If the inner side of the pump is contaminated, it is possible you will not get the
necessary ultimate vacuum performance or the pump-down times can increase. Return
the pump to our service centre for cleaning. Refer to
on page 101.
You can use the organic solvent to clean the external surface of the pump. We
recommend you to use non-CFC solvents such as isopropanol or ethanol. Only small
amount of a cleaning solution is necessary to clean the pump surface.
For environmental reasons, keep wastage of cleaning solutions and solvents to a
minimum.
7.4 Decoding service status words
The service status can be accessed through the serial link. This method of accessing
service status will give the most complete information of current and future service
requirements and preventative maintenance activities can be scheduled.
A summary of the current pending service status is given in response to the service
status command that follows:
Command
?
v
8
8
1
cr
The reply is as follows:
Reply
=
v
8
8
1
sp h
h
h
h
h
h
h
h
cr
The service status word is made up of 8 hexidecimal digits. To decode the word, convert
each digit into a 4-digit binary number (same as the system status word, given in
on page 95).
Each binary digit (bit) represents a flag that is active (state 1) or not active (state 0). To
help decode the service status word, each bit is numbered (starting with 0 for the least
significant to 31 for the most significant) as shown in
page 95. The meaning of each bit in the service status word is given in
on page 94.
Table 31
Service flags
Bit number
Status flag
Active flag means
0
Oil cartridge service
due
Set when hours until oil cartridge service due
= 0
1
Bearing service due
Set when hours until bearing service due = 0
2
Pump service due
Set when hours until pump service due = 0
or cycles until pump service due = 0
3
Controller service due
Set when hours until controller service due =
0
4
Reserved
-
5
Reserved
-
6
Reserved
-
7
Service due
Service is due. Specific operation necessary
should be determined by checking the bits
above
07/2021 - ©Edwards Limited
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