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Quattro DC Drive Parameters A1
Detailed descriptions
GAIN CHNG LEVEL
(Gain Change Level )
Works in conjunction with HI/LO GAIN SRC in
menu C0. When the gain control source is set
to internal, this parameter sets the speed
reference level that controls the Hi/Lo gain
switch. The velocity regulator will use normal
‘high gain’ when the reference speed is below
this value, or ‘low gain’ settings when the
speed reference is above this value.
On some elevators when the speed response
(gain) is set to high levels as required for good
velocity tracking during acceleration, the
resonant characteristics of the elevator ropes
can cause car vibration while running at steady
state speed. To reduce this problem, the
response (gain) of the speed regulator is
effectively reduced to a lower value so that the
resonant characteristics of the ropes are not
continuously excited. The High/Low gain
switch modifies the sensitivity or response of
the speed regulator via the gain reduce
multiplier.
The Gain Reduce Multiplier adjusts how much
gain reduction will occur at higher speeds.
The Gain Change Level (or external
command) determines when the gain change
will occur.
High / low gain switching may be controlled
either externally or internally. The high / low
gain source parameter (HI/LO GAIN SRC) in
Configuration menu C0 allows for an external
or automatic internal gain switch selection.
The high/low gain switch may be controlled by
either:
0%
contract
speed
low gain
mode
Response of
Speed Regulator
8.0 rad/sec
10%
contract
speed
10%
contract
speed
Response of
Speed Regulator
8.0 rad/sec
HPV 900 Parameter Settings
HI/LO GAIN SRC = internal
GAIN REDUCE MULT = 80%
GAIN CHNG LEVEL = 10 %
RESPONSE = 10.0 rad/sec
Response of
Speed Regulator
10.0 rad/sec
0%
contract
speed
Response of
Speed Regulator
10.0 rad/sec
speed reference
100%
contract
speed
• a logic input
• the serial channel
• the gain change level parameter (GAIN CHNG
LEVEL), which defines a percentage of
contract speed
High / Low Gain Example
36