Section 1
General Information
Programming & Operation 4-13
MN715
Table 4-1 Parameter Block Definitions Level 1
Block Title
Parameter
Description
PRESET
SPEEDS
Preset Speeds
#1 – #15
Allows selection of 15 predefined motor operating speeds.
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
RATE
Accel Time #1,2
Decel Time #1,2
Accel time is the number of seconds required for the motor to increase frequency at a
linear rate from 0 Hz to the frequency specified in the “Max Output Frequency”
parameter in the Level 2 Output Limits block.
Decel time is the number of seconds required for the motor to decrease frequency at a
Decel Time #1,2
S-Curve #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-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.
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
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 Decel Time
Jog S-Curve
Jog Accel Time is the Accel Time used during jog.
Jog Decel Time is the Decel Time used during jog.
Jog S-Curve is the S-Curve used during jog.
Figure 4-2 40% S-Curve Example
Output Frequency
Accel Time
0
Max
Accel S-Curves
20
%
20
%
0%
Curve
40%
Curve
Output Frequency
Decel Time
0
Max
Decel S-Curves
20
%
20
%
0%
Curve
40%
Curve
