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Open-loop Start-up
16
Overshooting Floor
only with Regen Load
If the car overshoots the floor only with a regen
load (i.e. empty-up) then:
•
Verify the car DOES NOT overshoot
with balanced car and empty-down…if it
does refer to Overshooting Floor section
on page 15.
•
If only overshoots empty-up, increase
MOTOR MIN VOLTS (A5) in increments
of 0.1 V and observe performance.
Note: if no performance change is observed,
set the Motor Min Volts parameter to the
original value.
Rollback at Stop
If rollback is observed at the stop, then until
resolved, try the following (in order):
1. Verify Mechanical Brake Timing
2. Decrease Decel Jerk Out Rate
3. Increase DC Injection Stop Level
Note: if no performance change is observed
after any one step, set any changed value(s)
back to the original value(s) before
proceeding onto the next step.
Verify Mechanical Brake Timing
The mechanical brake should be dropped
during the DC injection stop time (DC STOP
TIME (A1) parameter) , see “Mechanical
Brake Timing at Stop” on page 17.
Decrease Decel Jerk Out Rate
•
Decrease jerk rate via DECEL JERK
OUT x (A2) parameter and observe
performance.
Increase DC Injection Stop Level
•
Increase the DC STOP LEVEL (A1)
parameter in increments of 5% and
observe performance.
Measuring Stator Resistance Procedure
The stator resistance value can be measured by:
!
Remove any two motor wires directly
at the terminals of the motor. Since
the stator resistance is low, the
resistance needs to be measured at
the motor terminals in order to avoid
the resistance of the motor wires
!
Connect the two meter leads together
and measure the resistance of the
meter leads in ohms (
meter
resistance
). Since the stator
resistance is low, the resistance of the
meter leads need to be taken into
account.
!
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