Technical Reference
Manual-XPM3m Revision Date: August 2014
SMEMA - continued
Software operation.
The XPM3m has 2 user settings for the SMEMA option, Infeed delay and Outfeed alarm delay.
The infeed delay setting provides a delay in board travel inches between each circuit board introduced into the oven
by delaying when the oven ready to upstream signal is switched back on after a board is introduced into the oven.
The outfeed alarm delay setting is to provide a delay for a transfer conveyor or board stacker on the off-load of the
oven to provide a down stream ready signal to the oven. This setting is to allow more boards to be introduced into
the oven while ignoring the downstream ready signal for a set delay. If a downstream ready signal remains absent
beyond this delay setting then the oven clears the ready signal to an upstream conveyor to indicate that no more
boards can be accepted until the downstream conveyor is ready.
On older ovens with a PLC this delay was fixed at 30 seconds.
Note: Setting zero for the outfeed alarm delay disables monitoring for the downstream ready signal and is equivalent
to installing a jumper wire on the SMEMA off-load connector to indicate that the downstream is always ready.
The XPM3m has SMEMA settings for each lane for up to 2 lanes of SMEMA control and the SMEMA control for
each lane operates independently as it did with ovens with a PLC.
The XPM3m provides optional alarm messages to indicate that the downstream ready signal is absent beyond the
outfeed alarm delay setting when a board is exiting the oven. Also that the oven is not ready when a board is
arriving into the oven.
By installing a connector on the off-load to indicate that the downstream equipment is ready and by installing a
flashlight or light assembly on the on-load to indicate when the oven is ready to accept boards. The ready to accept
boards indicator should light when the oven is ready and when the downstream equipment is ready signal is also
present. The ready to accept boards indicator switches off as a board is detected by a corresponding on-load board
sensor and switches back on after the corresponding on-load board sensor is clear for the onfeed delay distance set
in the software.
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