Hisun HS 500 Owner's Manual page 77

Drive UTV with faulty EPS system may cause
accident, severe injury or even death.
Never operate UTV with faulty EPS system.
■ Function of EPS system

EPS system requires enough power to supply
correct power torque.

Supply steering power according to speed
UTV's steering power can change as different
various speeds and steering angle.
EPS systems can supply different power torque
depending on the speed and steering angle.
① T1 ： steering resistant torque which is checked by
steering power sensor
② T2：power torque on steering gear which is supplied by
EPS system
③ Power Torque In Static Condition
④ Power Torque At Middle Speed
⑤ Power Torque At The Highest Speed
Stationary, the maximum power torque can make
UTV U-turn or stop into place as much as possible
to ease the steering operation.
With increased speed, reduce power torque can
make UTV at high speed, to make ii easier to
maintain driving direction.
As shown, power auxiliary effect depends not only
on speed, but also steering torque exerted by the
driver. If the driver is to impose a smaller steering
ELECTRIC POWER STEERING SYSTEM
torque, power torque of the EPS system will be
relatively small. This can be achieved outstanding
auto-centering effect, that means when UTV is in
straight-line, steering system will be not sensitive
(the steering wheel does not move from side to
side).

Fault alarm and protection function
In order to ensure EPS system can supply a
long-term, reliable working, a variety of detection
and alarm functions are set in the ECU software
program. Once fault has been checked on EPS
system, UTV can accurate shutdown the EPS
system.
Shut off the EPS system, UTV will be able to
continue to complete the steering function through
the mechanical structure of the steering system.
However, at this time the driver will feel the turning
resistance increases, you can continue your
driving of UTV only throw a greater force to operate
the steering system.
DANGER
When meter indicated malfunction of EPS system
or when the driver found EPS system operation
abnormally, please do some steps as below：

Stop vehicles immediately, close the main
switch, open the front panel's repair cover, and
pull up the outlet which power supply for EPS
system (See page12-3)

Driving UTV to dealer by lower velocity and
repair EPS system.
EPS SYSTEM'S INSPECTION,
MAINTENANCE, REPAIR：
EPS system had already inspected by strict quality
restriction before delivery, so it has high reliability.
15-6