Technical Reference Manual-XPM3m Revision Date: August 2014
FAN CONTROL OVERVIEW
1) POWER SOURCE: 3 Phase power is provided to either the line terminals of the Fan Contactor (K13), the
primary side of the INVERTER, the 3 phase Fan transformer, or the 3-phase line filter depending on the Oven
options and Operating Voltage.
2) CONTROL ELEMENTS:
a) Fixed Fan Speed Ovens:
FAN CONTACTOR (K13) coil is energized by I/0 Board Output Relay A1-K5, K13’s contacts close, 3 phase
power is permitted to flow to/through the Fan CIRCUIT BREAKER(s). (F41 for all upper Fans & F42 for all
lower Fans) to the Fans for Full-Speed On/Off Control.
b) Ovens with Blower Speed Control: FAN CONTACTOR (K13) does not exist. I/0 Board Output Relay A1-
K18, in this case, serves as the Enable input to the INVERTER. An analog (modulated) Low Voltage D.C.
output from the CONTROLLER signals the INVERTER to vary it’s output frequency to the Fans, resulting in
variable-speed Control of the Fans.
3) FANS:
The FAN MOTORS are Open Frame, 3 Phase, 50/60 Hz, 1/6 Hp, 2800-3400 RPM @ rated frequency,
continuous duty.
To Next Page
Loading...
