Rockwell Automation FlexPak Plus, MinPak Plus DC Drive Torque Taper User Manual

Torque Taper Kit

for Non-Regenerative FlexP ak Plus

and MinPak Plus DC Drives

Model Number 14C224

Instruction Manual D2-3386

ATTENTION: Only qualified electrical personnel familiar with the construction and operation of

this equipment and the hazards involved should install, adjust, operate, and/or service this

!

Product Description

The Torque Taper kit allows fine adjustment of the slope and breakpoint of the drive’s speed-torque curve. It
should be used where simple, center-driven winders and similar applications require a reciprocal speed-torque
relationship to maintain constant tension as material builds up. In these cases, a higher current limit (higher
torque) setting is required for a decrease in motor speed due to a growing diameter. See figure 1.

equipment. Read and understand this manual and other applicable manuals in their entirety
before proceeding. Failure to observe this precaution could result in severe bodily injury or loss
of life.

100%

base

speed

N

(rpm)

The Torque Taper kit comprises a module (printed circuit board) and a mounting screw. No other equipment is
required. However, the Speed potentiometer and either the Torque potentiometer or the Current Limit
potentiometer on the drive’s Regulator module are used in conjunction with the two potentiometers on the
Torque Taper module.

SPEED pot

0

I (torque)

Figure 1 – Torque Curves

CORE TORQUE pot

Torque

taper

100% current (torque)

Current

Limit pot

or

Torque pot

Reliance and MinPak are trademarks of Rockwell Automation.

© 1999 Rockwell International Corporation

Installing and Adjusting the Torque Taper Kit

ATTENTION: Do not install modification kits with power applied to the drive. Disconnect, lock

out, and tag all sources of incoming AC power to the drive before attempting such installation.

!

Refer to your drive instruction manual for help locating and identifying drive components.
To install the Torque Taper kit in your non-regenerative FlexPak Plus or MinPak Plus DC drive:
Step 1. Disconnect, lock out, and tag input power to the drive.

Step 2. Remove the drive cover and verify that no voltage is present at the drive’s AC input terminals, L1/181

Step 3. Remove jumpers J7 and J8 on the Regulator module. Se e figure 2.
Step 4. Orient the Torque Taper module over the area marked TORQUE TAPER on the Regulator module,

V erify that no voltage is present at the drive’s AC input terminals, L1/181 and L2/182. Failure to
observe this precaution could result in severe bodily injury or loss of life.

ATTENTION: The user is responsible for conforming with all applicable local, national, and
international codes. Failure to observe this precaution could result in damage to, or destruction
of, the equipment.

and L2/182.

just over the seven pins. Press down so that the pins pass through the guides on the Torque Taper
module. Use the mounting screw to secure it.

Step 5. On the Regulator module, adjust the Current Limit potentiometer counter-clockwise (CCW) to 100%,

or lower, depending on the application. It is shipped from the factory set at 150%. Dot No. 4 is
approximately 100%. Refer to figure 3.

Step 6. On the Torque Taper module, turn the CORE TORQUE potentiometer completely CCW. The core

torque setting provides a minimum winding torque, or mimimum strip tension, when the winding cycle
begins.

Step 7. On the Torque Taper module, turn the TORQUE TAP. ADJ. potentiometer completely CW. This

assures that excessive tension will not develop as the first coil or package is wound.

Important: The remaining steps assume that the complete drive system has been successfully started up

according to the instructions in the drive user manual. They provide a power-on test.
Note that an ammeter in the armature circuit is useful when adjusting both potentiometers on the

Torque T aper module. Abserving the ammeter, which shows current, and the growing coil diameter
gives visual confirmation whether the current (Torque) is increasing too fast or slow in relation to
the build-up.

Step 8. Thread the strip onto the winder and securely fasten it to the core. Remove all strip slack before the

drive is restarted.
Step 9. Set the Maximum Speed potentiometer for a safe maximum winder speed.
Step 10. Remove the lockout and tag. Apply power to the drive.
Step 11. Start the drive.

If the strip web breaks immediately, stop the drive. Reduce the Current Limit potentiometer (CCW

reduces current (torque).

2

Torque Taper Kit for Non-Regenerative FlexPak Plus and MinPak Plus DC Drives