4
Application 1: Energy rates
.
Task:
Real energy consumption shall be counted in different rates according to the respective daytime. The rate times
have to be programmed for winter and summer time separately. The place of installation is IRAN.
The following times have been fixed:
Summer time:
Winter time:
Tariff 1 (T1)
from 00:00 - 10.00 h
Tariff 1 (T1) from 00:00 - 12.00 h
Tariff 2 (T2)
from 10:00 - 24.00 h
Tariff 2 (T2) from 12:00 - 24.00 h
Energy meter T0 is the addition of T1+T2.
Strategy:
1. Fixing of the time zone offset
2. Programming of the weekly switching clock for the corresponding tariff times
3. Programming of the time zone comparator
4. Programming of the logical combinations
5. Fixing of the I/O configuration
Step 1:
The time base of UMG507 is based on UTC. The standard time in Iran is GMT+3,5h for winter time and GMT+4,5h for
summer time. This corresponds to a time zone offset of 12600sec in winter and 16200sec in summer.
The summer/winter time changeover in Iran is as follows:
Winter/summer time changeover = First day in Farvardin
Summer/winter time changeover = End of 30th day in Shahrivar
This means, a calculation from the Persian calendar to the Gregorian calendar must be carried out.
The changeover according to the Gregorian calendar would be:
Winter/summer changeover = Third Monday in March at 23:59h (20:29 UTC)
Summer/winter changeover = Third Wednesday in September 23:59h (20:29 UTC)
Those data can be programmed via PSW.
