Service; Sequence Of Operation - AccuTemp XLR81B-00 Series Install, Service And Parts

1. SEQUENCE OF OPERATION

1. When power is connected to power line voltage is supplied to the three position
terminal block.
2. The white common lead from the terminal block is connected to the red "Y" harness
which one side supplies common to the power in J2-1 terminal of the circuit board.
The other side is daisy changed and connects to the common side of the heater
element harnesses.
3. The black wire from the terminal block supplies power to one side of the fuse.
4. The other side of the fuse is connected to a "Y" harness consisting of a black wire
connected to a high temp white wire.
5. Line voltage flows through the black wire of the "Y" harness and is connected to the
controller power in J2-2 terminal.
6. Line voltage is connected to the white high temp wire of the "Y" harness and connects
to position #1 (front) heater over temp thermostat.
7. Power flows through the front heater thermostat and to a white high temp wire which is
connected to position #2 (middle) heater over temp thermostat.
8. Power flows through the middle heater thermostat and to a white high temp wire which
is connected to position #3 (back) heater over temp thermostat.
9. Power flows through the back heater thermostat to a white high temp "Y" wire harness
which connects to the controller circuit board terminal J7-1 then daisy chained to J7-3
and to J7-5.
10. When the ON/OFF key is pressed to turn the unit ON, relays K1, K3 and K5 are turned
on allowing power to flow through to controller terminals J7-7, J7-4 and J7-6 then to
each heater.
11. Temperature sensing is done through three RTD sensors, front (#1) middle (#2) and
back (#3).
12. The front (#1) RTD is connected to the controller terminals J3-1 and J3-2.
13. The middle (#2) RTD is connected to the controller terminals J5-1 and J5-2.
14. The back (#3) RTD is connected to the controller terminals J4-1 and J4-2.
15. As the temperature rises and reaches the set point temperature the controller
disengages relays K1, K3 and K5 and begins to regulate temperature to the set point.
16. A timer start/stop circuit reed switch is connected to the controller terminals IN1-1 and
IN1-2.
17. When the arm is lowered a magnet engages the reed switch and closes the circuit to
the controller, starting the timer.
18. When the arm is raised beyond the magnet field the reed switch disengages and opens
the circuit to the controller, stopping the alarm or the timer if the timer is still running.
19. The timer can be disengaged from auto starting through the controller manager's
mode.
20. Controller settings and options are covered in the operator's manual.
MP5032-2104

SERVICE

XLR8 HEATED PLATEN
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