Initial System Startup
29
Escalator Braking Distance Feature This feature (not available in all versions of
software) measures the stopping distance of the escalator by monitoring the output of the hand-
rail proximity sensors at S4 and S5 of the MCB. Immediately upon receiving a stop signal, the
MCB counts the number of pulses received at S4 and S5 and determines whether or not the
escalator has stopped within a user-defined tolerance.
• If the number of pulses matches the learned value within the programmable stopping dis-
tance error, then no error is generated.
• If the number of pulses exceeds the learned value by more than the programmable stop-
ping distance error, then E57 “Stop is too long” is generated.
• If the number of pulses is less than the learned value by more than the programmable
stopping distance error, then E58 “Stop is too short” is generated.
Associated Parameters
• F3-19 Self-learned Stopping Distance: (0-9999; 0 means feature is disabled)
• F3-20 Stopping Distance Error: (0-99%; default = 50)
1. Be sure that the brake is adjusted correctly so that the escalator is stopping within the
desired distance.
2. Enter 1 for parameter F3-19. This enables the feature and allows the MCB to establish a
baseline stopping distance the next time a learn function is performed.
3. Perform a learn function. Please refer to “Escalator Learn Operation” on page 30. In
order for the stopping distance to be learned, the escalator must be stopped during the
learn function. After completing the learn function by stopping the escalator, note that
the value of F3-19 has been updated to reflect the baseline stopping distance for the
escalator.
To reliably calculate the braking distance, the learned value of F3-19 must be at least 6. If the
learned value is less than 6, the handrail wheels will need to be modified such that pulses are
generated at a higher frequency. This can be achieved by either making the diameter of the
wheels smaller or by adding more surfaces to the wheels that trigger the sensor. If more sur-
faces that trigger the sensors are added, all of the surfaces must be equidistant from each other.
Adjust F3-20 to define the stopping distance error. For example, assume F3-19 is determined to
be 10 after performing the learn function. If F3-20 is set to 30, this means that the allowable
stopping distance is between 7 and 13 counts (10 +/- 30%). If the escalator stops outside of this
range, an error message will be generated.
To Next Page
Loading...