Delta Electronics VFD-M manual Frequency Hold

Chapter 4 Parameters

Frequency Hold

Applications	Purpose	Functions	Related
			Parameters
General application	Acceleration/	Hold output frequency during	Pr.39~Pr.42
	deceleration pause	Acceleration/deceleration
Auto Restart after Fault
Applications	Purpose	Functions	Related
			Parameters
	For continuous and	The AC motor drive can be	Pr.72
Air conditioners,	reliable operation	restarted/reset automatically up to 10	Pr.113
remote pumps	without operator	times after a fault occurs.
	intervention
Emergency Stop by DC Braking
Applications	Purpose	Functions	Related
			Parameters
	Emergency stop	AC motor drive can use DC braking	Pr.28
High-speed rotors		for emergency stop when quick stop is	Pr.30
	without brake	needed without brake resistor. When	Pr.31
	resistor	used often, take motor cooling into
		consideration.
Over-torque Setting
Applications	Purpose	Functions	Related
			Parameters
		The over-torque detection level can be	Pr.60~Pr.62
	To protect	set. Once OC stall, OV stall and over-
Pumps, fans and		torque occurs, the output frequency
	machines and to
		will be adjusted automatically. It is
extruders	have continuous/
		suitable for machines like fans and
	reliable operation
		pumps that require continuous
		operation.
Upper/Lower Limit Frequency
Applications	Purpose	Functions	Related
			Parameters
	Control the motor	When user cannot provide	Pr.36
Pump and fan		upper/lower limit, gain or bias from	Pr.37
	speed within
	upper/lower limit	external signal, it can be set
		individually in AC motor drive.

4-16 Revision May 2008, ME14, SW V3.04