P
AGE
26
I
NSTALLATION AND
C
OMMISSIONING
C
HAPTER
3
3.5
Connection of remote signals
Digital input
→ ‘IN’
terminals 16 / 17
An analysis while the water softener is in regeneration may erroneously indicate
hardness leakage. An attempt to test with the water feed closed would return either
hardness leakage or stagnant water into the feed pipes or a system error due to a
lack of flow would be signalled.
The limit analyser provides the following two methods, which may be used
alternatively, to avoid false alarms:
Method 1
Utilizing the remote input-signal feature
Connecting an external potential free contact (e.g. flow control switch or level
control switch) will allow an analysis only while the water softener is turned on and
water flows, or will suspend analysis while the water softener is in regeneration.
The purpose of remote signals is to prevent an analysis while the water softener
is regenerating or the feed water is stopped.
Method 2
Utilizing an external timer
Analysis start time and stop time may be set by an external timer. A potential free
timer-output can be connected to this remote-signal input terminal block.
Alternative
contact input
→ ‘IN’
terminals 16 / 17
If programme switch S10
is set to ‘ON’, this input serves as an analysis start
input. In addition to the programmed start intervals, an analysis can be started at
any time via this input.
NB. If switches S1 und S2
are both ‘OFF’ (5 Min. Interval), an analysis can only
be started vie this input or manually.
It is recommended to connect a remote signal wherever possible to prevent
false readings and avoid unnecessary false alarms.
Especially when there is a direct connection to a water treatment plant should
false readings be avoided.
Connect only potential free contacts to terminals 16 + 17
Function of terminals 13+14 can be checked in diagnostic menu step 13
If terminals 16 + 17 are not used, they must be bridged and S9 set to
‘OFF’
NOTE
NOTE
WARNING
