Carotron Elite Pro EPN020-000 Instruction Manual Download

Page: 18 / 110

particular diameter actually started earlier in the roll. Set

Taper Diameter (456)

to the

diameter level at which tapering is required. Start a new roll of material and wind until
tapering is required. As material is wound further, adjust

Taper Percentage (457)

control the level of taper.

6.5.11 In most applications, the diameter memory function is not needed and

Diameter

Memory Reset (447)

can remain set to True. However, in cases where restarting

partially completed rolls is a problem, a digital input should be configured to control
the Diameter Memory Reset parameter. This will allow the memory function to be
active as rolls are built.

WARNING! THIS REQUIRES RESETTING THE DIAMETER

MEMORY BEFORE RESTARTING A NEW ROLL!

6.5.12 If parameters were not saved when exiting the programming section, navigate to

QP15 screen and select P2 to Save.

6.6 Calibration & Fine Tuning

If using AFB, the

IR Compensation (131)

parameter can be adjusted to improve the

speed regulation with load changes. Adjustment is best done when the motor or machine
can be loaded normally. If the motor is normally operated at a particular speed, adjust

Compensation

while running at that speed. If the motor operates under load over a wide

speed range, pick a speed near mid-range to make the adjustment. Adjust as follows:

Operate the unloaded motor at the normal or mid-range speed and note the exact
speed. While still monitoring speed, apply normal load. The reduction in speed of a
fully loaded motor will usually fall between 2 and 13% of rated or "Base" speed. Slowly
increase the

IR Compensation (131)

parameter until the loaded speed equals the

unloaded speed measured in the previous step. Making this adjustment may now
cause the unloaded speed to be slightly higher. Repeat this procedure until there is no
difference between loaded and unloaded speed levels. Use care not to set the
adjustment too high or speed increase with load and instability may result. NOTE: For
this adjustment, do not use AFB to measure speed. Armature voltage is not an exact
indication of loaded motor speed!

2. The

Current Proportional Gain (107)

Current Integral Time (108)

Velocity

Proportional Gain (201)

, and

Velocity Integral Time (202)

parameters are preset by

Carotron to provide stable and responsive performance under most load conditions.
When required, the drive performance can be optimized for a particular application or to
correct undesirable operation by use of these adjustments. The adjustments are complex
though and can adversely affect operation if not properly set. In general, the settings that
give the most stable operation do not always give the fastest response.

Current Loop

The current loop can be manually tuned by directly applying a stepped reference and
monitoring the current feedback. In order to adjust properly, connect an oscilloscope
between common and the Armature IFB testpoint on CN11. Using the HMI, temporarily
set

Ramp Bypass (305)

to True. The rotor shaft must not rotate during this procedure.

Therefore, set

Field Enable (331)

to False to remove voltage from the shunt field. Set the

drive to torque mode by setting

Drive Mode (109,110)

to Torque. Run the drive and apply

a step change to the external reference and monitor the current feedback. The signal
should respond quickly with minimum overshoot. Adjust the

Current Proportional Gain

(107)

and

Current Integral Time (108)

parameters to obtain a critically damped

waveform as seen in Figure 5. Increasing the proportional gain improves the response but
increases the overshoot. Reducing the integral time improves the response but can cause
instability if set too low. Return

Ramp Bypass

Field Enable

, &

Drive Mode

to their

previous settings when complete.