Table 4-1 Parameter Block Definitions Level 1

Block Title

Parameter

Description

 

 

 

 

PRESET

Preset Speeds

Allows selection of 15 predefined motor operating speeds.

SPEEDS

#1 – #15

Each speed may be selected using external switches connected to the control

 

 

terminal strip (J4).

 

 

For motor operation, a motor direction command must be given along with a preset

 

 

speed command (at J4).

 

 

 

 

ACCEL/DECEL

Accel Time #1,2

Accel time is the number of seconds required for the motor to increase frequency at a

RATE

 

linear rate from 0 Hz to the frequency specified in the “Max Output Frequency”

 

 

parameter in the Level 2 Output Limits block.

 

Decel Time #1,2

Decel time is the number of seconds required for the motor to decrease frequency at a

 

 

linear rate from the frequency specified in the “Max Output frequency” parameter to 0

 

 

Hz.

 

S/C-Curve #1,2

S/C-Curve is a percentage of the total Accel or Decel time and provides smooth starts

 

 

and stops.

 

 

Figure 4-2 illustrates how motor acceleration is changed using a 40% S-Curve.

 

 

0% represents no “S” and 100% represents full “S” with no linear segment.

 

 

Example: Maximum Output frequency =100 Hz; Preset frequency = 50 Hz, Accel

 

 

Time=10 Sec.

 

 

In this example, control output frequency will be 50Hz 5 seconds after commanded.

 

 

Note: Accel #1, Decel #1 and S-Curve #1 are associated together. Likewise,

 

 

Accel #2, Decel #2 and S-Curve #2 are associated together. These

 

 

associations can be used to control any Preset frequency or External

 

 

Speed Command (Pot).

 

 

Note: Since the motor design uses rotor slip to produce torque, the motor speed

 

 

will not necessarily increase/decrease in a linear manner with motor

 

 

frequency.

 

 

Note: If faults (motor trips) occur during rapid Accel or Decel, selecting an S-curve

 

 

may eliminate the faults without affecting the overall ramp time. Some

 

 

adjustment of Accel, Decel and S-Curve settings may be necessary to

 

 

optimize your application.

 

 

C–curve is a selection (under S/C–curve) that allows different Accel/Decel characteristics.

 

 

 

 

JOG SETTINGS

Jog Speed

Jog Speed is the commanded frequency used during jog. Jog speed can be initiated

 

 

from the keypad or terminal strip. At the keypad, press JOG key and the FWD or

 

 

REV key. At the terminal strip, the JOG input (J4-12) and Forward (J4-9) or Reverse

 

 

(J4-10) must be closed and maintained.

 

 

Process control mode is different. If the terminal strip Process Mode input (J4-13) is

 

 

closed, pressing JOG (or closing J4-14) will cause the drive to move (without pressing

 

 

FWD or REV). The JOG input also acts as a RUN Command.

 

Jog Accel Time

Jog Accel Time is the Accel Time used during jog.

 

 

 

 

Jog Decel Time

Jog Decel Time is the Decel Time used during jog.

 

 

 

 

Jog S-Curve

Jog S-Curve is the S-Curve used during jog.

 

 

 

 

 

 

 

Figure 4-2 S-Curve Examples (40% S and C–curve)

 

 

40%

 

 

 

 

FrequencyOutput

 

Curve

 

 

FrequencyOutput

 

 

0%

20

 

20

 

 

%

 

 

 

 

Curve

 

 

 

 

 

 

 

%

 

 

20

 

 

 

 

 

%

 

 

 

 

 

0

Accel Time

 

Max

 

0

 

 

 

 

 

 

 

Accel S-Curves

 

 

 

40% Curve

0%

Curve

20

%

Decel Time

Max

Decel S-Curves

 

C–curve

 

 

 

 

 

Frequency

 

 

Frequency

 

C–curve

 

Output

 

 

Output

 

 

 

 

 

 

 

0

Accel Time

Max

 

0

Decel Time

Max

 

 

 

Accel C-Curve

Decel C-Curve

MN715

Programming & Operation 4-13

Page 62
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Baldor 15H, Inverter Control manual Parameter Block Definitions Level, Block Title Parameter Description, Decel Time #1,2

Inverter Control, 15H specifications

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