Troubleshooting guide

69
Trouble Shooting Flowchart (Vission Only)
A bank of pressure or temperature
channels no longer function.
A pressure channel reads a negative
number over -140
A temperature channel reads a large
negative value over -400°
Screen Cursor will not retain cali-
bration.
There are four fuses on the Analog board that limit the
current on the 24VDC to the Analog channels. The fuses
are 500 milliamp, located near the power supply connec-
tors and brown in color. LEDs next to the fuses give a
visual indication of the status of the fuse, however, it is
best to pull the fuse and check them with an ohmmeter. If
any are blown, find the shorted device that is responsible
for the blown fuse and replace.
F1 protects the +24VDC supply to the pressure transduc-
ers and relays.
F2 protects the –12VDC supply which is subregulated to
5VDC required for multiplexers, analog to digital converts
and temperature channels.
F3 protects the +12VDC supply, which is subregulated to
+5VDC, required for multiplexers, analog to digital con-
verters, and temperature channel.
F4 protects the main +5VDC supply required for most of
the components on the analog board.
If F1 blows, the pressure transducers will produce errone-
ous readings and the relays on the relay board will drop out
(de-energize). If F2, F3 or F4 blows, all analog readings
will be affected.
This indicates the transducer wiring or transducer is either
open or shorted. Check wiring to print.
Check fuses F1, F2, F3 and F4 on analog board.
This indicates the RTD wiring or RTD is open. Check
wiring to print.Check fuses F1, F2, F3 & F4 on analog
board.
Calibrate the screen cursor, TWICE, per the instructions
provided in the manual.
Go to “IP Address” screen and clear IP Address. Re-enter
the same IP address
Go to Change Date/Time and clear both. Re-enter
appropriate date and time.
Save changes and backup settings.
Power off the panel.
Power on the panel.
Verify the screen cursor follows the fingertip correctly.