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Background

This procedure is used to check the vacuum level of the picker vacuum cups and to set the vacuum threshold for the picker.

WARNING: Before working on the picker assembly, you must ensure that the safety interlock override (SIO) key switch is in the Normal Operation position with the key removed. The Override position is only to be used for observation and diagnostic purposes.

See Safety Policies for Service Engineers for details on using the SIO key switch.

WARNING: The compressed air supply must remain turned on while you are working on the picker assembly, to prevent:

• the picker from dropping by gravity
  and/or
• the picker head/vacuum cup assembly from becoming limp and difficult to work with.

If the compressed air supply is turned off while you are working on the picker, a hazard exists, because re-energization of the compressed air supply results in sudden, unexpected movement of the picker assembly, which can seriously injure any body part in its path.

If you suspect that the compressed air supply has been turned off (for example, because the picker drops by gravity and/or the picker head/vacuum cup assembly becomes limp), you must immediately stop working on the picker and close the access panel before investigating why the device or plant air supply has been interrupted. If there is a problem with the plant air supply, then lock out the device air supply until it has been restored, and keep the access panel closed until the device air supply has been re-energized. See Safety Policies for Service Engineers for details on lockout procedures.

Procedure

To measure the vacuum level of the picker vacuum cups:

1. Enter command:
   picker up
2. With no plate, enter command:
   picker vac on
3. Take note of the vac level with command
   picker
4. Open the bay door.
5. Ensure that the SIO key switch is set to the Normal Operation postion, and that the key is removed from the switch.
6. Use the smallest plate to cover the four cups that have 1/4-in. blue tubing.
7. Enter command picker again and make a note of the vacuum level.

To set the picker vacuum threshold parameter:

GMCE and TMCE devices:
Set the mhauto pvacthresh parameter as described in the firmware documentation:

• mhauto pvacthresh

MPE devices:
Set the pvt (pvac_threshold) parameters as described in the firmware documentation:

• pvt (pvac_threshold)

Technical contact(s)

Content owner: Frank van Eerdt
See the Escalation page for escalation contacts:

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Date submitted

09 Jun 2004