Technical Reference
Manual-XPM3m Revision Date: August 2014
TEST PROCEDURE FOR HEATER GROUND CONTINUITY
1) Disconnect the main power connection to the oven and disable all heater circuit breakers.
2) Check each line to the respective heater element for a short to ground using an Ohmmeter.
3) The heater element conductors should be completely isolated from ground (i.e. open circuit with reference to
ground).
MAXIMUM HEATERS ON
The Oven Control Program limits the maximum number of heaters to be energized at the same time to seven for
most customers. Some customers have special requirements that require more than seven heaters to be energized
at one time. This special requirement increases the machine current draw, and this current rating is noted on the
machine identification tag.
MAXIMUM PHASE IMBALANCE
The difference between the maximum loaded phase and the minimum loaded phase is limited to two heaters by the
Oven Control Program.
The Oven Control Program limits the number of heaters “ON” at the same time for each phase.
THERMOCOUPLES
All thermocouples in the oven are type 'K', and identified by a red (-) and a yellow (+) wire. Connectors, wires and
terminals must be designated for use with type “K” thermocouples.
Test procedure
1) Remove the thermocouple connection block from the front of the AI board in the Anafaze controller.
2) Measure the resistance of each thermocouple using an Ohmmeter
. (All T/Cs have one side connected to
ground.For best results, isolate the T/C being tested).
3) The resistance of a thermocouple wire should be approximately 5 ohms.
4) Test for shorts between the thermocouple wires by disconnecting the thermocouple cable from the plug on the
outside of the cell.
5) Measure the resistance between the two thermocouple wires; it should be open circuit with the connector
removed from the front of the controller.
6) Check for short circuit to ground on both thermocouple wires.
7) Wiring connections must be tight. Verify that all negative thermocouple connections are grounded, along with
all unused thermocouple ports on the front of the controller.
8)
Check to determine that one side of the TC probe is NOT common to ground
.
