Emerson Rosemount 56, Инструкция по эксплуатации

Страница: 84 / 136

Section 9: Alarm Relay Functions Instruction Manual
April 2017 LIQ-MAN-56
74 Alarm Relay Functions
9.7 Date and Time Activation
9.7.1 Description:
This relay feature allows programming of 1 to 4 relays to activate on an assigned day of the
week and time of day or night for an assigned interval. They function like sprinkler timers.
The programmable timeframe cycle is two weeks.
An example application for Date and Time Activation is daily chlorine dosing in seawater-
cooled condensers.
The Date and Time relay setup screen is shown:
9.7.2 Setup
Access Date and Time timer by pressing ENTER/MENU from the main screen and then
Program/Relays/Configure Relay. From the main relay programming screen, program this
feature as follows:
1. Relay: Assign a relay by highlighting the desired relay 1-4 and press ENTER/MENU.
2. Type: Select Date and time timer as the relay type and press ENTER/MENU.
3. Select NEXT Press ENTER/MENU to advance to the next setup screen.
4. The Week 1 calendar will appear. Program the start relay activate time by entering
day(s) of week, hour(s) of day and minutes for each hour. Enter the duration of time in
minutes (XX min) for relay activation. Up to four relays can be simultaneously
energized for any programmed times
5. Select NEXT Press ENTER/MENU to advance to the next setup screen.
6. The Week 2 calendar will appear. Repeat the programming entries for week 2 in the
same manner as week 1. Up to four relays can be simultaneously energized for any
programmed times.
Figure 9-6. Date and Time alarm operation
CAUTION
Date and Time timer operation depends on accurate setup of the internal real time clock. Continu-
ous powered operation of the 56 analyzer is recommended to preserve programmed Date and Time
timer clock settings.