EDGE-1830 EDGE-2440 / EDGE-3240 / EDGE-2460 / EDGE-3260 / EDGE-3860 / EDGE-4460 / EDGE-3270
Original Service Manual 35 Rev 1.6, January 2021
• Turn the oven off.
• Move the iHeat DIP 8 OFF, return the previously noted iHeat DIP to ON. If you failed to make
a note: (See Chapter 6, Final adjustments for DIP settings.)
• Return oven to service.
➢ Transformer
If the transformer is suspected, test the windings before powering the oven. The secondary (yellow
wires) of the transformer will measure a between 1~2 Ohms. The primary (black/white wires) of the
transformer will be 20~30 ohms. If either winding is OPEN or SHORTED, replace the transformer.
➢ Conveyor Motor
The conveyor motor is powered and monitored by the control system. This is a 3 Phase, 24VDC motor
with Hall Effect feedback. Do not attempt to power the motor by other means. If the motor is bound,
this may indicate a gear problem and motor replacement will be required.
➢ Air Switch (3PH, 3/4HP Main Motor)
Connect a Manometer hose to the aluminum air tube which feeds the silicon air tube connected to the
air switch. Turn the oven on and measure the air pressure supplied by the tube. If 1 inW.C. or more
is present, the air switch should function. Turn off the oven. Connect the Air Switch normally. Turn on
the oven and verify 120VAC on each side of the air switch after the main fan spins up. If voltage is
present on one and not the other, replace the Air Switch.
➢ Thermocouple
The Thermocouple is located between the bottom finger 2 & 3 (or 5 & 6 on 70” models). The baking
chamber will be slightly lower than the displayed temperature, due to points of measurement. A 10°F
offset is used in the control to decrease this variation. The thermocouple extension junction should be
cleaned prior to verification. To verify the thermocouple, follow the following process:
• Allow the oven temperature to stabilize (500°F works well).
• Measure the ambient temperature of the machine control (PCB on back of the control
cabinet door). This is your “Ambient” measurement.
• Note the temperature on the display. Subtract (10) from this value. This is your
“Displayed” temperature.
• Measure the mVDC output of the connected thermocouple. Red meter lead to the
WHITE wire on P3.1, black test lead to the RED wire on P3.2. Note this measurement
as the “Measured mV” value.
• Referencing the Type-J thermocouple chart, make note of the mV DC value for the
“Ambient” you recorded.
• Add the mV values “Ambient mV” + “Measured mV” = “Actual mV”
• Again, referencing the chart, record the Temperature equivalency of “Actual”.
• “Actual” should be within 15°F of “Displayed” temperature. If not, replace the
thermocouple AND the thermocouple extension.
➢ Variable Frequency Drive
The Lenze frequency drive converts single phase power to three phase power. The drive will produce
an output voltage with the main fan motor disconnected. The output from the frequency drive is a
modulated voltage. Due to this, measurements of the AC voltage will vary depending on the features
of the voltmeter being used. It is safe to say, that if more than 120VAC is present on each of the
To Next Page
Loading...
Need help?
General
