6 Conguraon and calibraon
45
Figure 6.6 Relay menu for Relay 1
3 FUNCTION INSTRUMENT OK Closed contact if there is no equipment mal-
function. See also Section 8.4 on page 75.
4 FUNCTION LOW LIMIT Used as alarm relay, closing contact if source
value is below set limit. (See below for limit
source selection.)
5 FUNCTION HIGH LIMIT Used as alarm relay, closing contact if source
value is above set limit. (See below limit source
selection.)
6 FUNCTION PRECONDITION See Figure 6.14.
7 FUNCTION WASH See Section 6.5.
6. If you choose either low limit or high limit as relay function, you’ll have deine a
limit source. For this, select 3 LIMIT SOURCE in the Relay menu (Figure 6.6).
Limit source selection:
1 NOT DEFINED Factory setting.
2 CONCENTRATION Measured concentration CONC
3 PROCESS TEMPERATURE Process temperature
7. The Limit value is set separately by choosing 4 LIMIT VALUE in the Relay menu
(Figure 6.6) and entering a numeral limit value.
8. The Hysteresis value is set by choosing 5 HYSTERESIS in the Relay menu (Fig-
ure 6.6). The value indicates how soon the relay opens after the process has tem-
porarily gone over the high limit or under the low limit. For example if the high
limit is 50 and the hysteresis is 2, the relay will not reopen until the process drops
below 48.
9. To change the relay delay time, choose 6 DELAY in the Relay menu (Figure 6.6).
The delay is given in seconds, factory setting is 10 s.
For manual set, go (back) to the Select relay menu and choose 3 MANUAL SET. In the
manual set display you can open and close the any relay by pressing the appropriate
soft key. The current status of the relay (open or closed) is displayed next to the relay
name, see Figure 6.7 below:
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