9
VAC-SIF-05
Training & Maintenance Manual
CVX0260B
Parker Hannifin Corporation
Pneumatic Division
Richland, Michigan
www.parker.com/pneumatic
PlC Vacuum Signal On, Part Present Signal Changes State during Vacuum ON Cycle
Vacuum Pressure must be maintained at vacuum pressure greater than P_4.
Part may not drop, but part present signal will change state. This may cause the PLC/PC
Verify Vacuum Level
program to command the system to drop the part. Check inlet pressure during machine
cycle. Fluctuations in compressed air can cause reduce vacuum flow and pressure.
Check for system leakage.
Air Economizing Settings must be greater than part present signal settings. If this is not
n_1 > n_2 > P_3 > P_4 true, air economizing will enable system pressure to
Verify Air Economizing Settings. decay below the part present hysteresis switch point. Part may not drop, but part present
signal will change state. This may cause the PLC/PC program to command the system to
drop the part. Check Sensor settings and adjust.
PlC / PC Output ON, No Vacuum Pressure / Flow
ou1 = <NC>. Sensor Output 1 must be
If Sensor Output 1 is set Normally Open ,
set to Normally Closed, Passing when
<N.O.>, no signal will be passed through the
Vacuum is off, 0 inhg.
sensor to activate the vacuum pilot from the
PLC/PC. Program Sensor Output 1 (ou1)
to <N.O.>.
Manually changing sensor OU1 from <N.C.> to
<N.O.>. LED should change state. See Sensor
Verify Sensor Output 1 settings
Programming for changing Output status.
Verify that Sensor Output LED 1, Red
IF Yes – Sensor is working, but change of signal
LED, turns OFF and ON (OFF indicates is not communicating to the PLC/PC. Check
a <NC>, ON indicates <NO>
Wiring and Programming. Save in <N.O.)
setting.
IF No – Sensor is not working. Change Sensor
(MPS-V23C-NC replacement part number).
Save in <N.C.) setting.
Light On indicates a signal is being
sent from the PLC/PC and is passing
PLC Signal is communicating
through Sensor Output 1 to the
to Solenoid Connector. Check Connector.
Solenoid Connection.
Check Solenoid LED connector
Use the Manual overrides on the solenoid pilots
to verify electrical signal to the
to test air system. If the generator creates
solenoid pilot valve.
Light OFF indicates a signal from
vacuum, no signal communication to the
PLC/PC is not communicating with
vacuum pilot valve. Check that sensor OU1 =
Vacuum Solenoid Valve.
<N.C.> , at 0 inhg. If OU1= <N.O.>. Change
sensor programming. Verify PLC programming.
Verify Output Power. Verify Input Power.
Without Compressed Air, no
Check to see if any system lock out valves is in
Check Supply Pressure
vacuum flow will be created.
closed or exhaust conditions.
Without Minimum Operating Pressure,
Check Regulator Setting on inlet pressure port.
Degree of vacuum will be reduced.
Technical Information
