Ulvac VD30C - Page 46

YK15-0009-DI-002-04
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CAUTION
⑤ Caution shall be required for the operation under high pressure range.
(1) In the continuous operation of VD90C
, perform it in the inlet
pressure at 1000Pa or less. The temperature of the Pump
becomes very high temperature, and the Pump may break.
(2) C
ontinuous operation one hour or more under high pressure
1000Pa or more would increase the oil volume that are
discharged as the oil mist and cause rapid parts wear or cause a
trouble such as burning.
You are recommended to control the oil level on regular
ly
supplying the Pump
oil. Also, it is recommended to install the oil
recovery mechanism (Option).
The maintenance cycle might become shorter.
(
3) Upon performing the continuous operation at the high suction
pressure, the oil temperature becomes very high
temperature. As
a result, the oil rapidly deteriorates, and the attained pressure
and the exhaust speed go bad, and it causes the rapid abrasion
of parts and the failure of seizing up. Frequently perform
replacement of the Pump oil. Also, it is effective
to cool the oil
inside
the Pump
by installing the oil cooler.
CAUTION
When using the automatic vacuum breaker (Time lag electromagnetic
leak valve which introduces the air in the Pump
by the valve opening in
3~5 sec. after stopping the motor for the Pump
drive), do connection so
that it gangs with the motor.