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
G is
and -U
G is
and remains active until the value falls below the switch-on threshold.
•
The DC-bus voltage is set under C0173.
.
•
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
and the mains is switched off.
•
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.
efesotomasyon.com - Lenze
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