Table of Contents
Advertisement
CST-drive mode logging
12.10 Miscellaneous
Miscelaneous
Speed feedback
Total battery current
Drive motor error
Speed feedback: This shows a graph over the
speed signal out from the drive motor.
The function is such that when driving the machine
forwards or in reverse, CCU control the motor with
an analog signal 0 to 5V. This signal goes to the
drive motor, which has electronics integrated in the
motor. The drive motor increases rotational speed
depending on the analog input signal. When the
motor is rotating, the electronics inside the motor
measures the frequency of pulses it receives for
each revolution the engine makes. The motor has
three Hall sensors to indicate rotor position. It is
pulses from these sensors that are converted to a
voltage by the drive motor electronics, and it is this
voltage that is read by CCU and, as seen in this
graph, Motor Speed Feedback.
The motor sends approximately 0.85V at 1000
RPM to CCU and the maximum speed the ma-
chine attains is when 1.85 V is received from the
motor as shown in this graph. The signal is so that
it can be seen when driving and then read the rpm
of the motor in operation. If this signal is missing
when driving, the fault must be located, the signal
comes from the drive motor via a yellow lead that
goes to CCU connector B:1. The cables to from
the motor to CCU go directly from the drive motor
without splices to CCU so there cannot be many
faults in that cable. The drive wheels must be
raised so that the drive motor can be run while this
yellow signal is measured to find out if there is a
voltage in the cable. Use a multimeter set to volt-
age to take a reading of the voltage in this yellow
lead while the machine is being driven so that the
wheels are rotating.
If everything is OK, you should get approximately
1.8 V on the yellow cable when driving at full
speed. You can attempt to make contact with the
yellow lead by inserting a thin wire through the
rubber in the same grommet the yellow cable
goes through, and with the help of this wire, make
contact with the receptacle inside the connection,
take a reading on between the wire and GND. If
the motor is in working order and a signal is not
detected here, the fault is probably inside the drive
motor and this is not possible to repair.
122
English –
0V
0
12.11 Total Battery Current
This graph shows the current flowing out from the
machine to the various consumers, this signal is
used if version 1 of the cutting motor control is fit-
ted and savE mode has been activated.
CCU measures the current by measuring the volt-
age drop across the cable running between the
battery minus terminal and the common minus
(GND). If the current (voltage drop) exceeds a
certain level when mowing and driving the machine
in savE mode, the machine's propulsion power will
start to decrease so that the machine slows down
when the current is high. Slowing down the ma-
chine will reduce the load on the cutting motors.
As the current drops, the drive motor will be
re-engaged and machine speed will increase. If
there are problems with this savE function and old
cutting motor controls are being used, the problem
probably is due to this measurement of current
consumption in the machine being out of order.
If there is a large voltage drop across this cable,
CCU thinks that it is putting out a high current
all the time and when driving in savE mode, the
machine will run very slowly all the time. If the volt-
age drop across the cable is too low, the machine
will not slow down if there is a heavy load on the
cutting deck when running in savE mode. This
graph showing the current taken from the battery is
a help in troubleshooting the savE mode function
when it is faulty.
Advertisement
Table of Contents
Troubleshooting
