9300 Servo PLC
System blocks
2.12 MCTRL_MotorControl
2-60
L
ServoPLC EN 2.0
2.12.17.5 LU - undervoltage monitoring
This function monitors the DC-bus and protects the controller.
No. Monitoring function Display System variable TRIP Message Warning Off
030 Undervoltage LU MCTRL_bUndervoltage_b •
• Default setting ü Setting possible
The monitoring reacts if the DC-bus voltage exceeds a threshold set under C0173 at the terminals
-U
Gis
and -U
Gis
and remains active until the value falls below the switch-on threshold.
• The DC-bus voltage is set under C0173. (^ 2-58) .
• The switch-on and switch-off thresholds depending on C0173 can be obtained from the table:
C0173 threshold Switch-off threshold Switch-on threshold
0 Mains < 400 V; with or without brake unit 285 V 430 V
1 Mains = 400 V; with or without brake unit 285 V 430 V
2 Mains = 460 V; with or without brake unit 328 V 473 V
3 Mains = 480 V; without brake unit 342 V 487 V
4 Mains = 480 V; with brake unit 342 V 487 V
• The switch-off threshold determines the voltage level of the DC-bus voltage at which the pulse
inhibit is activated.
Tip!
If the undervoltage message is applied for more than 3 seconds or if the mains is connected, 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
andthemainsisswitchedoff.
• If the undervoltage has been eliminated (mains connected) the entry will not be entered into
the history buffer but deleted because it is not an error but a controller status.
Undervoltages which are applied for less than 3 s, are interpreted as error (e.g. mains error) and ent-
ered into the history buffer. The history buffery will be continued.
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