9300 Servo PLC
System blocks
2.13 Internal motor control (MCTRL_MotorControl)
2-58
9300ServoPLC EN 1.4
If the undervoltage (LU) message is present for more than 3 seconds or if the event is a power-on,
this is entered into the history buffer. This can be the case if the control module is supplied externally
by terminals X5/39 and X5/59 and the mains is switched off.
If the signal is reset (mains is reconnected) this is not entered in the history buffer, but only deleted
(this is not a fault, but acontroller state).
If the events are low voltage messages appearing only for less than 3 seconds, this is interpreted as
interference(e.g. mainssupply fault)and entered into thehistory buffer. Inthis case,thehistory buffer
is continued.
Features:
• LECOM no.: 1030
• Reaction: MESSAGE (cannot be modified)
2.13.13.2 Overvoltage (OU)
• This function monitors the DC-bus and protects the drive.
• The message is triggered by
MCTRL_bOvervoltage_b
=TRUE.
Supply voltage range Selection number
(C0173)
Switch-off threshold Switch-on threshold
< 400 V 0 770 V 755 V
400 V 1 770 V 755 V
400 0 460 V 2 770 V 755 V
480 V without brake chopper 3 770 V 755 V
Operation with brake chopper
(up to 480 V)
4 800 V 785 V
Function
The monitoring reacts if the DC-bus voltage (terminal +U
G
and -U
G
) goes above the threshold
(switch-off level)that was set by C0173.
The message is reset if the voltage falls below the switch-off threshold again.
The table above shows the setting of the switching thresholds according to the selection number.
Theswitch-off threshold determinesthe voltagelevel of theDC-bus voltageat whichthepulseinhibit
is activated.
The selection number is also effective for the undervoltage monitoring (LU).
(
^
2-57)
Features:
• LECOM no.: 1020
• Reaction: MESSAGE (cannot be modified)
Afrequent overvoltage message indicates anincorrect dimensioning of the drive(the braking energy
is excessive).
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