Intelligent Cube Hopper MKII
Rev 2.0
Page 12
4.7. Logic mode anti-jam operation
If the hopper for some reason blocks (jams) the motor current will rise fast. When the current exceeds
a certain trip level (around 1.6 Amp), the motor will be reversed for T_clear ms. This is done to
withdraw any coins from the coin exit port that may have caused the block.
After the first reverse period the hopper is started again. If the hopper still blocks the motor will be
reversed for T_jamrev ms, and started again. This procedure is repeated until the hopper starts
ejecting coins again. If the jam is not cleared, the motor will stop due to its thermal fuse protection.
Any coin-sensor level changes during the anti-jamming procedure are discarded.
See timing figure below.
Clear coin exit port
Try to payout again
Anti-Jam
Forward
Motor Stopped
Reverse
Coin-Sensor (NC)
Coin Exit (pin 6)
T_clear
T_jamrev
coin enters exit port
coin withdrawn fromexit
port
Jam occurs here
Discard false pulse
Hopper still jammed
Figure 5: Anti-Jam timing in logic mode
