Drive A1 Submenu
56
RAMPED STOP TIME
i,ii
(Ramped Stop Time)
This parameter is only used by the torque
ramp down stop function and sets the time to
ramp torque from rated torque to zero.
After the elevator lands and the brake is
applied, the torque ramp down function allows
the torque to ramp down at an even level. This
helps eliminate the ‘bump’ felt upon landing
caused by the torque being immediately
dropped to zero.
A function unique to elevators involves the
interaction between the motor torque and the
mechanical brake that holds the elevator.
Under full load conditions at the end of a run, if
the brake is set and the motor torque is
removed quickly, some brake slippage may
occur. Therefore, the option of gradually
reducing the motor torque is provided by the
Torque Ramp Down Stop function.
Upon being enabled by the Ramped Stop
Select Parameter (RAMPED STOP SEL(C1)),
the torque command is linearly ramped to zero
from the value that was present when the
‘Ramp Down Enable’ was selected.
The Ramp Down Enable has the following
three possible sources:
An input logic bit (EXTERNAL TB1)
The run command removal
The serial channel
The Ramp Down Enable Source parameter
(RAMP DOWN EN SRC(C1)) is used to select
one of the above options.
A method of providing the Ramp Down Enable
would be with a logic signal (EXTERNAL TB1)
that is dedicated to that function. The Ramp
Down Enable would be asserted while the Run
command is still present and remain there until
the ramp is completed, after which the Run
command would be removed.
The RUN LOGIC option to trigger the Ramp
Down Enable from the Run command is
provided. In this case, removal of the Run
command enables the Ramp Down Stop
Function.
The time it takes for the HPV 900 Series 2 to
perform its ramped stop is determined by the
Ramped Stop Time Parameter. The Ramped
Stop Time parameter (RAMPED STOP
TIME(A1)) selects the amount of time it would
take for the drive to ramp from the rated torque
to zero torque.
i
Parameter accessible through
CLOSED LOOP (U9)
ii
Parameter accessibly through
PM (U9)
SPEED DEVIATION
(Speed Deviation)
The following two functions are available to
indicate how the speed feedback is tracking
the speed reference.
Speed Deviation Low
i,
ii
– indicates that the
speed feedback is tracking the speed
reference within a defined range.
Speed Deviation High
i
– indicates that the
speed feedback is failing to properly track
the speed reference.
Speed Deviation Alm Level
ii
- the point at
which a Speed Deviation Alarm will be
declared by the software.
SPD DEV FLT LVL
ii
- the point at which a
Speed Deviation Fault will be declared
The Speed Deviation Low function has the
ability to set a configurable logic output
(C3
Submenu).
The logic output will be true, when
the speed feedback is tracking the speed
reference within a defined range around the
speed reference for a defined period of
time,see
The defined range is
determined by the Speed Deviation Low Level
parameter (SPD DEV LO LEVEL(A1)) and the
defined time is determined by the Speed
Deviation Time parameter (SPD DEV
TIME(A1)).
The Speed Deviation High function
annunciates a Speed Deviation Alarm
and has
the ability to set a configurable logic output
,
see Logic Outputs C3 on page 103.
The alarm
will be annunciated and the logic output will be
true, when the speed feedback is not properly
tracking the speed reference and is outside a
defined range around the speed reference.
The defined range is determined by the Speed
Deviation High Level parameter (SPD DEV HI
LEVEL(A1)).
iii
Parameter accessible through
OPEN LOOP(U9)