McHale Fusion 2 electronic control system section
11- 8
McHale Fusion 2 round baler wrapper technical service manual
Issue 1: 0208
11.2.8: PWM constant current module
Function
The Pulse Width Modulation constant current module is
connected between the control box and the proportional
hydraulic valve. It’s purpose is to stabilise the slow
speed against voltage and temperature variations.
It’s supplied with a constant 12 Volt supply and a
variable rotate PWM signal from the control box. It
monitors the current through the solenoid valve by a
sensing resistor in the ground circuit and keeps the
current through the valve at the desired level.
Testing
There is no simple test for the PWM module except by
substitution with a known good module.
However by referring to the forward rotate circuit
diagram the 12 Volt supply and rotate forward signal
can be checked.
Connections
1 = black, 2 = blue, 3 = yellow,
4 = red, 5 = white, 6 = green.
Function
The net cut sensor is a reed sensor that closes when the
net cut knife has tripped.
In an Auto cycle closing of the sensor triggers the transfer
part of the cycle.
If this sensor does not close within 20 seconds of the net
feed clutch energising it assumes that there is a net error
and it displays the ‘Net?’ error message on the control
box.
The net cut sensor must be closed to allow the transfer of
a bale.
Testing
This sensor can be monitored from within the Input/
Output test menu.
The sensor closes when a magnet is placed close to it’s
front face, less than 25 mm.
See Input/Output test section 11.8 and Sensor testing
section 11.4 .
11.2.9: Net Cut Sensor
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