Club Car Precedent 2014, Maintenance And Service Manual

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13
General Information
EXCEL SYSTEM TROUBLESHOOTING: WITH
POWERDRIVE CHARGER
FEATURES
• Shunt-Wound Motor: The shunt-wound motor, unlike a series motor, is designed so that the speed controller is
able to vary the amount of current passing through the field coils independently from the current passing through
the armature.
• Motor Braking: Under certain conditions a shunt-wound motor also has the ability to act as an electrical brake to
slow the vehicle. There are two features of the Excel electrical system that will activate the motor braking function:
Walk Away Braking and Motor Braking (adjustable with the IQDM-P handset).
• Walk Away Braking: This prevents the vehicle from rolling away uncontrolled should the driver park on a slope
and leave the vehicle without locking the park brake. The vehicle will roll at about 1 to 3 mph (1.5 to 4.8 km/h).
If the walk away braking function remains engaged for two seconds or more, a warning buzzer will sound to
alert the driver that motor braking has been activated.
WARNING
• Walk Away Braking will not limit vehicle speed to 3 mph (4.8 km/h) on very steep grades. Do not
operate vehicle on slopes exceeding 20% grades.
• Motor Braking: When going down an incline with the accelerator pedal partially pressed, the motor braking function
will activate to assist the operator in maintaining a speed less than the speed setting. For example, if the vehicle is
going down an incline with the accelerator pedal pressed half way, the motor braking function will activate to assist
the operator in maintaining a speed approximately half of the speed setting defined in the Program Menu.
• Regenerative Braking : When motor braking is activated, the vehicle motor acts as a generator, slowing the vehicle
as it creates energy that is used to charge the batteries.
• Tow/Run Switch: When the Tow/Run switch is in the RUN position, the vehicle will function normally. When the
switch is in the TOW position, power to the OBC and controller is shut off, disabling the vehicle operating circuit and
walk away braking, allowing the vehicle to be towed.
• Motor Protection Circuit: The operator should never attempt to hold the vehicle on an incline by pressing the
accelerator pedal instead of the brake pedal, as motor overheating could result. By reducing the current to the
motor during such an occurrence, the motor protection circuit reduces the possibility of motor damage. When this
situation arises, a
motor stall fault is recorded by the speed controller and will be displayed on an IQDM handset in
the Diagnostic History menu. See Motor Stall on page 11-14.
• High Pedal Detect: This function prevents unexpected vehicle movement if the key switch is turned ON after the
accelerator is pressed. The vehicle will not move until the accelerator is released and pressed again. When this
situation arises, a
HPD fault is recorded by the speed controller and will be displayed on an IQDM handset in the
Diagnostic History menu. See HPD on page 11-13.
• Onboard Computer (OBC): The OBC, 1) monitors battery condition, 2) monitors the number of amp hours used
by the vehicle, 3) determines the number of amp hours required to recharge the batteries and shuts the charger
off when this number is reached, 4) determines when to activate regenerative motor braking, 5) locks out vehicle
movement while the charger is plugged into the vehicle charger receptacle, 6) stores operating data, which can be
read by the Communication Display Module (CDM).
See Communication Display Module (CDM) on page 13-38.
Page 13-2 2014 Precedent ® Golf Car Maintenance and Service Manual