Appendinx; Trouble Shuttings - Error Massages - Prevac MG14 Operating Manual

MG14 operating manual Rev 1.4

7. APPENDINX

7.1 Trouble shuttings – error massages
L.p. Error message
"NO EMISSION"
1.
"HV FAILURE"
2.
" OVERPREASURE"
3.
" OVERTEMERATURE"
4.
"CATHODE OPEN"
5.
"CATHODE SHORT"
6.
"Ubias FAILURE"
7.
"+24V FAILURE"
8.
Description
Emission is not possible
No high voltage on gauge
anode, or more than ±10V of
differences from 180V ( 500V
for degas)
Measure pressure excide
-3
critical value >1x10 mbar
Temperature inside device too
o
high (> 80 C)
No current in cathode circuit
Current in cathode circuit too
high. Emission current can not
be reached
Bias voltage ( filament potential
) different more than ± 10%
+24V supply voltage different
more than ± 10%
42
Solution
- check gauge connection,
- exchange the B-A gauge
cable,
- exchange the B-A cable,
- pressure to high,
- turn emission on again
- check gauge connection if
there is no shortcut,
- exchange the B-A gauge
cable,
- turn emission on again
- check iv there is no leak in
the system,
- wait till pressure reach
minimum value,
- turn emission on again
- turn emission off – let the
device cool down,
- check if louvers of the
device are not locked,
- be sure that air flow
around device is proper –
check inside cabinet
temperature if device is
mounted in the rack
- check gauge filament if is
not open,
- check gauge connection,
- exchange gauge cable,
- turn emission on again
- check filament if there is
no connection to the
ground or other pins,
- check gauge cable if there
no shortcuts,
- exchange gauge cable,
- turn emission on again
- check gauge cable if there
no shortcuts,
- check gauge connection,
- exchange gauge cable,
- turn emission on again
- turn the device off, wait
10s and turn device on
again
- turn the device off, wait
10s and turn device on
again