Bronkhorst FLOW-BUS interface - Manual (Page 25)

BRONKHORST ®
Page 25 FLOW‐BUS interface 9.17.024
6.2 T ROUBLESHOOTING HINTS AND TIPS
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 baud rate)
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 response 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