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When any failure or unusual phenomenon occurs in the equipment, execute at first the fault
diagnosis shown in the following table. When making contact with or making an inquiry to us,
please check the lighting status of PLC lamp arranged to the electrical circuit in advance.
Ensure that main power is disconnected before inspecting the power source or inside
of the equipment. Some parts of the equipment may remain in high temperature
right after stopping operation. Use caution to avoid burn injury.
Problem
(1) Equipment fails to start
even if the RUN/STOP
switch is turned on
(The RUN/STOP switch
lamp fails to come on.)
(2) Equipment fails to start
even if the RUN/STOP
switch lights up.
(3) Power breaker is tripped. Short-circuit or electric
(4) GN2 AL. lights on. The
RUN/STOP lamp
flickers at the same time.
13. Troubleshooting
WARNING
Possible Cause
The main power source
(breaker) is turned OFF.
The power cord is not
connected.
The circuit breaker of
EMP-14W is turned OFF.
The fuse of electrical circuit of
EMP-14W is blown.
The emergency stop button is
pressed.
The remaining LN
decreased down to the
re-starting level.
leakages occur.
GN-10i is suspended.
IM-120 is suspended.
Nitrogen gas supply decreases,
or the pressure is lowered
temporarily.
ULVAC CRYOGENICS INCORPORATED
Corrective Action
Turn ON the main power
source.
Connect the power cord
correctly.
Turn ON the circuit breaker.
Replace the fuse with a new
one.
If the fuse is blown repeatedly,
please contact us.
Reset the emergency stop
switch by turning it in
direction of arrow, and close
the power source again.
level is not
When the remaining LN
2
decreased to 75% or less, the
liquefaction starts
automatically.
Please contact us.
Check the electric wiring of
GN-10i, or Suspend and
resume EMP and GN-10i.
Check the dry air supply
pressure.
Refer to "8-5-3. Corrective
action when GN2 AL. occurs"
and restart EMP-14W.
is
2
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