Rapid-Air PALLET MASTER (PMD): PMD35 & PMD50. 115VAC, 1PH, 60HZ - Manual (Page 11)

Rapid Air Corporation
TAUT STOCK
The TAUT STOCK feature monitors the loop between the PMD and the external
equipment. If the loop gets small enough to possibly cause damage to the PMD,
the interface contacts change state and stops the PMD.
If it is desired to monitor the PMD, then the following write up will explain how
to connect and adjust this feature.
The TAUT STOCK feature is built into the Rapid-Air board #69100035 and
wired to external terminals 7-8-9. The terminal #9 is common and from terminal
8 to 9 is a normally closed contact with power on the unit. Terminal 7 to 9 is a
normally open contact with power on the unit. These contacts are from “relay 2”
chip. See diagram. This relay has to be in place for taut stock to work. There is
also a 4 prong post labeled “JUMP” that has to be connected so that relay 2 can
be activated. To correctly apply the jumper, locate the post and then locate the
plastic 2 prong jumper. Insert the jumper so that the left 2 vertical posts are
covered. Once this is in place, the taut stock feature can be tuned.
To tune the taut stock, check that there are no connections on the terminals 7-8 &
9, except those that were factory connected. Attach an OHM meter to terminal 9
& 7 with the meter set to OHMS.
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