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Closed-loop Drive A1
91
NOTCH FILTER FRQ
(Notch Filter Center Frequency)
This parameter determines the notch filter center
frequency.
Notch Filter
Although originally created for gearless
applications where elevator rope resonance is
sometimes an issue, this filter affects the torque
command output of the speed regulator and will
filter out specific frequencies. By filtering a
specific frequency, the speed regulator will avoid
exciting a mechanical resonance if one exists at
that frequency.
There is attenuation across a range of
frequencies, not just at the set frequency, but to
a lesser degree. The filter starts attenuation at
frequencies lower than the notch frequency set
point. When the notch frequency is set to low
values (less than 10 Hz), the filter can interfere
with the desired response of the drive. This can
be exhibited by minor increase in the rollback of
the drive at start and some deterioration in the
ability of the drive to track an s-curve reference.
Generally, this would not be an issue if the notch
frequency were set at or above 10 Hz.
Notch Filter Example
settings:
NOTCH FILTER FRQ (A1) = 20Hz
NOTCH FILT DEPTH (A1) = 50% and 100%
NOTCH FILT DEPTH
(Notch Filter Depth)
This parameter determines notch filter maximum
attenuation.
Note: A filter depth setting of zero (NOTCH
FILT DEPTH (A1) =0) removes the filter.
MSPD DELAY 1-4
(Multi-step Speed Delay)
These four parameters determine the
recognition time delay for a multi-step speed
commands defined by MLT-SPD TO DLY1-4
(C1) parameters.
When setting up an elevator, slow-down and
stop switches are set at fixed locations in the
shaft. Once the drive is tuned, it might require
the user to move the switches in the shaft in
order to minimize the time spent at leveling
speed.
Under "normal” operation, the drive speed
reference follows the speed command. By
configuring for “delayed” operation and setting
speed command 1 for a delay (MLT-SPD TO
DLY 1 = MSPD 1), the recognition of the speed
command change from speed command 1 to
any other speed command (in this case speed
command 2) will be delayed by the setting of
MSPD DELAY 1 (A1) parameter.
1
1
10
3
2
2
1
1
5
0
Frequency
(Hz)
Attenuation
(dB)
Speed Command 1
Zero speed commanded
(Stop switch activated)
Speed Command 2 commanded
(Slow down switch activated)
Speed Command 1
delay time = 0.3 sec
(MSPD DELAY 1 = 0.3 sec)
Travel time
saved
speed
command
speed
reference
(normal)
speed
reference
(delayed)
Speed Command 2