Parker Porter MPC Series, Инструкция по установке, программированию и эксплуатации

Страница: 26 / 30

- 24 -
SECTION 7 – TROUBLESHOOTING
ALARM CODE DISPLAY
When a flow rate deviation alarm occurs or when an alarm occurs during MFC self-diagnostics, the
operating mode defaults to the operating mode currently selected at ‘
C-16 ’ in the function setup,
‘Operation selection at alarm occurrence‘. This holds true for all alarm codes except ‘
AL71
’.
The upper display alternately indicates the alarm codes shown in the table below and the regular display,
the instantaneous flow rate display. Alarm codes are displayed only when the instantaneous flow rate,
operation mode or totalized flow rate is displayed.
ALARM
CODE
ERROR POSSIBLE CAUSE CORRECTIVE ACTION
AL01
Flow rate deviation
lower limit alarm Insufficient alarm judgment delay
time. Insufficient power supply
voltage. Insufficient inlet pressure,
etc. or excessive operating
temperature. If none of the possible causes
resolves the problem, contact
factory.
AL02 Flow rate deviation
upper limit alarm Insufficient alarm judgment delay
time, valve problem, sensor problem,
etc. If no problem found with
delay time, contact factory.
AL71 Valve overheat
prevention limit is
actuated During the control or fully-open mode,
the gas is shut off for more than five
(5) minutes. If the gas is shut off for more
than five (5) minutes, set the
set flow rate (
SP ) to zero or
valve fully-closed.
AL81 Sensor error Sensor problem, particulate in sensor
or use of helium or hydrogen gas. Turn power off and restore
power. If sensor not
restored, contact factory.
AL91 I/O correction data
error Data corrupted due to electrical
noise. Contact factory.
AL92
Sensor calibration
data error Data corrupted due to electrical
noise. Contact factory.
AL93 User setup data error Power loss during data transmission. Reset data.
‘ AL71 ’
(valve overheat prevention limit) is available only for Model MPC20. Despite the current selection
at ‘ C-16 ’ in the function setup, ‘Operation selection at alarm occurrence‘, the valve drive current is forcibly
limited. If this situation occurs for thirty (30) minutes or more, the valve is fully closed.
If
‘ AL81 ’
(sensor error) occurs, the flow rate will be uncontrolled. This occurs even if the ‘
C-16
’ function
setup ‘0: Control continued (alarm ignored)’ is selected.
When ‘1: Move to fully closed’ or ‘2: Move to fully open’ is selected at ‘
C-16
’ in the function setup, the
alarm display and the operating mode at alarm occurrence can be maintained even after the cause of
alarm is removed. When canceling the alarm, perform the alarm reset operation.
Alarm Reset Operation
When the [
ENT
] key is continuously pressed while the instantaneous flow rate is displayed, the alarm will
reset after three (3) seconds.