Long Name:

Applies to:

Description:

This is the threshold used to control the drum vacuum generator. The dvac generator is turned on if vacuum is below (dvgt - 15) and turned off if above (dvgt + 15). A warning E_ALE_DVAC_GENERATOR_FAIL is send if vacuum is below (dvgt -30) and dvac generator is disabled for the current plot. Ideally, the dvac generator should be turned on intermittently for 1/4 to 1/2 of the imaging time during plotting.

Type:

Default:

• 470

Range:

• 400 to 1023

Notes:

The following is the installation and testing procedure of the vacuum generator:

Before installation:

• Make sure the firmware version is compatible. Use command "list version" to list the firmware version. It should display "MPE Firmware Version X.XX" in the first couple of lines where X.XX should be 1.10 or above in order for the drum vacuum generator to work. If the firmware version number is below 1.1, upgrade to the latest firmware version according to the latest Thermal Trendsetter Spectrum MPE Firmware Release Notes.
• Make sure the vacuum sensors are properly calibrated. This can be verified by using command "dvac" and check the "null adc offset" value which should be around 100. If calibration is not done, please do so according to the Thermal Trendsetter Spectrum MPE Firmware Version 1.1 Release Notes.

After installation:

• After the DVAC generator hardware has been installed, type "set alproof dvgi 1" followed by "nvs save alproof".

Testing procedure:

1. Load a 4-up carrier onto the drum by using command "pload c 1"
2. Load a 4-up receiver by using command "pload r".
3. Load a 4-up donor (any color) by using command "pload d 9".
4. Wait 1 minute while the drum vacuum builds up.
5. Turn off the drum vacuum pump by using command "dvac off".
6. Turn on the drum vacuum generator by using command "dvac generator on".
7. Read the drum vacuum level by using command "dvac". The pressure level should be able to stabilize above 615 units. If not, check the hosing for leakage.
8. If no leakage in hosing is found, than the the dvac generator threshold (alproof dvgt cal) need to be adjusted. This should only happen on high elevation customer sites.
9. The dvac generator threshold should be set to 15 units below the stabilizing level but should be above "proof dvrt cal".
10. After the test is done, type "dvac on", "dvac generator off", "punload d", "punload r" to return the machine to normal state.

Partition:

See Also: