Time Switch (Dtc) - Siemens SINAMICS G120 CU230P-2 HVAC Operating Instructions Manual

7.9.8

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:
● Day/night switching of a temperature control
● Switching a process control from weekday to weekend.
Principle of operation of the time switch (DTC)
The inverter has three independent parameterizable time switches. Using BICO technology,
the time switch output can be interconnected with every binector of your inverter, e.g. a
digital output or a technology controller's enable signal.
Figure 7-20
Parameterizing the time switch
● Enable parameterization of the DTC: p8409 = 0.
● Parameterize the activation of the weekdays; the switching on and off times.
● Enable the setting: p8409 = 1.
Additional information is provided in the parameter list of the List Manual.
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
Time behavior of the time switch using example DTC1
As long as DTC parameterization is enabled, the inverter keeps the output of all three
DTC (r84x3, x = 1, 2, 3) on LOW.
The inverter enables the DTC outputs once more.
7.9 Application-specific functions
Functions
249