Hitachi X200 Series instruction manual Nec

		A−5
Jogging Operation	Usually done manually, a jog command from an operator’s panel
	requests the motor/drive system to run indefinitely in a particular
	direction, until the machine operator ends the jog operation.		Appendix
Jump Frequency	A jump frequency is a point on the inverter output frequency range
	that you want the inverter to skip around. This feature may be used		A
	to avoid a resonant frequency, and you can program up to three jump
	frequencies in the inverter.
Line Reactor	A three-phase inductor generally installed in the AC input circuit of
	an inverter to minimize harmonics and to limit short-circuit current.
Momentum	The physical property of a body in motion that causes it to remain in
	motion. In the case of motors, the rotor and attached load are rotating
	and possesses angular momentum.
Multi-speed	The ability of a motor drive to store preset discrete speed levels for
Operation	the motor, and control motor speed according to the currently selected
	speed preset. The Hitachi inverters have 16 preset speeds.
Motor Load	In motor terminology, motor load consists of the inertia of the
	physical mass that is moved by the motor and the related friction
	from guiding mechanisms. See also Inertia.
NEC	The National Electric Code is a regulatory document that governs
	electrical power and device wiring and installation in the United
	States.
NEMA	The National Electric Manufacturer’s Association. NEMA Codes are
	a published series of device ratings standards. Industry uses these to
	evaluate or compare the performance of devices made by various
	manufacturers to a known standard.
Open-collector	A common logic-type discrete output that uses an NPN transistor
Outputs	that acts as a switch to a power supply common, usually ground. The
	transistor’s collector is open for external connection (not connected
	internally). Thus, the output sinks external load current to ground.
Power Factor	A ratio that expresses a phase difference (timing offset) between
	current and voltage supplied by a power source to a load. A perfect
	power factor = 1.0 (no phase offset). Power factors less than one cause
	some energy loss in power transmission wiring (source to load).
PID Loop	Proportional - Integral-Derivative - A mathematical model used for
	process control. A process controller maintains a process variable
	(PV) at a setpoint (SP) by using its PID algorithm to compensate for
	dynamic conditions and vary its output to drive the PV toward the
	desired value. For variable-frequency drives, the process variable is
	the motor speed. See also Error.