Siemens SINAMICS G120P, Operating Instructions Manual

Page: 399 / 496

Functions
7.7 Application-specific functions
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
399
Example:
Saved as alarm time in the alarm buffer:
r2123[0] = 2345 [ms]
r2145[0] = 15920 [days]
Number of seconds = 2345 / 1000 + 15920 × 86400 = 1375488023
Converting this number of seconds in RTC provides the date: 03.08.2013, 02:00:23.
7.7.11 Time switch (DTC)
The "time switch" (DTC) function, along with the real-time clock in the inverter, offers the
option of controlling when signals are switched on and off.
Examples:
● Switching temperature control from day to night mode.
● Switching a process control from weekday to weekend.
Principle of operation of the time switch (DTC)
The inverter has three independently adjustable time switches. The time switch output can
be interconnected with every binector input of your inverter, e.g. with a digital output or a
technology controller's enable signal.
Figure 7-26 Time behavior of the time switch using example DTC1
Setting the time switch
● Enable parameterization of the DTC: p8409 = 0.
As long as DTC parameterization is enabled, the inverter keeps the output of all three
DTC (r84x3, x = 1, 2, 3) at LOW.
● Set the activation of the weekdays; the switching on and off times.
● Enable the setting: p8409 = 1.
The inverter enables the DTC output once more.
Additional information is provided in the parameter list of the List Manual.