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Revision A
Table 9.1
Combine Voltage Limits (continued)
NOTE:
Some combine models do not support checking sensor output voltage from the cab (early Case 23/2588 series,
CLAAS 500/600/700 Series). For these models, check output voltage manually. Refer to
Manually Checking Voltage Range
or
Manually Checking Voltage Range
10 Volt Adapter (MD #B6421)
–
New Holland Combines Only
1021127
A
Figure 9.3: 10 V Adapter (MD #B6421)
New Holland combines with a 10 V system require the 10 V
adapter (A) (MD #B6421) for proper calibration of the auto
header height control (AHHC) feature.
If a 10 V New Holland combine does not have the adapter
installed, the AHHC output will always read 0 V, regardless of
sensor position.
NOTE:
A 10 V adapter is not available for the optional two-sensor
system.
1020673
A
Figure 9.4: Float Indicator Box
Use a voltmeter to measure the voltage between Pin 1 (power)
and Pin 2 (ground) wires at the AHHC sensor (A). This will
determine whether the combine has a 5 V system or a 10 V
system.
NOTE:
The combine key must be in the ON position, but the engine
does not need to be running.
The three possible voltage readings are as follows:
•
0 V
–
combine key is in OFF position, or there is a faulty
harness/bad connection
•
5 V
–
standard combine reading
•
10 V
–
10 V combine reading; adapter (MD #B6421) is
required
Manually Checking Voltage Range
–
One-Sensor System
The one-sensor system is standard for the FM100 Float Module. If equipped with the optional two-sensor system, refer to
Manually Checking Voltage Range
.
The output voltage range of the auto header height control (AHHC) sensors in some combines can be checked from the
cab. For instructions, refer to your combine operator
’
s manual or the AHHC instructions later in this document.
To manually check the sensor
’
s output voltage range, follow these steps:
1.
Extend guard angle fully; the header angle indicator should be at
D
.
2.
Position the header 150 mm (6 in.) above the ground, and unlock the float.