Allen-Bradley 20A User Manual

24 Rockwell Automation Publication PFLEX-AT001L-EN-P - September 2017
Chapter 3 Evaluating the PowerFlex 7-Class Internal Resistor
2B. If P
ave
is greater than R
cont.
you will need to extend the cycle time (in
seconds) by the result of the following equation.
3. Find the correct constant temperature Power Curve for your drive type,
voltage and frame.
Power Curves for PowerFlex 70 Internal DB Resistors
OR
Power Curves for PowerFlex 700 Internal DB Resistors
4. Plot the point where the value of AL, calculated in Step 4 of Chapter 2, and
the desired deceleration time (t
3
– t
2
) intersect.
5. Plot the value of PL, calculated in Step 5 of Chapter 2, on the vertical axis
(0 seconds).
6. Connect AL at (t
3
– t
2
) and PL at 0 seconds with a straight line. This line is the
power curve described by the motor as it decelerates to minimum speed.
Drive Voltage Drive Frame(s) Figure Number
240 A and B 3
240 C
5
240 D
6
400/480 A and B
7
400/480 C
8
400/480 D
9
Drive Voltage Drive Frame Figure Number
400/480 0
15
400/480 1
16
400/480 2
17
400/480 3 Uses external DB resistors only.
Refer to
Chapter 4
P
b
2
------ Decel


R
cont
---------------------------------- seconds=

Allen-Bradley 20A Specifications

General

Brand	Allen-Bradley
Model	20A
Category	Controller
Language	English