Siemens SENTRON ATC6500 - Page 78

Functions
5.2 Advanced functions
3KC ATC6500 transfer control device
76 Manual, 05/2019, L1V30538268002A-01
Designation on
the ATC6500
Description
Year
The year serves as a source for the limit threshold.
Month The current month serves as a source for the limit threshold.
Day
The current day serves as a source for the limit threshold.
Hour
The current hour serves as a source for the limit threshold.
Minute
The current minute serves as a source for the limit threshold.
Sec
The current second serves as a source for the limit threshold.
Week day
The current day of the week serves as a source for the limit threshold.
Possible reference sources
● Source 1
● Source 2
The limit thresholds can be defined in Menu P15 (see chapter P15 - User Limits LIMx
(Page 181)). In order to simplify the specification of limits that can have a very wide range,
each limit is to be set with a basic value and a multiplication factor (example: 400 x 1 = 400).
For each LIM two thresholds are available (one upper and one lower). The upper threshold
must always be set to a higher value than the lower one.
Min function
In the Min function the lower threshold defines the trip point, while the upper threshold is for
resetting. If the value of the selected measurement falls below the lower threshold, the
device is tripped after the set delay time. If the value of the measurement exceeds the upper
threshold, the device is reset after the set delay time.
Max function
In the Max function the upper threshold defines the trip point, while the lower threshold is for
resetting. If the value of the selected measurement exceeds the upper threshold, the device
is tripped after the set delay time. If the value of the measurement falls below the lower
threshold, the device is reset after the set delay time.
Min+Max function
In the Min+Max function, both the upper and lower thresholds are for tripping. If the value of
the selected measurement falls below the lower threshold or exceeds the upper threshold,
the device is tripped after the set delay time.
As soon as the measured value is within the limits again, the device is immediately reset.
Depending on the setting, tripping denotes either activation or deactivation of the LIMn limit.
If the LIMn limit is configured with a memory, the reset must take place manually, using the
dedicated command in the Commands menu.
The user limits can be viewed on the device if they have been activated (see chapter
Description of the display pages (Page 38)).
Example:
A user limit LIM1 of the voltage V L1-N of Source 1 is to be defined. The upper limit should
be 250 V AC, and the lower limit should be 220 V AC.