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(3) Operating procedure
Procedure for operation
Operation pattern
Power supply ON
Setting the parameters
Start inverter operation
Constant-speed bypass
operation
Deceleration (stop)
inverter operation
2)Signal ON/OFF after parameter setting
MRS
Power supply
OFF
ON
(OFF)
At start
OFF
ON
(inverter)
At constant
speed
ON
(commercial
power supply)
Switched to
inverter for
ON
deceleration
(inverter)
Stop
ON
CAUTION
Connect the control power supply (R1/L11, S1/L21) in front of input side MC1. If the control power supply is connected behind
input side MC1, the electronic bypass sequence function is not executed.
The electronic bypass sequence function is valid only when Pr. 135 = "1" in the external operation or combined operation mode
(PU speed command, external operation command Pr. 79 = "3"). When Pr. 135 = "1" in the operation mode other than the above,
MC1 and MC3 turn on.
When the MRS and CS signals are on and the STF (STR) signal is off, MC3 is on, but when the motor was coasted to a stop
from bypass operation last time, a start is made after the time set to Pr. 137 has elapsed.
Inverter operation can be performed when the MRS, STF (STR) and CS signals turn on. In any other case (MRS signal - ON),
bypass operation is performed.
When the CS signal is turned off, the motor switches to bypass operation. However, when the STF (STR) signal is turned off,
the motor is decelerated to a stop in the inverter operation mode.
When both MC2 and MC3 are off and either MC2 or MC3 is then turned on, there is a waiting time set in Pr. 136.
If electronic bypass sequence is valid (Pr. 135 = "1"), the Pr. 136 and Pr. 137 settings are ignored in the PU operation mode. The
input terminals (STF, CS, MRS, OH) of the inverter return to their normal functions.
When the electronic bypass sequence function (Pr. 135 = "1") and PU operation interlock function (Pr. 79 = "7") are used
simultaneously, the MRS signal is shared by the PU operation external interlock signal unless the X12 signal is assigned.
(When the MRS and CS signals turn on, inverter operation is enabled)
Changing the terminal function using any of Pr. 178 to Pr. 189, 190 to Pr. 196 may affect the other functions. Please make setting
after confirming the function of each terminal.
Parameters referred to
Pr. 11 DC injection brake operation time
Pr. 57 Restart coasting time
Pr. 58 Restart cushion time
Pr. 79 Operation mode selection
Pr. 178 to Pr. 189 (Input terminal function selection)
Pr. 190 to Pr. 196 (Output terminal function selection)
Pr. 135 = "1" (open collector output terminal of inverter)
Pr. 136 = "2.0s"
Pr. 137 = "1.0s" (Set the time longer than the time from when
MC3 actually turns on until the inverter and motor are
connected. If the time is short, a restart may not function
properly.)
Pr. 57 = "0.5s"
Pr. 58 = "0.5s" (Be sure to set this parameter when bypass
operation is switched to inverter operation.)
CS
STF
OFF
OFF
(OFF)
(OFF)
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
ON
OFF
Refer to page 100
Refer to page 136
Refer to page 136
Refer to page 175
Refer to page 110
Refer to page 116
Special operation and frequency control
MC1
MC2
OFF
ON
OFF
OFF
(OFF
ON)
(OFF)
(OFF
ON
OFF
ON
OFF
ON
ON
ON
ON
OFF
OFF
ON
OFF
MC3
Remarks
ON
External operation mode
ON)
(PU operation mode)
ON
MC2 turns on after MC3
turns off
OFF
(coasting status during this
period)
Waiting time 2s
MC3 turns on after MC2
turns off
ON
(coasting status during this
period)
Waiting time 4s
ON
4
235

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