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Rt Signal Activated Condition Selection (pr. 155); Stall Prevention Function And Current Limit Function (pr. 156) - Mitsubishi Electric FR-A500 Instruction Manual

Transistorized inverter.
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4.2.46 RT signal activated condition selection (Pr. 155)

Pr. 155 "RT signal activated condition"
Set the condition of activating the RT terminal to select the second control functions by switching on-off the
RT signal.
Parameter
Factory
Number
Setting
155
0
<Setting>
Refer to the following table and set the parameters:
Pr. 155 Setting
0
Made valid immediately by switching the RT signal on-off.
Made valid only when the RT signal is on at constant
10
speed.(Invalid during acceleration/deceleration)

4.2.47 Stall prevention function and current limit function (Pr. 156)

Pr. 156 "stall prevention operation selection"
You can make setting to prevent stall caused by overcurrent and/or to prevent the inverter from resulting in
an overcurrent trip (to disable fast-response current restriction that limits the current) when an excessive
current flows due to sudden load fluctuation or ON-OFF on the output side of a running inverter. An OL signal
output delay can be set in Pr. 157.
Stall prevention
Automatically change the output speed of the inverter to reduce the amount of current when the current
flow exceeds the current limit level.
Fast response current limit
Shut off the output of the inverter to prevent overcurrent when the current flows exceeds the current
restriction value.
Parameter
Factory Setting
Number
156
0
Setting Range
0, 10
Description
Setting Range
0 to 31, 100, 101
151
PARAMETERS
Related parameters
Pr. 14 "load pattern selection"
Pr. 44 to Pr. 49
(second function selection)
Pr. 81 "number of motor poles"
Pr. 180 to Pr. 186
(input terminal function selection)
Related parameters
Pr. 22 "stall prevention operation level"
Pr. 23 "stall prevention operation level
compensation factor at double speed"
Pr. 48 "second stall prevention operation
current"
Pr. 49 "second stall prevention operation
frequency"
Pr. 114 "third stall prevention operation
current"
Pr. 115 "third stall prevention operation
frequency"
Pr. 154 "voltage reduction selection
during stall prevention operation"
Pr. 157 "OL signal output waiting time"
4

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