Mitsubishi Electric 800 Series Instruction Manual page 453

(A) Application parameters
• Example of operation sequence with automatic bypass sequence (Pr.139  "9999", Pr.159  "9999")
ON
STF
OFF
Output frequency Pr.139
Frequency command
Actual motor speed
INV
ON
MC3
operation
OFF
Commercial
ON
MC2
power supply
OFF
operation
A : Pr.136 MC switchover interlock time
C : Pr.57 Restart coasting time
Operation
• Operation flowchart
Power supply ON
Setting the parameters
Start inverter operation
Constant-speed commercial
power supply operation
Deceleration (stop)
inverter operation
• Signal operation after setting parameters
Status MRS
OFF
Power ON
(OFF)
At start
OFFON
(Inverter)
During constant-
speed operation
ON
(commercial power
supply)
For deceleration,
switched to the
ON
inverter operation
(inverter)
Stop ON
452
PARAMETERS
C A A
B : Pr.137 Start waiting time
D : Pr.58 Restart cushion time
CS STF
OFF OFF
(OFF) (OFF)
OFFON OFFON
ONOFF ON
OFFON ON
ON ONOFF
Pr.159
B C D A
• Pr.135 = "1"
• 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.)
MC1 MC2
OFFON OFF
(OFFON) (OFF)
ON OFF
ON OFFON
ON ONOFF
ON OFF
A B C D
MC3 Remarks
OFFON External operation mode
(OFFON) (PU operation mode)
ON
MC2 turns ON after MC3
turns OFF.
ONOFF
Waiting time is 2 s (while
coasting).
MC3 turns ON after MC2
turns OFF.
OFFON
Waiting time is 4 s (while
coasting).
ON
Time
Time