RUN command
FW, RV
EXT terminal input
Motor rotation speed
RS (reset) input
AL output
(Alarm signal)
Free-run
If the RUN command is being input when the alarm is cleared by a reset after a trip, operation is start-
ed in accordance with the frequency reference. To prevent operation from being started unintentional-
ly, set the start check function to enabled. For details on the start check function, refer to
Start Check
Function (When (H96) = “2,” “4”) on page 7-81.
7-8-5
Thermistor Trip Function
You can provide thermal protection for external equipment such as a motor by connecting a thermistor
installed on it to the inverter and enabling this function.
Parameter No. Function name Data
Default
data
Unit
H26
Thermistor Function Se-
lection (MOH)
0: Disable
0 -
1: Inverter immediately trips with OH4 dis-
played
2: Inverter issues output signal MOH and
continues to run
H27
1st Thermistor Error De-
tection Level (MOH)
0.00 to 5.00
1.60 V
E20, E21, E27
Output Terminal [DO1]
Function Selection, Out-
put T
erminal [DO2]
Function Selection, Out-
put Terminal [ROA,
ROB] Function Selection
56: MOH (Motor overheat detected by ther-
mistor)
-
-
Related function
Output Terminal [DO1] ON Delay Time (H309)
Output Terminal [DO2] ON Delay Time (H31
1)
Output Terminal [ROA, ROB] ON Delay Time (H313)
Output Terminal[DO1] OFF Delay Time (H310)
Output Terminal[DO2] OFF Delay Time (H312)
Output Terminal [ROA, ROB] OFF Delay Time (H314)
Connect a PTC thermistor between the [PTC] terminal and the [AIC] terminal. If, as a result of the re-
sistance value of the connected PTC thermistor, the internal power supply is divided, and the voltage
between the [PTC] terminal and the [AIC] terminal exceeds 1st Thermistor Error Detection Level
(MOH) (H27), operation set at Thermistor Function Selection (MOH) (H26) is performed. Take thermis-
tor error into consideration when setting the 1st Thermistor Error Detection Level (MOH) (H27). If the
resistance value of a PTC thermistor at the protection temperature is considered as Rp, the operation
level V
OH
is calculated by the formula below.
7 Other Functions
7-88
M1 Series Standard Type User's Manual (I669)
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