Detailed Description
2.1 Various interface signals and functions (A2)
NC/PLC Interface Signals (Z1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-63
DB31, ...
DBX95.0
VDC link < warning threshold
Edge evaluation: no Signal(s) updated: cyclic
Signal state 1 or
edge change
0 → 1
The drive signals the PLC that the DC link voltage VDC link has dropped below the DC link
undervoltage warning threshold.
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
edge change
1 → 0
The DC link voltage VDClink is greater than the DC link undervoltage warning threshold.
Application
example(s)
If a warning signal is given, measures can be taken by the PLC user program, for example, to stop
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
t monitoring
Edge evaluation: no Signal(s) updated: cyclic
Signal state 1 or
edge change
0 → 1
The drive signals the PLC that the power unit monitoring has responded.
The rated current limit of this i
2
t monitoring function is defined in drive machine data
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
2
t monitoring function can be used to protect the power unit of digital drives against continuous
overloads.
Signal state 0 or
edge change
1 → 0
The i
2
t monitoring function has not responded.
Application
example(s)
Further measures can be initiated by the PLC user program, if necessary, when the warning signal
is activated.
Corresponding to .... MD1261 $MD_I2T_NOMINAL_REDUCTION (i
2
t limiting, rated power unit current)
MD1262 $MD_DIAGNOSIS_I2T (i
2
t time at the limit)
MD1263 $MD_LIMIT_I2T (i
2
t actual limit factor)
MD1264 $MD_LOAD_I2T (i
2
t actual utilization factor)
Additional references /IAD/ SINUMERIK 840D Installation and Startup Guide; Chapter: SIMODRIVE 611digital
or
/IAG/ SINUMERIK 810D Installation and Start-up Guide
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