Final Adjustment
4-20 Manual # 42-02-7223
• Slope of Acceleration / Deceleration - Ideally, the slope of acceleration in volts per
second should be equal to or slightly greater than the slope of deceleration as viewed on an
oscilloscope connected to iBox test point STP1 and COM (Virtual Oscilloscope Test point 1
set to Speed Feedback Filtered). In a system where tracking accuracy is very good, Acceler-
ation can be equal to Deceleration. If tracking is less accurate, set Acceleration greater
than Deceleration to get the same effective rate of deceleration as acceleration.
• Final Approach to the Floor -
Final approach to the floor can be
customized in many ways. If track-
ing accuracy is very good, set as fol-
lows on the iView Pattern >
Common tab:
• Leveling speed = Your desired
leveling speed. A typical number
is from 2 to 4.
• Leveling distance = your choice. A typical setting is from 0.12 to 0.25.
If tracking is not perfect, you can begin to introduce values in Leveling speed and distance that
allow you to mold the shape of the last few inches of approach.
• Excessive Motor Noise - If there is excessive motor noise or if acceleration or decelera-
tion feels rough, reduce Acceleration and/or Deceleration to provide the desired results.
• Bunching up of Deceleration Rate - If you observe “bunching up” of deceleration
(decel rate increase in the last few feet of approach), it is generally due to poor tracking:
1. You must improve accuracy or lower the value of the Flare jerk and/or Approach jerk
parameters. Remember that there are very real limits to how low you can set these
parameters (1.75 ft/s
3
is often as low as you can go).
2. Verify Lag Delay is correct. Depending on drive tuning, lag between commanded speed
and drive response can vary. As the drive is adjusted, the Lag delay parameter on the
Controller > View > Configuration > Pattern > Common tab will need to change as well.
• If lag delay is insufficient, the elevator will plow into a landing. The acceleration and
jerk rate during deceleration to a landing will be greater than profile values indicate.
• If lag delay is excessive, the elevator will drag into a landing. Acceleration and jerk rate
during deceleration will be less than profile values indicate. In addition, a discontinu-
ity in the profile will occur during the transition from acceleration to deceleration for
movement between floors where a stabilized speed is not reached. Under normal oper-
ation, this would occur when contract speed is not achieved.
• To adjust Lag delay, observe “Acceleration (Raw)” on the virtual oscilloscope. Perform
one-floor-run movement and observe the transition through zero (peak acceleration
transitioning to peak deceleration as the elevator reaches its peak speed that is less
than contract speed). This transition should have no vertical (too much Lag delay) or
horizontal (too little Lag delay) discontinuity. This transition adjustment is only valid
when the elevator is unable to reach the maximum speed for a particular profile
(unable to reach contract speed under normal operation). A physical oscilloscope may
be required to see this transition properly. Adjust the Lag delay until the vertical dis-
continuity is eliminated.
• For initial setup, set the Lag delay parameter to 0.3 seconds on the Configuration >
Pattern > Common tab.
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