Product

Magnus VLFs

Component

Load table/engine.

Error

Registration problems.

Cause

EnableRegCheck parameter needs to be adjusted.

Solution

The EnableRegCheck parameter is used to control some options when the plate registers against the registration pins on the drum. The parameter is a 3-bit field that defines the registration options. The possible values for EnableRegCheck are 0 (binary 000) through 7 (binary 111), although this parameter is normally set to 6 (binary 110).
A setting of ‘6’ (binary 110) enables Post preload reg check and Handoff to engine reg check. LEC off reg check is disabled. Refer to the table below.

Registration check	Failure error	EnableRegCheck contribution	Binary
LT searching for registration	40243	0 (this check cannot be bypassed)	000
LEC off reg check	40735	1	001
Handoff to engine reg check	40727	2	010
Post preload reg check	40514	4	100

LT searching for registration: This option is always enabled. This simply means that the load table traveler will move the plate to the registration pins during loading until an electrical contact is made.
Post preload reg check (bit 2): This will check for registration after the load table applies the preload (mhauto loadtablepreloaddistance) during loading.
Handoff to engine reg check (bit 1): This is checked immediately after the post preload check and it confirms that the plate is still in contact with the registration pins.
LEC off reg check (bit 0): This will check for continuous electrical contact of the plate across the registration pins as the leading edge clamps close. A setting of ‘6’ will leave this option disabled. In most cases it is preferable to leave this disabled to prevent nuisance registration errors as the clamps close.

Sample

Sample load sequence
LT searching for registration check:
f 04Feb08 08:16:31.699: D MDH: [LoadTable] LoadTable: 'Move' Complete
f 04Feb08 08:16:32.199: E MDH: REG_Drive0: 1
f 04Feb08 08:16:32.199: E MDH: REG_Drive1: 0
f 04Feb08 08:16:32.199: E MDH: REG_Drive2: 0
f 04Feb08 08:16:32.199: E MDH: REG_Sensor0: 0
f 04Feb08 08:16:32.199: E MDH: REG_Sensor1: 0
f 04Feb08 08:16:32.199: E MDH: REG_Sensor2: 1
Post preload reg check:
f 04Feb08 08:16:32.214: S MDH: (ID:75) Load table jog the preload distance
f 04Feb08 08:16:32.214: E MDH: Preload distance = -1.000
f 04Feb08 08:16:32.214: S MDH: (ID:75) Load table jog
f 04Feb08 08:16:32.214: E MDH: Distance = -1.000 mm
f 04Feb08 08:16:32.246: D MDH: [LoadTable] LoadTable: 'Move' Command Sent
f 04Feb08 08:16:32.277: D MDH: [LoadTable] LoadTable: Start Command Sent
f 04Feb08 08:16:32.417: D MDH: [LoadTable] LoadTable: 'Move' Complete
f 04Feb08 08:16:32.417: E MDH: (ID:75) Loadtable Load: Verify Registration
f 04Feb08 08:16:32.417: S MDH: Load table verify registration
f 04Feb08 08:16:32.417: E MDH: (ID:75) Loadtable Load: Start next sequence
f 04Feb08 08:16:32.417: D MDH: Creating a control message (MDH Task 3, Control ID 5316)
f 04Feb08 08:16:32.417: E MDH: (ID:75) Loadtable Load: Wait for registration confirmation
f 04Feb08 08:16:32.449: D MDH: Processor State check done
f 04Feb08 08:16:32.449: D MDH: Engine received a new message
f 04Feb08 08:16:32.449: D MDH: Engine processor state changed to 1
f 04Feb08 08:16:32.449: D MDH: Engine command received 7675
Handoff to engine reg check:
f 04Feb08 08:16:32.449: E MDH: (ID:75) Engine Load: Verifying plate registration
f 04Feb08 08:16:32.449: S MDH: (ID:75) Verifying registration continuity
f 04Feb08 08:16:32.449: C MDH: Using registration pins 1 and 4 for plate 1
f 04Feb08 08:16:32.449: E MDH: Registration exists at 500028.860 s
f 04Feb08 08:16:32.449: S MDH: Media on loadtable check
f 04Feb08 08:16:32.449: E MDH: (ID:75) Engine Load: Verify registration continuity
f 04Feb08 08:16:32.449: S MDH: Checking for registration continuity
f 04Feb08 08:16:32.449: E MDH: Registration block contact exists at 500028.860 s
f 04Feb08 08:16:32.449: E MDH: Registration exists at 500028.860 s
LEC off reg check (normally disabled):
f 04Feb08 08:16:32.449: D MDH: Setting drum current to 5.000 A
f 04Feb08 08:16:32.449: E MDH: Closing the LEC clamps
f 04Feb08 08:16:32.449: D MDH: Creating a control message (MDH Task 4, Control ID 5306)
f 04Feb08 08:16:32.449: C GIM: Image ID75: Image status='IMAGE_STARTING', GUI
status='WAITING_FOR_PARAMETERS'
f 04Feb08 08:16:32.808: E MDH: Registration block contact lost at 500029.240 s
f 04Feb08 08:16:32.824: E MDH: Time Contact Registration
f 04Feb08 08:16:32.824: E MDH: -----------------------------
f 04Feb08 08:16:32.824: E MDH: 500028.870 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.880 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.890 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.900 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.910 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.920 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.930 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.940 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.950 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.960 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.970 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.980 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500028.990 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.000 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.010 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.020 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.030 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.040 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.050 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.060 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.070 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.080 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.090 TRUE TRUE
f 04Feb08 08:16:32.824: E MDH: 500029.100 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.110 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.120 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.130 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.140 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.150 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.160 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.170 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.180 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.190 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.200 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.210 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.220 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.230 TRUE TRUE
f 04Feb08 08:16:32.839: E MDH: 500029.240 FALSE TRUE
f 04Feb08 08:16:32.839: E MDH: (ID:75) Engine Load: Verify LEC closed
f 04Feb08 08:16:32.839: S MDH: (ID:75) LEC off
f 04Feb08 08:16:32.839: D MDH: Setting drum current to 5.000 A
f 04Feb08 08:16:32.917: E MDH: (ID:75) Loadtable Load: Continue

As the clamps close, the status of the registration contacts are sampled every 10 ms. In the above sequence, the registration contacts were “TRUE” all the way to the end. Sometimes this will show “FALSE” for the last 10-20 ms. If the log file shows “FALSE” for more than the last 30 ms as the clamps close, it indicates a registration problem is developing. This can result in plate bubble near the clamps (out of focus areas or focus learn failures) or problems with registration on press. Refer to Registration errors troubleshooting on TechPlanet.

See also

Registration errors

Technical contact(s)

Al Edge

Submitted by

Al Edge

Date submitted

06 Feb 2008