Mitsubishi Electric 800 Series Instruction Manual page 85

 Checking by the output of the inverter fault signal... (a)
When the inverter's protective function activates and the inverter trips, the Fault (ALM) signal is output. (Fault (ALM) signal is
assigned to terminal A1B1C1 in the initial setting). With this signal, check that the inverter operates properly. In addition,
negative logic can be set. (ON when the inverter is normal, OFF when the fault occurs.)
Inverter fault occurrence
(trip)
ALM
(when output
at NC contact)
RES
 Checking the inverter operating status by the inverter operation ready completion signal... (b)
Inverter operation ready (RY) signal is output when the inverter power is ON and the inverter becomes operative. Check if the
RY signal is output after powering ON the inverter.
 Checking the inverter operating status by the start signal input to the inverter and inverter
running signal... (c)
The Inverter running (RUN) signal is output when the inverter is running. (RUN signal is assigned to terminal RUN in the initial
setting.) Check if RUN signal is being output while inputting a start signal to the inverter. (STF signal is a forward rotation signal,
and STR is a reverse rotation signal.) Even after the start signal is turned OFF, the RUN signal is kept output until the inverter
makes the motor to decelerate and to stop. For the logic check, configure a sequence considering the inverter's deceleration
time.
Power ON
supply
STF
RH
Pr. 13 Starting
frequency
Reset
processing
RY
RUN
 Checking the motor operating status by the start signal input to the inverter and inverter
output current detection signal... (d)
The Output current detection (Y12) signal is output when the inverter operates and currents flows into the motor. Check if Y12
signal is being output while inputting a start signal to the inverter. (STF signal is a forward rotation signal, and STR is a reverse
rotation signal.) The Y12 signal is initially set to be output at 110% inverter rated current. Adjust the level to around 20% using
no load current of the motor as reference with Pr.150 Output current detection level. Like the inverter running signal (RUN
signal), even after the start signal is turned OFF, the Y12 signal is kept output until the inverter stops the output to a decelerating
motor. For the logic check, configure a sequence considering the inverter's deceleration time.
84
3. PRECAUTIONS FOR USE OF THE INVERTER
3.7 Failsafe system which uses the inverter
ON
OFF
OFF
ON
Reset processing
(about 1s)
Reset ON
ON OFF
ON
DC injection brake
operation point
DC injection
brake operation
ON OFF
ON OFF
Time
OFF
Time