YASKAWA VS-626M5 Instruction Manual page 79

Control Signals
4.1.4 Details on Sequence Input Signals
4
Speed Reference
Operation signals
When the FWD or REV signal is turned OFF while the motor is in operation, the motor will stop due
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to regenerative braking. When the motor speed reaches zero, the gate will be blocked and the motor
current will be shut off.
The acceleration and deceleration time between a stopped state and 100% rotation (C1-26) can be set
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with C1-10, the soft start time constant (T
tion time may be, however, longer than the soft start set time due to the load inertial moment.
Turn ON the FWD or REV signal at least 15 ms after the EMG and RDY signals are turned ON. The
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FWD or REV signal will be unacceptable if it is turned ON before the EMG and RDY signals are turned
ON.
The motor will stop if the FWD and REV signals are turned ON simultaneously by mistake. Be aware
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that the motor will start operating immediately after either of the signals is turned OFF.
When the FWD or REV signal is turned ON, the motor will rotate according to the speed reference.
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Set the speed reference in advance.
If a fault occurs while the motor is in operation, the gate will be blocked immediately and the motor
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current will be shut off.
Keep the FWD and REV signals turned OFF when the motor is ON. The motor will not operate while
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the FWD and REV signals are ON.
EMG (Emergency Stop Signal)
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The EMG signal functions when 6CN-7 turns OFF.
The main circuit capacitor will be charged after the EMG signal is turned ON. The motor will be ready
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to operate a maximum of 2.5 s after the EMG signal is turned ON. Do not attempt to charge the capaci-
tor repeatedly within a short period of time, or otherwise the charging circuit will deteriorate quickly.
Allow a sufficient interval to charge the capacitor again.
When the EMG signal is turned OFF, the motor will stop promptly due to regenerating braking and
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the current will be shut off. If the motor does not stop, the current will be shut off automatically 10 s
after the EMG signal is turned OFF. At that time, the protective function will operate and "AL-21"
(emergency stop failure) will be displayed.
C1-10 (soft start time setting) will be disabled when an emergency stop failure occurs.
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If the EMG signal is turned OFF, the motor will not operate when the EMG signal turns ON again un-
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less the FWD, REV, and ORT signals are turned OFF.
While the motor is decelerated in emergency stop operation, the motor will coast to a stop with no re-
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generation breaking if the magnetic contactor on the Converter input shuts off the main circuit power
supply. At that time, the main circuit low-voltage protective function will operate and a fault will be
indicated.
To prevent the motor from coasting to a stop when shutting off the main circuit power supply in emer-
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gency stop operation, use the OFF-delay circuit to delay the timing of shutting off the main circuit pow-
er supply.
Always turn ON the EMG signal if it is not used. If the 0 V common or 24 V common input method
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is selected, connect 6CN-7 to 6CN-19. If the external common input method is selected, always turn
the EMG signal ON externally.
[FWD]
[REV]
) between 0.1 and 180.0 s. The acceleration and decelera-
SFS
[EMG]
ON
[RDY]
ON
[FWD] or [REV]
ON
15 ms min.
Speed reference
[FWD] or [REV]
ON
4 -4
+
CCW (Forward) CW (Reverse)
CW (Reverse) CCW (Forward)
−