Mitsubishi FR-A800

(A) Application parameters
468
PARAMETERS
• Example of operation sequence with automatic bypass sequence (Pr.139  "9999", Pr.159  "9999")
Operation
• Procedure for operation
• Signal operation after setting parameters
Status MRS CS STF MC1 MC2 MC3 Remarks
Power ON
OFF
(OFF)
OFF
(OFF)
OFF
(OFF)
OFFON
(OFFON)
OFF
(OFF)
OFFON
(OFFON)
External operation mode
(PU operation mode)
At start
(Inverter)
OFFON OFFON OFFON ON OFF ON
During constant-
speed operation
(commercial power
supply)
ON ONOFF ON ON OFFON ONOFF
MC2 turns ON after MC3
turns OFF.
Waiting time is 2 s (while
coasting).
For deceleration,
switched to the
inverter operation
(inverter)
ON OFFON ON ON ONOFF OFFON
MC3 turns ON after MC2
turns OFF.
Waiting time is 4 s (while
coasting).
Stop ON ON ONOFF ON OFF ON
STF
Frequency command
Output frequency
Pr.139
Pr.159
Time
Time
Actual motor speed
A : Pr.136 MC switchover interlock time B : Pr.137 Start waiting time
C : Pr.57 Restart coasting time D : Pr.58 Restart cushion time
MC3
ON
OFF
ON
OFF
MC2
ON
OFF
C
AAB C D AAB C D
INV
operation
Commercial
power supply
operation
Power supply ON
Setting the parameters
Start inverter operation
Constant-speed commercial
power supply operation
Deceleration (stop)
inverter operation
• Pr.135 = "1" (open collector output terminal of inverter)
• Pr.136 = "2.0 s"
• Pr.137 = "1.0 s" (Set the time until MC3 is actually turned ON
and the inverter and motor are electrically connected. If the
time is short, the restart may not function properly.)
• Pr.57 = "0.5 s"
• Pr.58 = "0.5 s" (Always set this to switchover from the
commercial power supply operation to the inverter operation.)