Delta Electronics VFD-EL manual 01.08, 01.09, 01.10, 01.11, 01.12

			Chapter 4 Parameters
01.08	Output Frequency Lower Limit			Unit: 0.1
	Settings	0.0 to 100.0%		Factory Setting: 0.0

The Upper/Lower Limits are to prevent operation errors and machine damage.

If the Output Frequency Upper Limit is 50Hz and the Maximum Output Frequency is 60Hz, the Output Frequency will be limited to 50Hz.

If the Output Frequency Lower Limit is 10Hz, and the Minimum Output Frequency (Pr.01.05) is set to 1.0Hz, then any Command Frequency between 1.0-10Hz will generate a 10Hz output from the drive. If the command frequency is less than 1.0Hz, drive will be in ready status without output.

This parameter must be equal to or less than the Output Frequency Upper Limit (Pr.01.07). The Output Frequency Lower Limit value = (Pr.01.00 * Pr.01.08) /100.

01.09	Acceleration Time 1 (Taccel 1)		Unit: 0.1/0.01
01.10	Deceleration Time 1 (Tdecel 1)		Unit: 0.1/0.01
01.11	Acceleration Time 2 (Taccel 2)		Unit: 0.1/0.01
01.12	Deceleration Time 2 (Tdecel 2)		Unit: 0.1/0.01
	Settings	0.1 to 600.0 sec / 0.01 to 600.0 sec	Factory Setting: 10.0

Acceleration/deceleration time 1 or 2 can be switched by setting the external terminals MI3~ MI12 to 7 (set Pr.04.05~Pr.04.08 to 7 or Pr.11.06~Pr.11.11 to 7).

01.19 Accel/Decel Time Unit

Factory Setting: 0

Settings	0	Unit: 0.1 sec
	1	Unit: 0.01 sec

The Acceleration Time is used to determine the time required for the AC motor drive to ramp from 0 Hz to Maximum Output Frequency (Pr.01.00). The rate is linear unless S-Curve is “Enabled”; see Pr.01.17.

The Deceleration Time is used to determine the time required for the AC motor drive to decelerate from the Maximum Output Frequency (Pr.01.00) down to 0 Hz. The rate is linear unless S-Curve is “Enabled.”, see Pr.01.18.

The Acceleration/Deceleration Time 1, 2, 3, 4 are selected according to the Multi-function Input Terminals Settings. See Pr.04.05 to Pr.04.08 for more details.

Revision August 2008, 2ELE, V1.02 4-33