Rockwell Automation MinPak Plus DC Drives Kits User Manual

Page 23

If the 10 setting on the SPEED dial is lower than the deĆ

sired speed, increase the setting on the Maximum Speed

potentiometer to the necessary speed by turning the poĆ

tentiometer CW.

DANGER

USE ONLY ONE HAND TO HOLD THE SCREWĆ

DRIVER. KEEP YOUR OTHER HAND BEHIND

YOU. DO NOT USE YOUR OTHER HAND TO

BRACE YOURSELF AGAINST THE CONTROLĆ

LER, PANEL OR ENCLOSURE. PERSONAL INĆ

JURY COULD RESULT IF YOU ACCIDENTALLY

TOUCH A COMPONENT AT LINE VOLTAGE.

Step 9 Ċ A further adjustment may be needed, but it

should be performed after completing Step 5 in ParaĆ

graph 4.4.3. Note that the maximum and minimum

speed adjustments are interactive: a change in one afĆ

fects the other.
Step 10 Ċ Check the maximum speed with the FORĆ

WARD/ REVERSE selector switch in the REVERSE posiĆ

tion since it may be somewhat different than the

FORWARD speed. Adjust the Maximum Speed potenĆ

tiometer if necessary.
4.4.3 Minimum Speed (Voltage) Ċ The Minimum

Speed potentiometer on the Regulator has been factory

preset for zero speed. By means of adjustment, this

speed may be raised or lowered. The result is the lowest

moving speed the operator can set on the SPEED dial.

The control range is 0 to 50% of rated speed.
Again, the motor speed can be determined by a tachomĆ

eter or by visual inspection of machine operation.
Step 1 Ċ Be sure the selector switches on the Operator

Station are in positions outlined in Paragraph 4.4.2,

Steps 1, 2 and 3. Then put the START/STOP rocker

switch in the START position to start the drive.
Step 2 Ċ Place the SPEED dial at 0 (zero) position.
Step 3 Ċ Locate the Minimum Speed potentiometer on

the Regulator Module. (Refer to Figure 4.7.) The letters

MINSPD are printed next to it.
Step 4 Ċ Using a small, insulated slot screwdriver, careĆ

fully turn the Minimum Speed potentiometer until the deĆ

sired minimum is reached. Note that CW represents an

increase; CCW represents a decrease.
Step 5 Ċ Carefully recheck the maximum speed adjustĆ

ment for desired setting. Since the maximum and miniĆ

mum speed adjustments are interactive, a change Ink

one affects the other . At times, it may be necessary to

work back and forth for precise adjustments.
Step 6 Ċ Check the minimum speed with the FORĆ

WARD/ REVERSE selector switch in the REVERSE posiĆ

tion since it may be somewhat different than the FORĆ

WARD speed. Adjust the Minimum Speed potentiometer

if necessary.
Step 7 Ċ Press the STOP rocker switch.

4.4.4 Acceleration/Deceleration Rates Ċ The RATE 1

and RATE 2 potentiometers on the Regulator Module are

provided to adjust FORWARD and REVERSE acceleraĆ

tion rates, respectively. RATE 1 also controls the decelĆ

eration rate when in the REVERSE mode, and RATE 2

controls the deceleration rate when in the FORWARD

mode.
These potentiometers have been factory preset for a typiĆ

cal linear acceleration rate of 6 seconds to maximum

speed. This time can be adjusted over a range of 0.5 to

30 seconds from a fully stopped condition.
Step 1 Ċ Be sure that the selector switches on the OperĆ

ator Station are in the positions outlined in Paragraph

4.4.2, Steps 1, 2 and 3.
Step 2 Ċ Place the SPEED dial in the 10 position.
Step 3 Ċ Put the START/STOP rocker switch in the

START position.
Step 4 Ċ Have a handĆheld tachometer or stopwatch

held by a helper. Alternately, have an oscilloscope or

chart recorder set up. On the Operator Control Station,

press the START switch. Determine if the rate of acceleraĆ

tion is acceptable. If it is, proceed to Step 9. If not, continĆ

ue with these steps.
Step 5 Ċ Locate the RATE 1 potentiometer on the ReguĆ

lator Module. (Refer to Figure 4.7.)
Step 6 Ċ Using a small insulated slot screwdriver, careĆ

fully turn the RATE 1 potentiometer a quarter turn. (CW

represents an increase; CCW represents a decrease.)
Step 7 Ċ Repeat Step 4. if the rate is acceptable, move

on to Step 9. If the rate needs more adjustment, repeat

Step 6.
Step 8 Ċ Press the STOP rocker switch.
Step 9 Ċ Repeat Steps 1 thru 8 with the FORWARD/ REĆ

VERSE selector switch in the REVERSE position. Use the

RATE 2 potentiometer on the Regulator Module.
NOTE: RATE 1 and RATE 2 also control deceleration in

REVERSE and FORWARD modes, respectively. The rate

of deceleration can be timed with a tachometer and stopĆ

watch for slower rates. An oscilloscope or chart recorder

can be used for faster rates. For a controlled deceleraĆ

tion. the motor must be loaded such that it does not coast

during the deceleration period.
4.4.5 Current Limit Ċ Current Limit #1 and Current LimĆ

it #2 potentiometers are provided for separate adjustĆ

ment of the forward (+) and reverse (-) current limits, reĆ

spectively. Although it will probably not be necessary to

make any adjustment in the factoryĆset current limit valĆ

ues of 150% of rated load, it is possible to change this

governing value. (Individual application speed changes

or load changes on sustained overloads may require

readjustment. Also, ones requiring torque limiting or acĆ

celerating of high inertia loads may require a change

from this value.)
To reduce the torque output of the drive, turn the Current

Limit potentiometers CCW. Note, however, that turning

CCW too far may prevent the drive accelerating to the deĆ

sired speed.