Troubleshooting - Tescom ER1200 Series Operation & Service Manual

TROUBLESHOOTING

ER1200 Symptom
Unable to maintain outlet
pressure
Positive output pressure
with zero setpoint
Outlet pressure is equal
to inlet pressure
Outlet pressure does not
follow setpoint changes
Outlet pressure becomes
uncontrollable (unstable
or unable to establish
setpoint)
Form # 1925 Rev. 4/06 TESCOM
Cause
ER1200 exhaust valve
leaking
ER1200 supply pressure is
not high enough
ER1200 inlet solenoid valve
leaking
ER1200 supply pressure
exceeds the maximum
ER1200 not getting a
feedback signal
ER1200 jumpers not
configured correctly
ER1200 GAIN, INTEGRAL,
or DEADBAND are out of
adjustment
The feedback signal reacts to
a process change at a slower
bandwidth than the ER1200
(25 milliseconds)
There are leaks in the
downstream pressure line
The system design has
components that can cause a
delay in down stream
transducer response while
the up stream pressure is
allowed to build up (pressure
differential between
measurement point and
source)
8
Remedy
Return unit to factory for
replacement of valve
Check the incoming pressure
to the ER1200 and ensure that
it is between 10 to 20 PSIG
above the maximum desired
output pressure
Return unit to factory for
replacement of valve
Lower supply pressure to less
than 115 PSIG
Check transducer wiring and
feedback jumper settings
Reconfigure jumper settings
according to page
Read TUNING THE ER1200
(page 6) in this manual and
readjust the gain and pots per
that section
Replace the transducer with
one that has a full range
response time at least as fast
as that of the ER1200
Locate and eliminate all leaks
Eliminate the flow restriction, or
slow down the ER1200
response time by restricting the
flow of supply pressure into the
ER1200