BRONKHORST FLOW-BUS, Instruction Manual

Page: 16 / 16

BRONKHORST HIGH-TECH B.V.
9.17.024
Page 16
TROUBLESHOOTING
Symptom Possible cause Action
No output signal on FLOW-BUS
interface Bad communication with FLOW-BUS Check communication e.g. with
local readout module or PC-test
program
No or slow response to setpoint
changes Slope value could be set too high
(ramp function for setpoint signal) Check and/or change slope value
with readout module or PC-software
program
Control mode/setpoint source for
instrument could point to a different
setpoint source Check if correct control
mode/setpoint source is selected for
the instrument
Other instrument (or PC) connected
to FLOW-BUS could change the
setpoint Make sure who is in charge to
change setpoints
Polynomial factors could be wrong Check if right fluid has been
selected and check polynomial
factors A..D with those on your
calibration certificate
Inaccuracy of measurement Wrong fluid (and thus calibration
settings) could be selected (up to 8
fluids possible) Check if correct fluid is selected for
this instrument
Check if powering of instrument is
done correctly
Analog output range is too low/high Wrong output range could be selected Check if wanted output range
(analog) is selected
No/bad connection to FLOW-BUS Wrong cable used
Check cabling
Bad termination of RS485 bus-line Check bus termination
Other module(s) on the bus could
cause trouble Check correct functioning from other
module(s) on the bus (PC-programs
with interface modules included)
No communication possible with PC-
software program Interface settings could be wrong Check settings e.g. for RS232
(COM-port and baudrate)
Interface has bad connection to
FLOW-BUS Check cabling of interface
Red or green LED’s are blinking on
top of the instrument Instrument is in a special operation
mode or is indicating some kind of
error/warning See manual 9.17.023 for more
details
No/bad reaction to manual
instructions by means of micro push-
button switch on top Some actions can only be used under
special conditions See manual 9.17.023 for more
details
Master-slave controlling doesn’t
function well Connection to master signal could be
lost Check if master output is given
correctly
Settings for this special controlling
mode could be wrong Check if settings are correct (control
mode, slave-factor)
Controller doesn’t function as wanted Settings for controller are for other
behaviour than you want Under certain conditions you could
run an auto-tune for controller
optimisation.
(see manual 9.17.023)
Change reponse factor settings for
controller (see manual of
readout/control module or
PC-software)
Other troubles One or more parameter settings could
be wrong Get back original factory settings by
means of micro push-button on top
(see manual 9.17.023)
Contact sales representative for
assistance if the above doesn’t help