Справочник Пользователя для Mitsubishi Electronics FR-A500
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4.2.46 RT signal activated condition selection (Pr. 155)
Pr. 155 "RT signal activated condition"
z
Set the condition of activating the RT terminal to select the second control functions by switching on-off the
RT signal.
<Setting>
Refer to the following list and set the parameters:
4.2.47 Stall prevention function and current limit function (Pr. 156)
Pr. 156 "stall prevention operation selection"
You can make setting to prevent the inverter from an overcurrent trip (prevent the high-response current
restriction from being activated) and/or set the OL signal output delay if stall prevention is activated by an
overcurrent or an excessive current flows due to sudden fluctuation of load, ON-OFF of the running inverter
output side, etc. An OL signal output delay can be set in Pr. 157.
restriction from being activated) and/or set the OL signal output delay if stall prevention is activated by an
overcurrent or an excessive current flows due to sudden fluctuation of load, ON-OFF of the running inverter
output side, etc. 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 restriction level.
flow exceeds the current restriction level.
High response current restriction
If the current exceeds the limit value, the output of the inverter is shut off to prevent an overcurrent.
Parameter
Number
Factory
Setting
Setting Range
155
0
0.10
Pr. 155 Setting
Description
0
Made valid immediately by switching the RT signal
on-off.
on-off.
10
Made valid only when the RT signal is on at constant
speed.(Invalid during acceleration/deceleration)
speed.(Invalid during acceleration/deceleration)
Parameter
Number
Factory Setting
Setting Range
156
0
0 to 31, 100, 101
Pr. 154 Refer to Pr. 22.
R elated param eters
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)
Pr. 44 to Pr. 49
(second function selection)
Pr. 81 "number of motor poles"
Pr. 180 to Pr. 186
(input terminal function selection)
R elated param eters
Pr. 22 "stall prevention operation level"
Pr. 23 "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"