Long Name:

Applies to:

Description:

The pvac_threshold parameter specifies the minimum allowable picker vacuum sensor reading required for the firmware to consider that a plate is being held by the picker vacuum cups. When the vacuum reading is below this value, the firmware will consider that there is no plate on the picker cups.

The PICKER command will display the vacuum sensor reading and indicate whether it is above or below the threshold specified by pvt. The al pvs parameter is used to enable or disable the picker vacuum sensor. If the sensor is disabled, then the full delay specified by aldly vac is used while waiting for vacuum to build.

Type:

Default:

• 250 (Trendsetter Autoloader prior to V1.42)
• 125 (Trendsetter Autoloader as of V1.42)
• 75 (Trendsetter NEWS)

Range:

• 0 to 1023

Notes:

This parameter should be set according to the following formula. Typically, the default value will be very close this already.

pvt = (Vp - Vnp)/2 + Vnp

pvt = pvac_threshold. Vp = vacuum reading with vacuum turned on and plate on the cups. Vnp = vacuum reading with vacuum turned on and NO plate on the cups.

For plunger-less suction cups, the vacuum level reached is lower for small plates than for larger plates. Therefore, the above calculation should be done based on the vacuum reading when the picker is holding the smallest plate to be used.

Partition:

See Also: