Nexen Electronic Over Load Protection System Controller 964403 - Manual (Page 7)

7 FORM NO. L-20309-A-1099
TROUBLESHOOTING
DANGER
Some items in the following troubleshooting table require the cover of the OPS controller to be opened with the input power on.
Only an electrican qualified to work with high voltage conditions should perform these tests requiring the cover to be open and
the power to be on since voltages of 115VAC and 230VAC may be present, depending on the input power option used.
Continued on Page 8
PROBLEM WHAT TO CHECK: WHAT TO DO:
"Activate Controller" push-button is
pressed but its indicator light does not
come on. Power to the OPS. Make sure the power is turned on at the source.
Blown Fuses (F1 and F2). With the power off, open the enclosure cover and remove
Fuses F1 and F2. Examine and replace any blown fuses. If
the fuses blow again, a short exists on the primary side of the
power supply transformer requiring replacement of the OPS
printed circuit board.
Power supply LEDs (+12VDC and
+5VDC) are on or off. With the power on, open the enclosure cover and note the
status of the green LEDs on the printed circuit board. If the
LEDs are on, replace the Activate Controller push-button. If the
LEDs are off and fuses F1 and F2 are not blown and the
power to the OPS is present at the appropriate Terminals
(Terminal block J3 for 115 or 230VAC and Terminals 7 and 8
of Terminal block J1 for +12VDC), the OPS power supply is
faulty and the OPS printed circuit board must be replaced.
After pressing the "Engage"
push-button, the indicator does not
turn on and the clutch does not
engage. Power to the OPS. Make sure the power is turned on at the source.
Blown Fuses (F1 and F2). With the power off, open the enclosure cover and remove
Fuses F1 and F2. Examine and replace any blown fuses. If
the fuses blow again, a short exists on the primary side of the
power supply transformer requiring replacement the OPS
printed circuit board.
Power supply LEDs (+12VDC and
+5VDC) are on or off. With the power on, open the enclosure cover and note the
status of the green LEDs on the printed circuit board. If the
LEDs are on, replace the Activate Controller push-button. If the
LEDs are off and fuses F1 and F2 are not blown and the
power to the OPS is present at the appropriate Terminals
(Terminal block J3 for 115 or 230VAC and Terminals 7 and 8
of Terminal block J1 for +12VDC); then, the OPS power supply
is faulty and the OPS printed circuit board must be replaced.
Relay K1 operation. With the power on, open the enclosure cover. Using a
voltmeter, measure the voltage across the terminals of J2
marked K1 COM (-) and K1 NO (+). When the OPS is
disengaged, the voltmeter should read 0VDC. When the OPS
is engaged, the voltmeter should read 12VDC. If this voltage
does not change and the OPS power supply’s green LEDs are
on, relay K1 is faulty and the OPS printed circuit board must be
replaced.
After pressing the "Engage"
push-button, the indicator turns on
but the clutch does not engage. Air pressure to the clutch. Measure the air pressure at the clutch and take appropriate
action.
Engage signal is reaching the air
valve solenoid at the clutch. Measure the voltage at terminals 5 and 6 of the clutch’s
electrical connector. There should be 12VDC across these
terminals when the OPS is engaged. If voltage is present, the
air valve solenoid is faulty and must be replaced. Since the
"Engage" push-button’s indicator is tied to the N.O. contact of
K1 and this indicator is working properly, it can be assumed the
relay is working properly. Furthermore, it can be assumed the
output signal to the air valve solenoid is present at the terminal
K1 NO on the OPS printed circuit board because the indicator
light works. Turn the supply power to the OPS off and open
the cover to the enclosure. Using an ohmmeter, check the
continuity from the K1 COM terminal of J2 to terminal 6 of the
clutch’s electrical connector. Repeat for K1 NO terminal of J2
and terminal 5 of the clutches electrical connector. Replace
the cable if continuity is faulty for either connection.
Pressing the "Disengage"
push-button fails to disengage the
clutch. The "Disengage" push-button’s
indicator remains off after depressing
the push-button. The "Disengage" push-button’s indicator is tied to the N.C.
contact of K1. If this indicator remains off while pressing the
"Disengage" push-button and the "Engage" push-button
indicator remains on, K1 is not operating properly. The OPS
printed circuit board is faulty and must be replaced.
Engage signal is working properly at
the clutch’s electrical connector. Measure the voltage across terminals 5 (+) and 6 (-) of the
clutch’s electrical connector. When the OPS is disengaged, the
voltmeter should read 0VDC. When the OPS is engaged, the
voltmeter should read 12VDC. If the measured voltages
indicate the engage signal is functioning properly, the air
solenoid valve on the clutch must be replaced.