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support@edgeovens.com Technical Support: +1 (724) 628 3050
SERVICE
The frequency drive converts single phase power to three phase power. The drive will
produce an output voltage with the main fan motor disconnected.
1. If the VFD is not powering up, verify MAINS voltage is present across the L1/L2/N
terminals (will vary by model). If voltage is present, replace the frequency drive.
2. If the voltage is missing, begin troubleshooting back to the 10A breaker and R1
relay. A ashing ‘SP’ on the VFD display indicates ‘Start Pending’. This will require
an EXPORTED logle for further diagnosis.
VARIABLE FREQUENCY DRIVE
PART FAILURE VERIFICATION
CONTROLS AND ASSEMBLIES (CONTINUED)
1. If power from the variable frequency drive (VFD) has been veried, as detailed in the
preceding article, VARIABLE FREQUENCY DRIVE, verify the resistance across the
motor windings with the motor connector unplugged. Blue to Red, Blue to Black, and
Black to Red. The resistance should be approximately 8 Ohm.
2. Lastly, measure the resistance from each of the wires to the bare motor case, to
ensure the motor is not shorted to ground. The resistance should measure innite or
open. If the motor measures out of spec, replace the motor.
MAIN FAN, MOTOR (3/4 HP, 3PH)
The Thermocouple is located between the bottom nger 2 & 3 (or 4 & 5 on S & 70” models). The baking chamber
will be slightly lower than the displayed temperature, due to the point of measurement. A 10°F offset is used in the
control to decrease this variation. The thermocouple extension junction should be cleaned prior to verication.
THERMOCOUPLE
FIGURE 4-50 FIGURE 4-51
8 FINGER OVEN (4 TOP & 4 BOTTOM) 16 FINGER OVEN (8 TOP & 8 BOTTOM)
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