Safety
information
Product
information
Mechanical
installation
Electrical
installation
Getting
started
User Menu A Commissioning
Advanced
Parameters
Diagnostics
Optimization CT MODBUS RTU Technical Data
Installation and System Design Guide 297
Issue Number: 1
10.4 Creep to floor - Start optimization
The start ride comfort of the Elevator can be optimized through either the profile settings or by adjustment of the drives control loop gains. The start
profile should firstly be set-up, optimized (Run jerk 1, and Acceleration rate) prior to adjustment of the drives control loop gains which include the Start
lock position gain plus speed and current control loop gains.
10.4.1 Profile settings
Optimization of the start profile is carried out adjusting the start S ramp (Run jerk 1) and the acceleration rate.
Table 10-2 Start profile optimization parameters
10.4.2 Control loop gains
During the start there is a start lock position control loop gain active during the brake control for optimization. Also during start there are both start
speed and current control loop gains and a start current loop filter. The position feedback filter available is active during the complete travel and if
required this should be adjusted to suit the start, travel and stop.
Table 10-3 Start control loop gains
10.4.3 Start locking position controller (RFC-A and RFC-S)
Start Locking Position Loop
The Start locking position controller applies compensation during starting preventing movement during start brake release, preventing roll back and
jerk.
In order to get the best performance from the Start locking position control, and lift control a high resolution position feedback device is recommended
(for example SC.EnDat, SC.Hiperface, SC.SC).
The start locking position controller settings are basic values and will require some adjustment to reach the optimal value which is also dependent
upon the Start speed loop gains, position feedback device and installation.
In order to get the best performance during starting without roll-back, and also preventing brake noise I23 Start Lock Position Change Max can be
setup and adjusted for example from 0.25…0.50 %.
Parameter Setting
Run Jerk 1 (G13)
The start S ramp can be increased if the Elevator starts with a jerk resulting in a slower more controlled start. If the
Elevator starts slowly and swings the start S ramp should be decreased resulting in an increased acceleration at
start.
Recommended = application specific
Acceleration Rate (G11)
The acceleration rate is set-up for the profile to reach a given acceleration for the rated speed with good ride
quality. This can be optimized to achieve higher levels of ride quality.
Recommended = application specific
Parameter Setting
Motor Torque Ramp Time (D02)
Time to ramp torque up on the motor against the mechanical brake, increase to overcome any acoustic
noise.
Start Lock P Gain Speed Clamp (I21)
The start lock position control loop P gain can be optimized if used following set-up of the speed and current
loop gains. Higher values of P gain will correct for any position error during brake release. Excessive values
will result in both instability while holding zero speed and acoustic noise.
Recommended = 10 to 100
Start Speed Loop P Gain (I01)
Start Speed Loop I Gain (I02)
Start speed loop gains are optimized to hold zero speed during brake release (I gain) and to provide smooth
control during the start P gain). Both gains can be limited where noise is present on the position feedback, in
this case the encoder feedback or current loop filter may be required.
Recommended P) = 800 to 2500
Recommended I) = 1000 to 3000
Start Current Loop P Gain (I03)
Start Current Loop I Gain (I04)
High values of current loop P gain (> 150 % of autotune value) can result in motor acoustic noise. Low
values of current control loop gains (< 50 % of autotune value) will result in oscillations and poor ride quality.
Recommended = Autotune values
Start Current Loop Filter (I05)
Used to over come motor acoustic noise and instability due to system induced noise as a result of un-
shielded cables or poor shield and ground terminations.
Recommended = 1.0 to 4.0 ms
Drive Encoder Feedback Filter (C09)
Used to over come motor acoustic noise and instability due to system induced noise as a result of un-
shielded cables or poor shield and ground terminations.
Recommended = 1 to 2 ms
Parameter Description Default setting
A55 / I22 Start Lock Enable Off (0)
A56 / I21 Start Lock P Gain Speed Clamp 40.000 mm/s
A57 / I20 Start Lock P Gain 20.000
I23 Start Lock Position Change Max 0.00 %
To Next Page
Loading...
