K-Patents PR-23 User Manual
Page 51
6 Configuration and calibration
43
4
FUNCTION LOW LIMIT
Used as alarm relay, closing contact if
source value is below set limit. (See be-
low 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 6.7.
6. If you choose either low limit or high limit as relay function, you’ll have define 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 (Fig-
ure 6.6) and entering a numeral limit value.
8. The Hysteresis value is set by choosing
5 HYSTERESIS
in the Relay menu (Figure 6.6).
The value indicates how soon the relay opens after the process has temporarily
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:
Figure 6.7
The manual set display for relays