ZEKS Eclipse
TM
90-5,000ZPB Desiccant Dryers
www.zeks.com
16
7.0 ALARMS AND INDICATORS
ALARM
Fail-To-Shift
(Dryer must be equipped
with this Option).
Low Tower Pressure
(Dryer must be equipped
with Fail-To-Shift Option)
Muf
fl
er Clog Warning
(Dryer must be equipped
with Fail-To-Shift Option)
Inlet
fi
lter Pressure Drop
Warning (Optional)
Outlet
fi
lter Pressure
Drop Warning (Optional)
High Inlet Temperature
(Optional)
ITEM
1
2
3
4
5
6
CAUSE
1. De-pressurization Fault: The tower
designated for regeneration does not
de-pressurize below 7 PSI within a
designated time period immediately
after the designated purge valve is
energized.
2. Re-pressurization Fault: The previously
regenerated tower that switches to
drying does not pressurize above a high
pressure set-point within a designated
time period.
1. Right & Left Tower pressure values are
below 80 PSI prior to initiating dryer
operation.
2. Pressure of the drying tower falls below
80 PSI after the tower shift has been
completed. The alarm will be triggered
if the pressure value remains below 80
PSI for 10 seconds continuously.
Pressure value of regeneration tower rises
above 7 PSI after the de-pressurization
step is completed.
(Regeneration tower pressure should be
below 7 PSI.)
Filter element clogged and activates either
pressure switch or pressure transducer.
Filter element clogged and activates either
pressure switch or pressure transducer.
Alarm is triggered if the temperature of
the compressed air exceeds the set-point
value established in the technician mode.
Continues
To Operate
X
X
X
X
Stopped /
Paused
Paused
Stopped
Paused
Paused
Alarm
Contact
Activated while
alarm condition
is true
Activated while
alarm condition
is true
Activated while
alarm condition
is true
Activated while
alarm condition
is true
Activate while
alarm condition
is true
Activate while
alarm condition
is true
Activated while
alarm condition
is true
RECOMMENDED ACTION
1. Troubleshooting Sequence:
a. Verify operation of purge valve. Use
test button on control air solenoid to
verify operation.
b. Inspect and verify control air solenoid
valves are functioning properly & pilot
air lines are not clogged.
c. Verify pressure transducer readout
values. Values should read close to
gauge values.
d. Inspect muf
fl
ers for clogging. Proper
safety procedures must be followed
when servicing muf
fl
ers.
e. Inspect control air
fi
lter regulator and
verify element is not clogged.
2. Verify the following:
a. Appropriate purge valve is closed.
b. Inspect and verify control air solenoid
valves are functioning properly & pilot
air lines are not clogged.
c. Pressure transducer readout matches
tower pressure gauge values.
d. Repress valve is operating properly
(-100
o
F PDP) applications only.
e. Inspect control air
fi
lter regulator and
verify element is not clogged.
1. Dryer must be allowed to pressurize prior
to starting the dryer sequence.
2. The check valves should be inspected
and the system pressure should be
veri
fi
ed.
a. Restart dryer after pressure values
have been veri
fi
ed. The dryer will
restart from the initial step.
1. Shut-down dryer and follow proper safety
precautions.
2. Inspect & replace muf
fl
ers.
3. Restart the dryer and verify regenerating
tower pressure is below 3 PSI.
1. Shut down dryer and follow proper
safety precautions. System must be de-
pressurized prior to servicing.
2. Inspect & replace
fi
lter elements.
3. Restart the dryer and verify alarm is
resolved.
1. Shut down dryer and follow proper
safety precautions. System must be de-
pressurized prior to servicing.
2. Inspect & replace
fi
lter elements.
3. Restart the dryer and verify alarm is
resolved.
Inspect air compressor after-cooler and
blower for cooler. Clean if clogged. High inlet
temperatures will reduce dryer performance.
CONTROL SEQUENCE ACTION
7.6 ALARM STATES
For dryers equipped with NEMA 4/Digital Controller option
