Technical Reference
Manual-XPM3m Revision Date: August 2014
If the conveyor motor does not rotate, check the following:
Verify that the conveyor is switched on in the PC oven software.
Verify that K37 is energized and that A1-K8 is also energized.
Verify that 120 VAC is present at the G5 power supply or verify that the green LED on the front of the power
supply is on.
If 120VAC is not present then make sure that A1-K8 is energized on the A1 board, that F68 is not tripped and
that the inrush current limiter on pins 1 and 2 of connector P52 on the A1 board are intact.
Verify the analog voltage reference signal to the A42 board.
The signal should be +10 VDC between pins 1(+) and 2 (-) on connector P2 of A42 when the analog output is at
full scale.
If there is no signal present, make sure that the controller rack has +15 VDC at pin 4 of connector P26 of the A1
board. (-15 is not present or required on the new controller)
If +15 VDC is present , but the drive is not rec10 VDC, there is either a wiring error or the DI board is
faulty, or a poor wire connection.
If motor turns, but no speed is reported, check the following:
Verify that the hex drive shaft is rotating.
Verify that the sprocket installed on the hex drive shaft is also rotating.
Verify that LED2 on A42 is flashing as each sprocket tooth from the sprocket on the hex drive shaft passes by
the fork shaped sensor on A42.
If LED2 is not flashing on A42 and the hex shaft and sprocket are rotating then perform the following:
Verify the alignment of the sprocket with the fork shaped sensor on A42. The sensing area on the fork shaped
sensor is on the top most edge of the sensor and only the tips of the sprocket teeth should be extending into the
opening on the sensor. If the sprocket teeth extend too far the sensor won't detect the gaps between each
sprocket tooth and will sense the hub around the sprocket teeth instead.
If LED2 on A42 does not light or never changes state then test the following.
Verify that 5VDC is present between pins 1(+) and 3(-) of connector P3 on A42. The 5VDC is required to
operate the logic components on A42.
If the polarity is reversed or if connector P1 and P3 are reversed on A42 then A42 will have to be replaced after
the wiring has been corrected. Because reverse polarity and or 24VDC will permanently damage all of the logic
components on A42.
If 5VDC is present and LED2 on A42 still doesn't change state then perform the following:
Shut off the conveyor motor.
Unplug connector P4 from A42.
Loosen and remove the (2) 1/4-20 bolts that secure the bracket that A42 is mounted on to the front of the rail
width gearbox
.
With the A42 assembly separated from the sprocket on the hex drive shaft pass a small object back and forth
between the top most tip of the fork sensor while observing LED42 on A42.
A pen or the tip of your finger can be used.
If LED2 still does not change state and 5VDC is present between pins 1(+) and 3(-) of connector P3 on A42
then A42 is defective and needs to be replaced.
After the conveyor system has been repaired, run the conveyor calibration routine in the Oven Control Program.
