General information
Depending on the execution which is required, the various input conditions and output functions for the PSM control unit may be set to yes (Y) or no (N). The functions set to (Y) at the control unit output are executed only if all conditions set to (Y) at the control unit input are satisfied depending on the corresponding logical links.
Input:
010 Request for PTO 2 (pin X3 15/5)
Via the switch request power take-off 2 the PSM control unit receives the signal at the input pin X3 15/5
Power take-off 2 requested.
Limp-home mode
The input pin X3 15/5 cannot be monitored; the information at the input is made available without checking.
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020 Request for PTO 2 via body electronics (AUF)
PTO 2 can also be requested via the body electronics.
030 Request for PTO 2 via trailer electronics (ANH)
PTO 2 can also be requested via the trailer electronics.
040 Last engagement condition to be fulfilled (input condition)
Applies for parameters 010, 020 and 030.
The parameterization can determine whether the PTO 2 request is to occur as a last event or whether no particular input condition sequence is specified.
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050 Neutral position
The PSM control unit receives the signal regarding the transmission neutral position over the vehicle CAN bus.
If the signal from the vehicle CAN bus is not available, the PTO display flashes and the power takeoff cannot be engaged. Via further actuation of the Request for PTO 2 switch, this safety check is skipped, and the PTO is engaged.
060 Parking brake
Via the vehicle CAN bus, the PSM control unit receives the "parking brake actuated" signal. If the parking brake is not engaged, the "Engage parking brake" symbol is displayed on the matrix display in the case of models 950, 952, 953, 954, 957. If the signal from the vehicle CAN bus is not available, the PTO display flashes and the power takeoff cannot be engaged. Via further actuation of the Request for PTO 2 switch, this safety check is skipped, and the PTO is engaged.
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Models 970, 972, 974, 975, 976
In equation 430, parameter 010, parameterize display parking brake symbol to NO.
Model 950, 952, 953, 954, 957
In equation 430, parameter 010 parameterize display parking brake symbol to YES.
070, 080 Speed threshold
Via the vehicle CAN bus, the PSM control unit receives the current speed value.
If the current instantaneous vehicle speed is less than the parameterized max. vehicle speed threshold, the function is executed.
If the signal from the vehicle CAN bus is not available, the PTO display flashes and the power takeoff cannot be engaged. Via further actuation of the Request for PTO 2 switch, this safety check is skipped, and the PTO is engaged.
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090 Tacho signal 'ZERO'
Via the vehicle CAN bus, the PSM control unit receives the information that the vehicle is stationary.
If the signal from the vehicle CAN bus is not available, the PTO display flashes and the power takeoff cannot be engaged. Via further actuation of the Request for PTO 2 switch, this safety check is skipped, and the PTO is engaged.
100, 110 engine speed threshold
Via the vehicle CAN bus, the PSM control unit receives the current engine speed value.
If the instantaneous engine speed is less than the parameterized max. engine speed threshold, the function is executed.
If the signal from the vehicle CAN bus is not available, the PTO display flashes and the power takeoff cannot be engaged. Via further actuation of the Request for PTO 2 switch, this safety check is skipped, and the PTO is engaged.
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120 Idle throttle
The PSM control unit receives the information "Accelerator pedal not actuated" over the vehicle CAN bus.
If the signal from the vehicle CAN bus is not available, the PTO display flashes and the power takeoff cannot be engaged. Via further actuation of the Request for PTO 2 switch, this safety check is skipped, and the PTO is engaged.
130 Lower level (NR/WR) reached
Via the vehicle CAN bus, the PSM control unit receives the information "Lower level reached".
If the signal from the vehicle CAN bus is not available, the PTO display flashes and the power takeoff cannot be engaged. Via further actuation of the Request for PTO 2 switch, this safety check is skipped, and the PTO is engaged.
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140 Emergency operation (GS) not actuated
Via the vehicle CAN bus, the PSM control unit receives the information "Emergency running mode not actuated".
If the signal from the vehicle CAN bus is not available, the PTO display flashes and the power takeoff cannot be engaged. Via further actuation of the Request for PTO 2 switch, this safety check is skipped, and the PTO is engaged.
150 FCAN event
An FCAN event may be selected as an additional input condition for engaging the PTO.
The result of the vehicle CAN event can be reversed (inverted), and its threshold value can be set (parameters 160-180).
190 Feedback with PTO 2 (pin X3 15/8)
Via the input pin X3 15/8, the PSM control unit receives the information that PTO 2 is engaged.
If the PTO 2 solenoid valve is initialized, and no feedback is received within 5 s:
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1 With clutch open
- the initialization of the solenoid valve is withdrawn for 1 s
- the solenoid valve is initialized again.
If feedback is still not received after another 5 s,
- a fault code is set,
- the PTO 2 feedback is regarded as active and
- the PTO general lamp is activated.
2 If the clutch is closed or a clutch signal absent
If feedback is still not received after another 6 s,
- a fault code is set,
- the PTO 2 feedback is regarded as active and
- the PTO general lamp is activated.
200 PTO drive function
Models 950, 952, 953, 954, 957 only
If a PTO is not wired over the PSM, the PSM control unit is notified that PTO 2 is engaged by the instrument (INS).
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Output:
500 Initialization of the solenoid valve for PTO 2
If the input conditions have been fulfilled, the outputs are initialized.
Via the output pin X4 18/17 the solenoid valve Y47 is initialized; the solenoid valve picks up and engages PTO 2. The power takeoff remains engaged until it is switched off with the PTO 2 switch or by turning the ignition off.
The clutch can be activated via the accelerator pedal lock output pin X4 18/11 and
pin X4 18/12 clutch initialization (with HPS) or via vehicle CAN bus clutch initialization (in vehicles with EAS) in order to engage the PTO. On actuation of the PTO request switch, the output pin X4 18/11 clutch pedal interlock and pin X4 18/12 clutch initialization is initialized by the PSM control unit, or a clutch request is transmitted to the clutch control system via the vehicle CAN bus.
After the PTO has been engaged and feedback has been received, the output pin X4 18/11 clutch pedal interlock and
pin X4 18/12 clutch initialization are no longer initialized, or the clutch request to the clutch control system is withdrawn.
The working speed is requested via the vehicle CAN bus.
If parameterized, the
- splitter group,
- gear interlock,
- engine brake lock,
- min./max. rpm limitation,
- torque limitation and the
- rpm limitation
are output via the vehicle CAN bus.
When switching off the PTO the output
Pin X4 18/11 clutch pedal lock-out and pin X4 18/12 clutch actuation are actuated or the clutch request is output via the vehicle CAN bus, until the PTO 2 feedback signal is no longer present (max. 4 s).
Models 950, 952, 953, 954, 957 only
Prior to the initialization of the solenoid valve for PTO 2 the following procedure occurs:
510, 520 Threshold of transmission input speed
The transmission input speed is observed via FCAN. If this falls below the threshold value, the solenoid valve for PTO 2 is initialized.
A time window is simultaneously started:
530 Waiting time after clutch opening
Regardless of the transmission input speed, on the expiry of the parameterized time at the very latest, the clutch is regarded as open, and the solenoid valve for PTO 2 is initialized. This ensures that, even in the case of a poorly separating clutch, the engagement of the PTO is achieved within an acceptable time.
Transmission input speed
Waiting time after opening of clutch
Output
Solenoid valve initialization (PSM internal)
Initialization of the solenoid valve for PTO 2 (pin X4 18/17)
AND
OR
Models 970, 972, 974, 975, 976 only
As no information regarding the transmission input speed is available here, initialization is carried out as follows:
540 Wait until clutch opens
The PSM control unit receives information regarding whether the clutch is open over the vehicle CAN bus.
If the input conditions have been fulfilled and the clutch opened, the solenoid valve for PTO 2 (pin X4 18/17) is initialized.
Emergency running
If the clutch open signal is not available, the clutch is regarded as open after 5 s.
Solenoid valve initialization (PSM internal)
Initialization of the solenoid valve for PTO 2 (pin X4 18/17)
Output
Wait until clutch opens
AND
Note speed and torque limits of the installed PTOs and adhere to them.
550, 560 Min. rpm limitation for PTO 2
570, 580 Max. speed limit with PTO 2
590, 600 Torque limitation with PTO 2
With these settings, the delimitation of an operating range, in which the function is still guaranteed and the PTO is protected against overload, is possible.
610, 620 Speed limit with PTO 2
This parameter enables rpm limitation
when PTO 2 is engaged.
630 Activation of the output (pin X4 18/13)
This parameter enables the connection of any function with the engagement of PTO 2 via relays (e.g. shutoff of auxiliary heaters, compulsory lowering of the air suspension, etc.)
Relay output max. 0.7 A.
640 ADR request
Working speed regulation is requested from equation 050.
650, 660 Splitter range
The splitter group can be evaluated and the splitter position requested via FCAN.
670 Gear lock
The gear lock can be requested via FCAN.
680 Engine brake interlock
The engine brake lock can be requested via FCAN.
690 EAS clutch initialization
In vehicles with EAS only
EAS clutch initialization can be activated over the vehicle CAN.
700 Clutch pedal interlock (pin X4 18/11)
Only on vehicles with gear control (GS)
The clutch pedal interlock can be activated over pin X4 18/11
710, 720 Clutch initialization (pin X4 18/12)
Only on vehicles with gear control (GS)
Clutch initialization can be activated via pin X4 18/12 and a delay time up to clutch initialization can be parameterized
(parameter 720).
Not until diagnosis version 5
730 Operating hours counter for power take-off 2
The operating hours for power take-off 2 are recorded by activating this parameter.
Recording takes place when the engine is running and power take-off 2 solenoid is energized.
740 Total operating hours for power take-off 2
The total number of operating hours for power take-off 2 is displayed.
750 Resettable number of operating hours for power take-off 2
The total number of operating hours for power take-off 2 since the last counter reset is displayed.
It is therefore possible to record specific working and operating hours.