Lenze DDS Target 9300 Servo PLC V8.x - Manual (Page 88)

2.12 MCTRL_MotorControl (node number 131)
9300 Servo PLC
System blocks
2−82
L
9300 Servo PLC EN 5.1
2.12.17.6 LU − undervoltage monitoring
This function monitors the DC bus and protects the controller.
Error Monitoring function System variable Possible responses
No. Display TRIP Message Warning FAIL−QSP Off
x030 LU Undervoltage MCTRL_bUndervoltage_b ·
· Lenze setting
ü Setting possible
The monitoring responds if the DC−bus voltage at the terminals +U
G
and −U
G
falls below a switch−off
threshold dependent on C0173 and it remains active until the corresponding switch−on threshold has
again been exceeded.
·
The DC−bus voltage is set under C0173 ( ^ 2−80) .
·
The switch−off and switch−on thresholds dependent on C0173 can be gathered from the
following table:
Setting of C0173 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 defines the voltage level of the DC−bus voltage, at which the pulse
inhibit is activated.
Tip!
If the undervoltage lasts longer than 3 s or if the drive is powered up, this is entered into the fault
memory.
·
This can be the case if the control module is supplied externally via the terminals X5/39 and
X5/59 and the mains is switched off.
·
If the undervoltage has been eliminated (reconnection to the mains), the entry is not updated
in the fault memory but deleted because this is not an error but a controller status.
Undervoltages which last for less than 3 s are interpreted as a fault (e.g. power system fault) and
entered into the fault memory. In this case the fault memory is updated.