Delta VFD-M-D series, User Manual, Page: 63 / 163

Chapter 5 Parameters
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VFD-M-D Series
5-30 Revision Jan. 2007, MDE2, SW V1.05
1 - 05 Minimum Output Frequency (Fmin) Unit: 0.01
Settings 0.10 to 400.0Hz Factory Setting: 0.50
This parameter sets the Minimum Output Frequency of the AC motor drive. This parameter
must be equal to or less than Mid-Point Frequency (Pr.1-03).
The settings of 1-03, 1-04, and 1-06 are invalid in Vector Control mode.
1 - 06 Minimum Output Voltage (Vmin) Unit: 0.1
Settings 230V series 0.1 to 255.0V Factory Setting: 1.7
This parameter sets the Minimum Output Voltage of the AC motor drive. This parameter must be
equal to or less than Mid-Point Voltage (Pr.1-04).
The settings of Pr.1-01 to Pr.1-06 have to meet the condition of Pr.1-02
≥
Pr.1-04
≥
Pr.1-06
and Pr.1-01
≥
Pr.1-03
≥
Pr.1-05.
1 - 07 Frequency Setting for Low Speed Operation Unit: 0.1
Settings 0.10 Hz to 400.0 Hz Factory Setting: 4.00
1 - 08 Acceleration Time for Low Speed Operation Unit: 0.1
Settings 0.1 to 3600 sec Factory Setting: 2.0
1 - 09 Deceleration Time for Low Speed Operation Unit: 0.1
Settings 0.1 to 3600 sec Factory Setting: 2.0
When using low speed function, external terminals MI1~MI5 should be set to 8. When the low
speed command is “ON”, the AC motor drive will accelerate from Minimum Output Frequency
(Pr.1-05) to Low Speed Frequency (Pr.1-07). When the low speed command is “OFF”, the AC
motor drive will decelerate from low speed Frequency to zero. The Accel/Decel time is set by
the Accel/Decel time for low speed operation (Pr.1-08, Pr.1-09).
Before using the Low speed command, the drive must be stopped first. And during Low Speed
operation, other operation commands cannot be accepted, except command via the
FORWARD, REVERSE and STOP keys on the digital keypad.