Magnetek HPV 900 Series 2, Техническое руководство

Страница: 204 / 230

APPENDIX
– Open-Loop Performance
182
Rollback or Bump at Start
If rollback is observed or a bump is felt at the
start, then until resolved, try the following (in
order):
1. Verify Mechanical Brake Timing
2. Increase DC Injection Start 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
picked during the DC injection start
time (DC START TIME (A1)
parameter), see “Mechanical Brake
Timing at Start” .
Increase DC Injection Start Level

Increase the DC START LEVEL (A1)
parameter by increments of 5% and
observe performance.
Decreasing Take-off Time
The following can help to decrease take-off
time, try the following (in order):
1. Increase DC Injection Start Level
2. Increase the Accel S-curve parameters
3. Increase the Torque Boost Gain
parameter
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.
Increase DC Injection Start Level

Increase the DC START LEVEL (A1)
parameter by increments of 5% and
observe performance.
Increase the Accel S-curve parameters

Increase take-off jerk rate via ACCEL
JERK IN x (A2) parameter

Increase acceleration rate via ACCEL
x (A2) parameter
Note: When increasing both jerk and accel
rates, watch for Overcurrent Faults or
decreased ride quality. If these occur, set
the rates back to the original values.
Increase the Torque Boost Gain Parameter

The Torque Boost function is defaulted
off (TORQ BOOST GAIN (A1)= 0).

Increase the TORQ BOOST GAIN
(A1) in 0.1 intervals and observe take-
off time and performance.
Note: When increasing the torque boost,
watch for Overcurrent Faults or decreased
ride quality. If these occur, set the gain
back.
Overcurrent Fault
If an “OVERCURR FLT” occurs it can indicate
the s-curve settings are too high (jerk, accel,
decel rates) or too much motor voltage is
generated. Until resolved, try the following (in
order):
1. Verify Mechanical Brake Timing
2. Verify Torque Limits
3. Decrease the S-curve parameters
4. Verify Motor Min/Mid Voltage
parameters
5. Increase DC Injection Start Level
6.
Measure the Motor’s Stator
Resistance
7. Decrease the Torque Boost
Note: if no 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 lifted
before the drive is given a non-zero
speed command

The mechanical brake should be
picked during the DC injection start
time (DC START TIME (A1)
parameter), see “Mechanical Brake
Timing at Start” .
Verify Torque Limits

The Torque Limits are defaulted at
200% (MTR TORQUE LIMIT(A1) and
REGEN TORQ LIMIT(A1)= 200%).

Decrease MTR TORQUE LIMIT (A1)
and REGEN TORQ LIMIT (A1)
parameters until default (200%).
Note: may need to set torque limits
below 200% if
motor’s current rating is
larger than the drive’s current rating
Decrease the S-curve Parameters

Decrease jerk rates via
-
ACCEL JERK IN x (A2),
- ACCEL JERK OUT x (A2)
- DECEL JERK IN x (A2)
- DECEL JERK OUT x (A2)

Decrease accel/decel rates via
-
ACCEL x (A2),
- DECEL x (A2)
Verify Motor Min/Mid Voltage Parameters

MOTOR MID VOLTS (A5) and
MOTOR MIN VOLTS (A5) parameters
should usually be set at default, see .

These parameters would only be
adjusted slightly with certain issues