ULVAC CRYOGENICS INCORPORATED
35
Problem
Possible Cause
Corrective Action
The power source is
connected with phase
reversed, or the voltage drops
(STS 1-8 of UW701N lights
up.)
In case of reversed phase,
replace 2 lines in 3 lines.
When power supply voltage is
falling, check the main power
supply.
Internal temperature of
UW701N abnormally goes up.
(STS 2-8 of UW701N lights
up.)
(STS 3-8 of UW701N lights
up.)
Contact us.
The cooling water is not
supplied, or the cooling water
flow rate drops. (STS 4-8 of
UW701N lights up.)
Supply the cooling water
sufficiently. Then, reset
UW701N, and next, press
RESET of MP-300K.
Helium gas pressure is
declining.
（
STS5-8 of UW701N lights
up
）
Check helium gas pressure. Add
helium gas and reset the
system. When it occurs again,
contact us.
Cold head motor protection
worked.
（
STS6-8 of UW701N lights
up
）
Turn ON the circuit protector
(CP2) of the UW701N back.
Carry out reset operation after
that. When it generate again,
make contact with us.
Compressor motor protection
worked.
（
STS7-8 of UW701N lights
up
）
Check the power supply voltage
and helium pressure. When
they are within the normal
range, shutdown the power
source for a few minutes and
then restart. Contact us when
this occurs again.
UW701N controller is in error
state.
(STS8 of UW701N lights up)
Shutdown the power source for
a few minutes, and then restart.
Contact us when this occurs
again.
