Closed-loop User Switches C1
108
Because of this overshoot, the PI regulator is not
recommended for elevator control
PI Speed Regulator Example
The PI Speed Regulator is tuned by:
•
System Inertia parameter (INERTIA(A1)),
which is easy to obtain by using the drive
software to estimate the system inertia.
•
Response parameter (RESPONSE(A1)),
which is the overall regulator bandwidth in
radians per sec. This parameter defines the
responsiveness of the speed regulator.
•
Speed Phase Margin parameter (SPD
PHASE MARGIN(A1)) is used only by the PI
Speed Regulator to define the phase margin
of the speed regulator,.
MOTOR ROTATION
(Motor Rotation)
This parameter allows the user to change the
direction of the motor rotation. As an example, if
the car controller is commanding the up direction
and the car is actually going in a down direction,
this parameter can be changed to allow the
motor rotation to match the car controller
command.
SPD REF RELEASE
(Speed Reference Release)
The user can select when the Speed Reference
Release signal is asserted:
•
If the user does not want the drive to wait for
the mechanical brake to be picked then SPD
REF RELEASE can be made equal to REG
RELEASE;
•
If the user does want the drive to wait for the
brake to be picked then SPD REF
RELEASE is not asserted until BRAKE
PICKED becomes true.
CONT CONFIRM SRC
(Contactor Confirm Source)
This switch selects if hardware confirmation of
motor contactor closure is necessary before
drive attempts to pass current through motor. If
hardware confirmation is available set to
EXTERNAL TB1 and select the Contact Cnfirm
signal on a logic input terminal.
PreTorque SOURCE
(Pre-Torque Source)
This switch determines if a pre torque command
is used and if used the source.
Pre-torque is the value of torque that the drive
should produce as soon as the speed regulator
is released to prevent rollback due to
unbalanced elevator loads.
This ‘priming’ of the speed regulator is done with
the pre-torque command, which is used when
the speed regulator release is asserted.
The two possible sources for the pre-torque
command are following:
•
serial channel
•
analog channel
The serial channel is a RS-422 or 485 serial port
on option card. The analog pre-torque signal is
bipolar (±10V). Available with the analog
channel is a Pre-Torque Command Multiplier
(PRE TORQUE MULT (A1)) and Pre-Torque
Bias (PRE TORQUE BIAS(A1)). These
parameters are used to scale the user’s analog
pre-torque command to the proper range for use
by the drive software.
Pre-Torque LATCH
This parameter determines if the pre-torque
signal is latched.
NOTE: If PreTorque Source has been set to
NONE, the setting does not have any effect on
the operation of the drive.
Some car controllers send both analog pre-
torque and speed commands . To facilitate this,
the HPV 600 has the option of latching the pre-
torque command.
If pre-torque latching is selected using the Pre-
Torque Latch parameter, a FALSE to TRUE
transition on the pre-torque latch clock latches
the value on the pre-torque channel into the
drive. This channel is allowed to change any
time except during this transition without
affecting the value of the latched pre-torque
command.
speed
feedback
zero tracking delay
speed
reference
commanded
speed
overshoot
time
speed