Setting functions
8.7 Application-specific functions
Inverter with CU230P-2 Control Units
294 Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
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 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.
RTC time, minute (0 … 59)
RTC time, second (0 … 59)
RTC date, year (1 … 9999)
r8404
1: Monday
2: Tuesday
3: Wednesday
4: Thursday
5: Friday
6: Saturday
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
Accept the real time clock in the alarm and fault buffer
Using the real time clock, you can track the sequence of alarms and faults over time. When
an appropriate message occurs, the real time clock is converted into the UTC time format
(Universal Time Coordinated):
Date, time ⇒ 01.01.1970, 0:00 + d (days) + m (milliseconds)
The number "d" of days and the number "m" of milliseconds is transferred into the alarm and
fault times of the alarm or fault buffer, see Section Alarms, faults and system messages
(Page 355).
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