KB Electronics KBDF-48 - Manual (Page 30)

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8.4.2 FREQUENCY CONTROL
The drive's output frequency can be controlled by various methods:
1. Analog Input (Voltage following, Current Following). See Section 8.4.2.1, below.
2. Remote Main Speed Potentiometer. See Section 8.4.2.2, on page 32.
3. Up/Down Frequency Control (using the Multi-Function Input Terminals). See Section 8.4.2.3,
on page 34.
4. Preset Frequency (using the Multi-Function Input Terminals). See Section 8.4.2.4, on page
37.
5. Modbus Communication using the optional DIDF RS-232 and RS-485 Modbus RTU
Communication Module. See Appendix B, on page 67.
8.4.2.1 ANALOG INPUT
An analog voltage (unidirectional or bidirectional), current, or PWM signal input can be used to
control motor speed in lieu of the Keypad. The drive output will linearly follow the signal input.
The inputs can be programmed for the desired gain, slope, offset, and response time. See
Figure 20, on page 31, for the location of the Signal Input Type Selection Jumper J2.
Operation with a Positive Slope Signal: When the signal input is increased, the drive output
frequency will increase. When the signal input is decreased, the drive output frequency will
decrease. See Figure 18.
Operation with a Negative Slope Signal: When the signal input is increased, the drive output
frequency will decrease. When the signal input is decreased, the drive output frequency will
increase. See Figure 19.
FIGURE 18
ANALOG INPUT SIGNAL GAIN
AND OFFSET WITH POSITIVE SLOPE
(LOW-TO-HIGH SIGNAL)
(FUNCTION 9.01 SET TO "0000")
FIGURE 19
ANALOG INPUT SIGNAL GAIN
AND OFFSET WITH NEGATIVE SLOPE
(HIGH-TO-LOW SIGNAL)
(FUNCTION 9.01 SET TO "0001")