24, 30HP
Frequency less than 120Hz at cooling (150Hz at heating) is
maintained for more than 1 hour
®
Frequency
³
120Hz at
cooling (150Hz at heating).
-
2'
High-Pressure Fall
Protection
Pd
£
0.69MPa
®
Frequency Increase
(When Cooling Operation)
Pd
£
1.52Mpa
®
Frequency Increase
(When Heating Operation)
Pd: Discharge Pressure of
Compressor
2)
Running Current Limit
Control
(for 24, 30HP
Running Current for Comp.
³
Setting Value
®
Frequency Decrease
Setting Value:
Upper limit of total running current
is set 80%, 70% and 60% at normal
operation using input on PCB.
2
Pressure Ratio
Decrease Retry
Compression Ratio (Pd/(Ps+1.3)<1.8)
When activating 3 times in an hour,
“43” alarm is indicated.
2
Low-Pressure
Increase Retry
Ps>0.9MPa
When activating 3 times in an hour,
“44” alarm is indicated.
For 5 to
20HP Pd>2.7MPa
(In case of 20 ~ 30Hz: Pd>2.5MPa)
2!
High-
Pressure
Rising Retry
For
24, 30HP
Pd>2.7MPa
When activating 3 times in an hour,
“45” alarm is indicated.
2"
Overcurrent Retry of
Constant Compressor
Current
³
Maximum Value(*1), or Current<0.9A
When activating 3 times in an hour,
“39” alarm is indicated.
2#
Vacuum/Discharge Gas
Temperature Rising
Retry
In Case of Ps<0.02 MPa over 12 minutes,
Discharge Gas Temperature
³
132°C over 10 minutes or
Discharge Gas Temperature
³
140 °C over 5 seconds
When activating 3 times in 30
minutes, “47”(Ps) or “08”
(Discharge Gas) alarm is indicated.
For 5 to
20HP Discharge Gas SUPERHEAT less than 10 deg. is maintained
for an hour
2$
Discharge
Gas
SUPERHEAT
Decrease
Retry
For
24, 30HP Discharge Gas SUPERHEAT less than 10 deg. is maintained
for 30 minutes.
When activating 2 times in 2 hours,
“07” alarm is indicated.
2%
Inverter Trip Retry
Automatic Stoppage of Transistor Module,
Activation of Electronic Thermal
or Abnormal Current Sensor When activating 3 times in 30
minutes, “51”, “52” and “53” alarm
is indicated.
2&
Insufficient Voltage /
Excessive Voltage Retry Insufficient/Excessive Voltage at Inverter Circuit or CB
Connector Part When activating 3 times in 30
minutes, “06” alarm is indicated.