Mitsubishi FR-S500 Instruction Manual download pdf (Page 78)

CAUTION

•* When "Operation not continued for OL signal output" is selected, the "OLT" alarm

code (stopped by stall prevention) is displayed and operation stopped.

(Alarm stop display "

• If the load is heavy, the lift is predetermined, or the acceleration/deceleration time

is short, the stall prevention may be activated and the motor not stopped in the

preset acceleration/deceleration time. Therefore, set optimum values to the Pr. 21

and stall prevention operation level.

• When the fast-response current limit has been set in Pr. 21 (factory setting),

torque will not be provided at the Pr. 22 setting of 170% or higher. At this time,

make setting so that the fast-response current limit is not activated.

• In vertical lift applications, make setting so that the fast-response current limit is

not activated. Torque may not be produced, causing a gravity drop.

CAUTION

Always perform test operation.

Stall prevention operation performed during acceleration may increase the

acceleration time.

Stall prevention operation performed during constant speed may cause sudden

speed changes.

Stall prevention operation performed during deceleration may increase the

deceleration time, increasing the deceleration distance.

.3.13 Stall prevention

Set the output current level at which the output frequency will be adjusted to

prevent the inverter from stopping due to overcurrent etc.

During high-speed operation above the rated motor frequency, acceleration

may not be made because the motor current does not increase. To improve

the operating characteristics of the motor in this case, the stall prevention level

can be reduced in the high frequency region. This function is effective for

performing operation up to the high speed range on a centrifugal separator

etc. Normally, set 60Hz <50Hz> in Pr. 28 "stall prevention operation reduction

starting frequency" and 100% in Pr. 23.

Parameter Name

Factory

Setting

Setting

Range

Remarks

Stall prevention operation

level

150% 0 to 200%



Stall prevention operation

level compensation factor

at double speed

- - -

0 to

200%, - - -

- - -: Pr. 22

equally

Stall prevention operation

reduction starting frequency

60Hz

<50Hz>

0 to

120Hz



Setting is

enabled

when

Pr. 30 = "1".

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 190 191

Comments to this Manuals

No comments

Mitsubishi FR-S500 Instruction Manual Page 78

Comments to this Manuals

Related products and manuals for Power supply units Mitsubishi FR-S500