Rack
3.1 Rack UR6021 (6DD1682-0CH3)
SIMATIC TDC hardware
44
System Manual, 08/2017, A5E01114865-AL
3.1.7
Voltage monitoring
Input voltage
The input voltage is monitored for low level.
Input voltage
Reaction
Undervoltage < approx. 85 V
ACFAIL signal and CPU STOP, shutdown of
output voltages <85 V
Voltage dips ≤ 20
ms are buffered.
The power supply unit and therefore the system are restarted automatically on recovery from
a voltage dip below the permissible mains voltage.
The power on/off sequence (e.g. generation of a RESET or SYSFAIL signal) corresponds to
the reaction to manual operation of the mains switch.
Output voltage
All output voltages are monitored (e.g. for overload/short-circuit).
Voltage monitoring functions at the power supply
outlet
Reaction
+5 V in the range from 4.75 V to 5.35 V
“POWER OK” LED is lit green;
+ 3.3 V in the range from +3.18 V to +3.5 V
+ 12 V in the range from +11 V to +13 V
- 12 V in the range from -11 V to -13 V
In all other cases, the “POWER OK” LED is lit red.
System failure alarm
Select the "Object properties" in the "STOP" tab of HW Config to configure the response of
the relevant module to a system failure alarm (bus signal *SYSFAIL=low):
●
The other modules also change to STOP
●
The other modules remain in RUN
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