Description Of The Relay Outputs; Diagnostic Alarm Messages - ABB AW101 Instruction Manual

Water Hardness Analyzer
AW101 Testomat

4.4 Description of the Relay Outputs

LV1 and LV2 limit value outputs
To signal that a limit value has been exceeded, two volt-free
relay contacts are available. For both contacts the limit values,
hysteresis and alarm action can be programmed independently:
Function Type
contact
LV1 Volt-free
change-over
active when in
contact
excess of limit
value 1
LV2 Volt-free
change-over
active when in
contact
excess of limit
value 2
Table 4.1 Relay Outputs
IM/AW101 Rev. C
of Action
Programmable:

Continuous contact

Impulse (1 ... 99
seconds/minutes)

Interval (1 ... 99
seconds/minutes)

Two-step regulator

Hysteresis (1, 2 or 3 limit
value in excess)
Programmable:

Continuous contact

Impulse (1 ... 99
seconds/minutes)

Interval (1 ... 99
seconds/minutes)

Hysteresis (1, 2 or 3 limit
value in excess)
4 Description of Displays and Operating Features

4.5 Diagnostic Alarm Messages

The Alarm output is a volt-free change-over relay contact.
During normal operation the contact between terminals 16/17 is
closed and the one between terminals 15/16 is open. If the
voltage fails or the alarm is activated, the contact between
terminals 15/16 is closed and the one between 16/17 is open.
The unit is equipped with a range of alarm notification functions.

Activation:
The Alarm output remains activated (with terminals 15/16
closed) as long as the fault persists.

Alarm Indicators:
Text and a red LED Alarm on the display indicate a fault.

Alarm cancellation:
The Alarm output condition is cancelled using the Horn
key.
An error message can only be deleted after the fault has
been corrected.
Exception – reagent low level, this message is confirmed
in the M-menu by entering in the new reagent level.
The following conditions activate the Alarm output and are
displayed:

Low-water pressure

Low reagent level

Function fault optics

Measuring fault – dirty chamber

Measuring fault – analysis

Measuring fault – turbid sample

Function fault – dosing pump

Measuring range exceeded

Function fault outlet to drain
Error messages are described in Table 6.1, page 14.
For a more detailed description of the programming refer to
page 11. For general maintenance refer to page 15.
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