Mitsubishi FR - S500 instruction manual Explanation of Functions Parameters, Torque boost, Setting

2.3 Explanation of Functions (Parameters)

2.3.1 Torque boost

Increase this value for use when the inverter-to-motor distance is long or motor torque is insufficient in the low speed range (stall prevention is activated).

Motor torque in the low-frequency range can be adjusted to the load to increase the starting motor torque.

	Output voltage
Pr.0	Setting range
Pr.46

0 Output frequency (Hz)

Parameter	Name	Factory	Setting	Remarks
		Setting	Range
				(Note) FR-S520 (S)-0.1K to 3.7K: 6%
		6%/5%/4%		FR-S540-0.4K, 0.75K: 6%
0	Torque boost		0 to 15%	FR-S510W-0.1K to 0.75K: 6%
		(Note)		FR-S540-1.5K, 2.2K: 5%
				FR-S540-3.7K: 4%
46	Second torque boost	- - -	0 to 15%,	- - -: Function invalid. Setting is
			- - -	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.

•FR-S520-0.1K to 0.75K ..... 6%, FR-S520-1.5K to 3.7K ..... 4%

•FR-S540-0.4K, 0.75K ..... 6%, FR-S540-1.5K ..... 4%, FR-S540-2.2K, 3.7K ..... 3%

•FR-S520S-0.1K to 0.75K ..... 6%, FR-S520S-1.5K ..... 4%

•FR-S510W-0.1K to 0.75K ..... 6%

If you leave the factory setting as it is and change the Pr. 71 value to the setting for use of the constant-torque motor, the Pr. 0 setting changes to the above value.

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 88)

Constant-torque motor setting ⇒ Pr. 71 "applied motor" (refer to page 93)

Automatic torque boost control selection ⇒ Pr. 98 "automatic torque boost selection (motor capacity)" (refer to page 109)

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