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Section 4.3 PTO CONTROL WITH OVERSPEED PROTECTION
"PTO overspeed protection" can be achieved by using the upper disabling engine limit on the APCM. The PTO
output driver will be turned off whenever the actual engine RPM exceeds programmed upper limit. Keep in mind
the RPM values are engine speeds and proper conversion to PTO speed is necessary (refer to table below). If the
upper limit is programmed below normal engine idle speed (~650 RPM), the PTO output will not function.
Step 1 Program the PTO upper limit.
1. Go to main programming mode, press and hold [RPM CONTROL], [CHARGE PROTECT] & [FORD]
keys
2. Go to the Menu 4 by pressing the [FORD] key 3 times. "RPM" blinks in the upper right hand corner.
3. Adjust the RPM value with [ARROW] keys to the desired maximum allowable engine speed for PTO
mode.
4. Save and exit programming mode by pressing the [FORD] key twice.
Step 2 Activate the PTO Control output.
• Press [PTO CONTROL] key on the module
» Light next to PTO Control key turns on
» PTO output driver turns on (connected to auxiliary load)
Exiting PTO Control mode
PTO Control mode will be exited if the engine speed exceeds the programmed upper limit.
PTO Control mode can always be exited by pressing the [PTO CONTROL] OR [POWER] keys.
Recommended maximum PTO operational speeds for F-Series with 4R100 PTO Provision
Formula: 4R100 PTO Speed ÷÷ PTO Ratio = Engine Speed
PTO Type Maximum PTO
Operation Speed
PTO Gear
Ratio
Upper Limit
(Engine Speed)
Chelsea 242 or 244 3000 1.52
1974
Muncie FA Series 3337 1.335
2500
These values are provided for convenience. Refer to the Power Take-Off manufacturer's owners guide for latest specifications.
PTO
CONTROL
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