Mitsubishi Electronics FR-S500 Explanation of functions parameters, 2.3.1, Torque boost Pr

Explanation of functions (parameters)

2.3 Explanation of functions (parameters)

2.3.1	Torque boost (Pr. 0	, Pr. 46		)
Increase this value for use when the				voltage
inverter-to-motor distance is long or
motor torque is insufficient in the low
				Output
speed range (stall prevention is
activated).
Motor torque in the low-frequency		Pr.0
range can be adjusted to the load to			Setting range
		Pr.46
increase the starting motor torque.				0	Output frequency (Hz)

Parameter	Name	Factory Setting	Setting Range	Remarks
				The factory setting varies according
0	Torque boost	6%/5%/4%	0 to 15%	to the inverter capacity. (Refer to the
				following table for details.)
46	Second torque	- - -	0 to 15%,	- - -: Function invalid. Setting is
	boost		- - -	enabled when Pr. 30 = "1".

<Setting>

•Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.

Use the RT signal to switch between two different torque boosts. (Turn on the RT signal to make Pr. 46 valid(*).)

REMARKS

* The RT signal acts as the second function selection signal and makes the other second functions valid.

When using an inverter-dedicated motor (constant-torque motor), make setting as indicated below.

(If the factory set Pr. 71 value is changed to the setting for use with a constant-torque motor, the Pr. 0 setting changes to the corresponding value in the following table.)

Inverter Type	Inverter Capacity	Factory Setting	Constant-torque Motor Setting
FR-S520E	0.1K to 0.75K	6%	6% (no change)
FR-S510WE	1.5K to 3.7K		4%
	0.4K, 0.75K	6%	6% (no change)
FR-S540E	1.5K	5%	4%
	2.2K		3%
	3.7K	4%

CAUTION

•Selecting automatic torque boost control makes this parameter setting invalid.

•A too large setting may cause the motor to overheat or result in an overcurrent trip. The guideline is about 10% at the greatest.

♦Related parameters♦

•RT signal (second function "Pr. 46") setting⇒ Pr. 60 to Pr. 63 "input terminal function selection" (refer to page 98)

•Constant-torque motor setting ⇒ Pr. 71 "applied motor" (refer to page 69)

•Automatic torque boost control selection ⇒ Pr. 98 "automatic torque boost selection (motor capacity)" (refer to page 121)

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FUNCTIONS

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