Table of Contents
Advertisement
Failsafe of the system which uses the inverter
4)Checking the motor operating status by the start signal input to the inverter and inverter output current detection signal.
The output current detection (Y12) signal is output when the inverter operates and currents flows in the motor. Check if
the Y12 signal is output when inputting the start signal to the inverter (forward signal is STF signal and reverse signal is
STR signal). Note that the current level at which Y12 signal is output is set to 150% of the inverter rated current in the
initial setting, it is necessary to adjust the level to around 20% using no load current of the motor as reference with Pr.150
Output current detection level.
For logic check, as same as the inverter running (RUN) signal, the inverter outputs for the period from the inverter
decelerates until output to the motor is stopped, configure a sequence considering the inverter deceleration time.
Output
Pr. 190, Pr. 192, Pr. 197 Setting
Positive logic Negative logic
Signal
ALM
99
RY
11
RUN
0
Y12
12
NOTE
Changing the terminal assignment using Pr. 190, Pr. 192, and Pr. 197 (output terminal function selection) may affect the
other functions. Set parameters after confirming the function of each terminal.
(2) Backup method outside the inverter
Even if the interlock is provided by the inverter status signal, enough failsafe is not ensured depending on the failure
status of the inverter itself. For example, when the inverter CPU fails, even if the interlock is provided using the inverter
fault signal, start signal and RUN signal, there is a case where a fault signal is not output and RUN signal is kept output
even if an inverter fault occurs.
Provide a speed detector to detect the motor speed and current detector to detect the motor current and consider the
backup system such as checking up as below according to the level of importance of the system.
1)Start signal and actual operation check
Check the motor running and motor current while the start signal is input to the inverter by comparing the start signal to
the inverter and detected speed of the speed detector or detected current of the current detector. Note that the motor
current runs as the motor is running for the period until the motor stops since the inverter starts decelerating even if the
start signal turns OFF. For the logic check, configure a sequence considering the inverter deceleration time. In addition, it
is recommended to check the three-phase current when using the current detector.
2)Command speed and actual operation check
Check if there is no gap between the actual speed and commanded speed by comparing the inverter speed command
and detected speed of the speed detector.
System failure
54
When using various signals, assign functions to Pr.190,
199
111
100
112
Controller
Inverter
(speed, temperature,
To the alarm detection sensor
Pr.192, and Pr.197 (output terminal function selection) referring to
the table on the left.
Sensor
air volume, etc.)
Advertisement
Table of Contents
