mensor PCS 400, Operation Manual

Page: 64 / 118

Table 5.1 continued...
Symptoms and Clues Possible Cause Try This
7 SYSTEM UNABLE TO COMMUN-
ICATE OVER THE GPIB
CLUE: Signals are not being
transferred from the GPIB board to
the rear panel of the PCS 400.
T h e G P I B a d d r e s s o r
termination character is set
incorrectly.
- - - - - - - - - - - - - - - - - - - - - -
GPIB cable is disconnected at
the front of the electrical
module
Æ
.
- - - - - - - - - - - - - - - - - - - - - -
The GPIB card is not properly
s e a t e d i n t h e e l e c t r i c a l
module.
C h e c k a n d r e s e t t h e G P I B
parameters from the front panel
keys.
- - - - - - - - - - - - - - - - - - - - - - - - -
Re-connect the cable.
- - - - - - - - - - - - - - - - - - - - - - - - - -
Re-seat the GPIB card into its
mating connector.
8 SYSTEM UNABLE TO COMMUN-
ICATE OVER THE RS-232 PORT
CLUE: Signals are not being
transferred from the CPU board in
the electrical module to the rear
panel.
The RS-232 parameters are
not set up properly
- - - - - - - - - - - - - - - - - - - - - -
T h e
R S - 2 3 2 c a b l e i s
disconnected from the CPU
board
Ç
.
- - - - - - - - - - - - - - - - - - - - - -
CPU board not seated.
Check and reset serial parameters
from the front panel keys.
- - - - - - - - - - - - - - - - - - - - - - - - -
Re-connect the cable. The red
conductor connects to pin 1, COM1.
- - - - - - - - - - - - - - - - - - - - - - - - - -
R e - s e a t C P U b o a r d i n t o i t s
connector.
9 I N A C C U R A T E O R N O R E -
S P O N S E T O T H E S O U R C E
PRESSURE TEST
CLUE: The auxiliary transducer on
the pneumatics module measures
the source pressure by opening
only the coarse supply solenoid. Its
calibrated analog output is read by
the electrical module and converted
to pressure.
Transducer cable is discon-
n e c t e d o n t h e a u x i l i a r y
transducer board
Â
or at the
50 pin connector
Ä
on the
electrical module.
- - - - - - - - - - - - - - - - - - - - -
The coarse supply solenoid
À
is not connected or not
opening.
Re-connect the cable.
- - - - - - - - - - - - - - - - - - - - - - - - - -
Run the solenoid test to determine
if the coarse supply solenoid valve
is operating.
10 TOP LINE OF DISPLAY SHOWS
ZEROS DURING BAROMETRIC
REFERENCE CALIBRATION,
B U T S H O W S B A R O M E T R I C
PRESSURE WHEN THE BARO-
M E T R I C S E N S O R I S M A D E
ACTIVE.
CLUE: The PCS 400 looks for a
specific transducer address during
barometric calibration.
Either the address on the Bar-
ometric Reference Sensor, or
the interrupt is improperly set. Check that the address of the
Barometric Reference Sensor is set
to address 2 (W2) with no interrupt
(no jumper) on W8 or W9.
PCS 400
MAINTENANCE
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