Dynamatic 15-539-14 Instructieblad - Pagina 11

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place it in the Increased position. Adjust current feedback R20 as required to obtain desired drive

response.

*See basic 4000/4050 manual for a more detailed description of this adjustment.

R18- The purpose of Linear Acceleration is to slow down drive response to an increase

Accel Rate

in command. Without Linear Accel control, the drive will respond to operator speed adjustments

very quickly, limited only by the torque capacity of the drive. With the Linear Accel circuit, the

output of the controller is linear with respect to time. This circuit is adjustable from 3 to 90

seconds. When set at the slowest acceleration rate, the drive will take 90 seconds to accelerate

from zero to rated speed, following a linear ramp. When less than rated speed is set, this time

required to reach top speed is proportionally less.

The Linear Acceleration circuit may be activated or deactivated by setting the programming

switches as indicated on the programming chart on the connection diagram. To set the Accel Rate:

stop the controller with the Stop pushbutton. Turn the Run Speed potentiometer to 100% (Full

CW). With the drive at a complete stop, push the Start pushbutton, and time the interval required

for the drive to accelerate from zero to full speed. Adjust the Accel Rate potentiometer R18 CCW

for a slower accel rate, or CW for a faster accel rate.

Note: Only the Acceleration Rate is adjustable. The response of the controller to a reduced command is

instantaneous. The response of the drive to a decrease in command is a function of drive system load and

inertia.

Velocity Damping

response (drive response is a function of the clutch coil time constant and system inertia) The

proper setting for this adjustment depends upon the drive size and total load inertia.

See Preliminary Adjustments. If instability (speed control becomes erratic) occurs at any setting

increase (turn CW) slightly until the speed becomes stable.

*See basic 4000/4050 manual for a more detailed description of this adjustment.

10.

R20- This pot is located on the Torque Limit modification board. It is used for

HI Damping

applications, such as stamping presses, where the load inertia is greater than 5 to 10 times the

drive inertia. In these cases, turn the Velocity Damping pot R22 on the main board to zero (Full

CCW). Now adjust the HI Damping pot R20 on the modification board until the proper response

is achieved (neither oscillatory not sluggish). If, however, maximum CW is attained and the system

remain oscillatory, further damping may be obtained from R22 on the main board. The main PCB

Velocity Damping pot R22 has about 75% of the damping range that the HI Damping pot R20 has

on the modification

11.

Torque Limit PCB 15-444-2 (Normal Load)

a. Apply a normal load on the mechanical unit driven by the clutch.

R22*- This potentiometer is used to match the controller response to the drive