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APPENDIX
– Open-Loop Performance
186
Measure the resistance between the
two motor terminals in ohms (
stator
resistance
)
With the motor nameplate values
entered in the A5 menu, use the BASE
IMPEDANCE (D2) value (in ohms) to
calculate the STATOR RESIST (A5)
parameter (as a percentage of base
impedance):
100
(D2)
IMPEDANCE
BASE
x
2
resistance
meter
-
resistance
stator
Mid-volts Adjustment Procedure
Run the drive (Balanced) at 10% of
contract speed
Verify the running currents are
approximately equal in both directions.
The middle voltage level (via MOTOR
MID VOLTS (A5) parameter) should be
adjusted in 1 or 2 volt increments and the
current monitored in both the up and
down directions until the running currents
are approximately equal.
Note: If the middle voltage is set too high,
the drive will begin to trip on over current
faults during normal operation or effect
stopping performance (i.e. coming into
the floor too fast)
Note: If after raising the midpoint voltage
spotting again begins to occur, set mid
voltage back to previous value
Mechanical Brake Timing at Start
The mechanical brake should be picked
during the DC injection start time (DC
START TIME (A1) parameter).
But allow 0.5 seconds for the motor to
build up flux before lifting the
mechanical brake.
Also, do not have the DC injection last
more than 0.5 seconds after the
mechanical brake is lifted.
If drive controls the mechanical brake,
the DC inject start time should be at
least 0.5 seconds greater than the
brake pick delay (BRAKE PICK DELAY
(A1)).
AUTO STOP EN (C1) parameter
-
Enabled - The drive will start DC
injection phase when it receives a
run command and a non-zero
speed command.
-
Disabled - The drive will start DC
injection phase when it receives a
run command.
Mechanical Brake Timing at Stop
The mechanical brake should be dropped
during the DC injection stop time (DC
STOP TIME (A1) parameter).
But allow additional stopping dc
injection time after the mechanical
brake is dropped for it to close.
If drive controls the mechanical brake
via BRAKE PICK logic output, the DC
inject stop time should be greater than
the brake pick delay (BRAKE PICK
DELAY (A1)) by the time it takes for the
mechanical brake to close.
AUTO STOP ENA (C1)=DISABLED
STOPPING MODE SEL (C1) =
-
RAMP
- Run command removed - the
drive will ramp to DC injection
phase.
- Commanding zero speed - the
drive will try to hold zero speed
(not DC injection).
-
IMMEDIATE
- Run command removed - the
drive will immediate turn off its
outputs (coast to stop).
- Commanding zero speed - the
drive will ramp to DC injection
phase.
AUTO STOP ENA (C1) =ENABLED
STOPPING MODE SEL (C1) =
-
RAMP
- Run command removed - the
drive will ramp to DC injection
phase.
- Commanding zero speed - the
drive will ramp to DC injection
phase.
-
IMMEDIATE
- Run command removed - the
drive will immediately turn off its
outputs (coast to stop).
- Commanding zero speed - the
drive will immediately turn off its
outputs (coast to stop).
Содержание HPV 900 Series 2
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