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Functions
7.9 Application-specific functions
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
247
7.9.7
Real time clock (RTC)
The real time clock is the basis for time-dependent process controls, e.g.:
●
To reduce the temperature of a heating control during the night
●
Increase the pressure of a water supply at certain times during the day
Real time clock: Format and commissioning
The real time clock starts as soon as the Control Unit power supply is switched on for the
first time. The real time clock comprises the clock time in a 24 hour format and the date in
the "day, month, year" format.
After a Control Unit power supply interruption, the real time clock continues to run for approx.
five days.
If you wish to use the real time clock, you must set the time and date once when
commissioning. If you restore the inverter factory setting, the real time clock parameters are
not reset.
Parameter
Real time clock (RTC)
p8400[0]
RTC time, hour (0 … 23)
p8400[1]
RTC time, minute (0 … 59)
p8400[2]
RTC time, second (0 … 59)
p8401[0]
RTC date , day (1 … 31)
p8401[1]
RTC date , month (1 … 12)
p8401[2]
RTC date , year (1 … 9999)
r8404
RTC weekday
1: Monday
2: Tuesday
3: Wednesday
4: Thursday
5: Friday
6: Saturday
7: Sunday
p8405
RTC activate/deactivate alarm A01098
Sets whether the real time clock issues an alarm if the time is not running in
synchronism (e.g. after a longer power supply interruption).
0: Alarm A01098 deactivated
1: Alarm A01098 activated
Summary of Contents for SINAMICS G120 CU230P-2
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