166
E300 Installation and Commissioning Guide
Issue Number: 1
8 Optimization
8.1 Optimization
The
E300 Advanced Elevator
drive
has variable speed and current control loop gains available for the start, travel and stop functions. By default the
drive is set-up to use 2 sets of control loop gains for start, travel and stop.
Open loop operation has variable current control loop gains with no speed control loop gains.
By default, the start lock position control loop gain is disabled. Prior to setting up the start lock position gain, the speed and current control loop gains
should be optimized. During start and following brake release, if there is any roll back movement of the sheave, the start lock position control loop
gain can be enabled.
By default start optimization is disabled. In most cases correct adjustment of the speed and current control loop gains will provide good performance.
The start optimization feature can be enabled should mechanical imperfections exist.
8.2 Control loop gain adjustment
8.2.1 Current control loop
The drive must be optimized by a responsible person who is familiar with the systems operation and safety requirements to avoid a safety
hazard. Correct adjustment should be carried out as detailed in the Installation and Commissioning guide to avoid the risk of product
damage a safety hazard.
Current control loop gains
P Gain parameters I03 (Start), I08 (Run), I13 (Stop)
I Gain parameters I04 (Start), I09 (Run), I14 (Stop)
Current control loop filter
Current loop filter, parameters I05 (Start), I10 (Run), I15 (Stop)
The current control loop gains proportional (P) and integral (I) control the response of the current loop to a change in current (torque) demand during
start stop (brake control) and operation. The default values give satisfactory operation with most motors, however for best performance an autotune
should be carried out to achieve optimum values, this being either a static or rotating autotune.
The proportional current control loop gain parameter
I03
(Start),
I08
(Run) are the most critical in controlling the performance.
Manual adjustment of the current control loop gains are not recommended from the autotune values;
•
During a static or rotating autotune the drive measures both the resistance and inductance of the motor and sets up
Stator Resistance
(
B35
) and
Transient Inductance
(
B34
) from these values the current loop gains are calculated.
•
Once the autotune has been completed and the current loop gains set-up these can be manually adjusted if required where for example motor
acoustic noise may be an issue.
The current loop filter defines the time constant of a first order filter that can be applied to the final current reference. The filter is provided to reduce
acoustic noise and vibration produced as a result of position feedback quantisation. The filter introduces a lag in the speed control loop, and so the
speed controller gains may need to be reduced to maintain stability as the filter time constant is increased. The current control loop filter is not
available in Open loop mode.
NOTE
NOTE
NOTE
NOTE
CAUTION
Summary of Contents for E300 Series
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