Service Manual
Hako GmbH
Technical Service (KUD) 23843 Bad Oldesloe
Edition: 05/2014
Confidential - For internal use only!
6.4.2 Logic
Starting/Driving Safety Function
After ignition ON, 12V apply to PIN1 while simultaneously ground applies to PIN4 (seat contact closed) and the PIN8 output is
connected. Voltage then applies to relay K2 (motor release). If, at the same time, 12V apply to PIN7 (accelerator pedal in neutral
position), the PIN5 output will be connected. This allows supplying the relay K3 (starter) with current. If the seat contact is interrupted
for 3 seconds or more (voltage at PIN4 to 12V), PIN8 output releases. This interrupts voltage supply to the release relay Riding (K2). If
no voltage applies to the PIN4 input for 2 seconds or more, the PIN5 output will be switched off. This causes the starter relay (K2) to
switch off.
Output Monitoring Safety Function
If voltage supply either at the PIN3 logic or at PIN2 supply breaks down, both outputs PIN 5+8 are switched off. The controller
proceeds to a self-test directly after switching on (ignition ON) by first switching briefly on and off the PIN5 output and reading back via
PIN9 input, followed by the PIN8 output. Should feedback to PIN9 be incorrect (internal error, external error: short-circuit behind plus),
both outputs switch off.
Input Monitoring Safety Function
The PIN7 (neutral switch) and PIN4 (seat contact switch) inputs are permanently monitored. Should they be connected for 6 hours or
longer (PIN4 ground; PIN7 12V) with simultaneous connection of PIN8 output, the next start trial will be inhibited. Actuation of the seat
contact switch is required before resetting is available (even if neutral switch was the cause).
