GAELCO Tuning Race, User Manual, Page: 38 / 73

GAELCO - TUNING RACE
38
The motion system includes an emergency stop which is operated by a red knob on top of
the coin tower. The emergency circuit-breaker is connected in series so that it will bring the
car to a standstill (see the block diagram of section 9.3). Should the movement system not
work, the cause may lie in: either of the stop switch; in the cables; or on the CPU board.
Actually, the emergency stop button activates two circuits: one runs through the CPU and
only serves to give a screen warning that the button has been pressed. The other circuit is
the real emergency stop, which does not run through the CPU but acts directly on the
frequency converters governing the AC motors.
The following steps must be taken before finding the fault:
1. Open the front door of the monitor cabinet.
2. Remove the Faraday cage which covers the motor drivers (see the exploding 10.8).
This reveals the LED displays which provide information on the state of each driver.
3. To check the emergency stop circuit, go to the MOTION SYSTEM screen in Test Mode
and select the line "Security". If the red knob is in the rest position (circuit closed,
movement possible), the message will read OFF. When the red knob is pressed, the
message will change to ON (circuit open, motors stopped). When the knob is turned
clockwise, the movement system is ready to operate. The message turns back to OFF
(movement system ready).
9.4 EMERGENCY STOP
However: the previous check only covers the signal processed by the CPU but the problem
could lie in the actual security circuit which goes directly to the drivers. It should be noted
that the CPU does not detect whether the security circuit is operative but only that the
emergency stop button is being pressed. To check whether this is the case, select the
Motion Test from the MOTION SYSTEM screen while in Test Mode. Refer to the circuit
diagram in following the steps below:
Under normal conditions, when the button is in the rest position (i.e. not pressed), the
message " rd " will appear in the left-hand window of both drivers. However, if the message
is " ih ", this indicates that the circuit remains open for some reason (e.g. bad connection,
damaged cable, faulty button, etc.). The stop message will appear on the monitor screen,
consisting of an image of the stop knob and an acoustic warning.
The most likely fault would be a short-circuit if the message of the drivers is neither " rd "
nor " ih " and there is no stop message on the monitor.