Mitsubishi Electric FR-E700 Instruction Manual page 85

Operation
Output terminal function assignment
When using various signals, assign functions to Pr. 190 to Pr. 192 (output terminal function
selection) referring to the table below.
Output Signal
ALM
RY
RUN
Y12
Tab. 4-2: Setting in positive and negative logic
NOTE Changing the terminal assignment using Pr. 190 to Pr. 192 "Output terminal function selec-
tion" may affect the other functions. Make setting after confirming the function of each termi-
nal.
Backup method outside the inverter
Even if the interlock is provided by the inverter status signal, enough failsafe is not ensured de-
pending on the failure status of the inverter itself. For example, even if the interlock is provided
using the inverter fault output signal, start signal and RUN signal output, there is a case where
a fault output 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 cur-
rent and consider the backup system such as checking up as below according to the level of im-
portance of the system.
● 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.
● 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.
Fig. 4-4: Backup method outside the inverter
FR-E700 EC
System failure
190 to 192 Setting
Positive Logic
99
11
0
12
Controller
Inverter
air volume, etc.)
To the alarm detection sensor
Precautions for use of the inverter
Negative Logic
199
111
100
112
Sensor
(speed,
temperature,
I001879E
4 - 5