Nordson 107 041A, Руководство пользователя

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Troubleshooting
6-24
E
1996 Nordson Corporation
All rights reserved
107 041A
Issued 1/96
Manual 12-28
Problem Possible Cause Corrective Action
4. Lack of zone control or
zone circuit breaker trips.
Bad SCR feedback card or SCR card Access OPEN LOOP CONTROL
SCREEN menu. Refer to
Changing to
Open Loop Control in this section.
Verify that value in ZERO column for
each zone is as follows:
Zone
Oven Service
value line voltage
500 – 2000 208 VAC oven
500 – 3900 380 VAC oven
500 – 3900 420 VAC oven
500 – 3900 480 VAC oven
If values in zero column are not within
above range, turn the oven off. Replace
SCR feedback card of zone.
If values in zero column are within the
above range, check for 12 VAC at
position 2 of SCR feedback card’s IDC
connector. If voltage is present at
connector, perform problem 3 of
Power
Supply Problems.
If no error occurs during power up, turn
off oven.
See Figures 6-1 and 6-5. Check for
opens and shorts in ribbon cables from
SCR card to SCR feedback card.
Repair as necessary.
If no short or open is found in cables,
enter a zone wattage setpoint of 300. If
zero column value is below 1000,
replace the SCR feedback card.
Bad SCR feedback card or SCR card If ACTUAL column contains no value or
a value below 700 watts, remove ribbon
cable connector from SCR feedback
card. Use an oscilloscope to verify that
a continuous square wave is present at
pins 1 and 2 of SCR feedback card
connector.
If no square wave is present, turn the
oven off. Replace SCR feedback card.
If square wave is present, turn the oven
off. Replace the SCR card.
Turn oven on. Perform step 4 in
Changing to Open Loop Control.
Zone Problems
(contd)