Suzohapp Evolution EV01000, Product Manual

Technical Manual Evolution Hopper Standard Interface Model (EV01000)

Page 12 of 22

22-10-07

At power up in mode 2, IN3 is high. The first falling edge will be recognised as the first pulse
and the hopper motor will start running.
Pulsing on IN3 should not commence earlier than 130ms after the logic supply has been
established. This will allow for the power up timeout of 100ms and further processing time
prior to running the main program.

6.2.4 RESET FUNCTION

In this mode the Hopper is reset, i.e. processor reset and motor drive disabled. This function is
provided as added security enabling the host machine to immediately stop the Hopper irrespective of
its mode of operation.
Whilst in this mode connecting IN3 (pin 12) to ground turns the exit window sensor off in
order to test it is operative. Confirmation would be given as a signal output on pin 3 and 11 of
the 12 pin connector.

6.3 Optical Sensors

Optical sensors are fitted on the optic board in the exit window to detect coin pay-out.
A debounced coin output is available on pin 3 and pin 11. When no coins are present at the exit
window, the optical sensors are clear, the output transistors are open circuit, and the LED indicator is
off. Coins passing the optical sensors obstruct the light path causing the output transistors to pull down
to OV and the GREEN LED SENSOR indicator switches on.

6.4 Optical Security Feature

The output of the optical sensor is monitored by the microprocessor and if the sensor remains
obstructed for more than one second, the motor will be braked and will remain off until either the
sensor is cleared or power down takes place. This action will result if a coin jams in the exit
window or if the optical sensor fails which could be checked by toggling IN3 in Reset Mode.
If the security feature is operational, the security output on output pin 5 and the LED SECURITY
indicator will be switched off.
The optical security feature operates identically in all 3 Modes.

6.5 Motor Operation

The DC motor is controlled by the processor via a transistor bridge. The motor will run provided
that one of the sets of conditions shown below is met. If any single condition fails then the motor
is braked and remains so until all conditions bee true, or a power down occurs.

Mode 0 Motor Start Conditions:
- Security feature true
- 24V line true.

Mode 1 Motor Start Conditions:
- Security feature true
- 24V line true
- IN3 input low.

Mode 2 Motor Start Conditions:
- Security line true
- 24V line true
- internal coin count nonzero.

When braking is initiated for whatever reason, 50ms braking is carried out even if the fault
condition recovers before that time. This guarantees that the motor is stationary when the
bridge drivers change state, so that no excess current flows in the motor windings.

6.6 Motor Current Limit

The motor current is monitored by the processor. When the motor initially starts, the current is build up
gradually using PWM-current control. This reduces the high initial surge currents that occur in non-
current controlled motor driver circuits.