Siemens SINUMERIK 840D sl Function Manual page 2059

DB31, ...
DBX95.0
VDC link < warning threshold
Edge evaluation: no
Signal state 1 or The drive signals the PLC that the DC link voltage VDC link has dropped below the DC link
edge change undervoltage warning threshold.
0 → 1 The DC link undervoltage warning threshold is defined using:
MD1604 $MD_LINK_VOLTAGE_WARN_LIMIT
.
The DC link undervoltage warning threshold should be defined to be greater than 400 V, depending
on the application case. If the DC link voltage drops below 280 V, the unit is powered-down by the
hardware.
Signal state 0 or The DC link voltage VDClink is greater than the DC link undervoltage warning threshold.
edge change
1 → 0
Application If a warning signal is given, measures can be taken by the PLC user program, for example, to stop
example(s) machining (e.g. start tool retraction) or to buffer the DC link voltage.
Corresponding to .... MD1604 $MD_LINK_VOLTAGE_WARN_LIMIT (DC link undervoltage warning threshold)
Additional references /IAD/ SINUMERIK 840D Installation and Startup Guide; Chapter: SIMODRIVE 611digital
or
/IAG/ SINUMERIK 810D Installation and Start-up Guide
DB31, ...
DBX95.7 i
2
Edge evaluation: no
Signal state 1 or The drive signals the PLC that the power unit monitoring has responded.
edge change
The rated current limit of this i
0 → 1
MD1261 $MD_I2T_NOMINAL_REDUCTION.
It is also possible to set the time for which the power unit may be at its limit in machine data:
MD1262 $MD_DIAGNOSIS_I2T
The i
overloads.
Signal state 0 or The i
edge change
1 → 0
Application Further measures can be initiated by the PLC user program, if necessary, when the warning signal
example(s) is activated.
Corresponding to .... MD1261 $MD_I2T_NOMINAL_REDUCTION (i2t limiting, rated power unit current)
MD1262 $MD_DIAGNOSIS_I2T (i
MD1263 $MD_LIMIT_I2T (i
MD1264 $MD_LOAD_I2T (i
Additional references /IAD/ SINUMERIK 840D Installation and Startup Guide; Chapter: SIMODRIVE 611D
or
/IAC/ SINUMERIK 810D Installation and Start-up Guide
Basic logic functions: NC/PLC interface signals (Z1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Signal(s) updated: cyclic
t monitoring
Signal(s) updated: cyclic
t monitoring function can be used to protect the power unit of digital drives against continuous
2
t monitoring function has not responded.
2
2.1 Various interface signals and functions (A2)
t monitoring function is defined in drive machine data
2
t time at the limit)
2
t actual limit factor)
2
t actual utilization factor)
2
Detailed Description
63