ENGLISH
23
A l a r m s
The eTwin pump can monitor correct operation of the system and signal some alarm situations which can occur; to be more
specific, the following alarms can be triggered:
•
Level alarm
•
Maximum value alarm
•
Minimum value alarm
•
Overdosage alarm
All the alarm situations are associated independently to pump 1 and 2. They are signalled by displayed messages and are disabled
by active relay outputs. When several alarms are triggered, they may be viewed using the
and
keys. The alarm relay (REL5
contacts 13, 14 and 15) can also be switched, if enabled, by different configuration menus, where foreseen.
Triggering of the Overdosage Alarm always enables switchover of the REL5 alarm relay.
The following procedures show the different steps to follow to set the operating parameters of the alarm warnings of
Measurement 1 (pH), P1. The same procedure applies to Measurement 2 (Rx), P2.
Level alarms
The device allows you to connect a level sensor to each
measuring channel. To configure this input, follow the
sequence below.
The float level probe signals when the liquid to be dosed
in the tank is finished. The instrument blocks, signalling the
alarm status. Connect the level probe to the terminal board of
the instrument and introduce it in the tank containing the
additive which must be dosed. To avoid false alarms due to
oscillations of the liquid level, the alarm is triggered with at
least a 3 sec. delay. It is possible to associate a relay output
to the level alarm. See the next paragraph for its programming.
Maximum value and minimum value alarms
The device controls holding of the values of the electrochemical parameters of the water (pH, Redox, Cl) within the parameters
set when programming the device. During normal operation of the system, faults could occur and the measured values could be outside
of the normal operating condition. Two alarm thresholds can be set: respectively “MAXIMUM VALUE” and “MINIMUM VALUE”. When
these are exceeded, the operator must intervene to find out what determined their triggering and to restore correct operating conditions.
Usual causes which can generate this alarm situation can be:
•
Lack of additive in the suction tank;
•
Leaks in the treatment system;
•
Incorrect concentration of the dosed additive;
•
Sensor breakage
The maximum or minimum alarm condition disables all the relay outputs.
