TROUBLESHOOTING
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4. TROUBLESHOOTING
Symptom: Meter does not deflect when power is turned ON.
(1) Replace the fuse (250 VAC, 0.5 A). Before replacement,
shut off the power to the controller.
(2) If the fuse blows out immediately after replacement, repair is
necessary.
Turn OFF the power before replacing a fuse. Replacing a fuse with the
power turned ON can cause electric shock.
Use rated fuse
Use a fuse of the prescribed rating. Do not use a fuse other than the
prescribed one or do not short the fuse holder. Damage or fire may result.
• Mater calbe (between the controller
and meter) is
disconnected.
(1) Reconnect the connector after turning OFF the power to the
controller.
(2) Check the 5-pin connector between the controller and meter for
continuity by a circuit tester.
(See Fig. 17)
(3) If the connector is broken, replace it.
Turn OFF power.
Before touching any terminal on the rear of the meter or if there is a possibility
of touching it, turn OFF the vacuum gauge p
ower and the power applied to the
setpoint output terminal. Contact with the terminal, to which the voltage (
24
VDC) is applied, will cause electric shock if power is turned ON.
Symptom: The indication has deflected off-scale to the right (atmospheric direction) and does not
return.
• Pressure is beyond the measurable
range.
(1) The measurable range of the GP-1GRY is 0.4 to 2700 Pa.
(0.003 to 20 Torr.)
• Sensor head cable is not connected.
(1) Reconnect the sensor head cable after turning OFF the power
to the controller.
Symptom: The indication has deflected off-scale to the right (atmospheric direction) and does not
return.
• Filament is disconnected
(1) Check the filament for continuity by a circuit tester. At this
time, do not energize the filament with a current more than
10 mA. Its life will be shortened.
The filament resistance is about 13 Ω
at atmospheric
pressure. (See Fig. 20)
(2) When the filament is disconnected, replace it.
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