Siemens SIMOVERT Master Drives 6SE70 Betriebsanleitung Seite 293

09.02
Bit 9: Inching 2 OFF command (L "Inching 2 OFF")
The command is executed with an L signal.
After the command has been accepted:
♦ An OFF 1 command is automatically executed (description, refer to control word bit 0).
Bit 10: Control from the PLC command (H "Control from the PLC")
The command is executed with an H signal
Process data PZD (control word, setpoints) originating from a PLC which were sent via the SST1 interface of
CU1, the CB/TB interface (option) and the SST/SCB interface (option), are only evaluated if the command was
accepted.
♦ If several interfaces are operational, only the process data of the interfaces are evaluated, which transmit the
H signal.
♦ For an L signal, the last values are retained in the appropriate dual port RAM of the interface.
An H signal appears in the visualization parameter r550 "control word 1", if one of the interfaces transmits an H
signal!
Bit 11: Ud reduction command (H "Ud reduction requested")
The command is executed with an H signal.
After the command has been accepted:
♦ The DC link voltage setpoint drops to the value set with P318:
Setpo int
If the value of P330 is even, Ud setpoint lowering takes place abruptly. If it is odd, the setpoint is ramped
down according to the discharge time in P330.
♦ The DC link should now discharge.
♦ When the DC link voltage drops below the following threshold value
. 1 35 U
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the message "Ud reduced" (status word 1, bit 13) is issued.
♦ The appearance of a trailing edge of the Ud reduction command causes the output of the ramp-up/return
element (precharging time P329) to be set to the current value of DC link voltage so that the DC link voltage
setpoint can ramp up again from this value.
♦ The L signal of the Ud reduction command causes the "Ud reduced" message (status word 1, bit 13) to be
held low (regardless of the DC link voltage level)
Siemens AG 6SE7087-6AK85-0AA0
Common Rectifier Operating Instructions
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. 1 35 U
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Supply , rectifier
P 318
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Supply , rectifier
100 . 00 %
P 318
100 . 00 %
2 %
+
. 1 35 P 071
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100 %
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