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3.3 Input/Output Connections
Caution.
• Refer to SPECIFICATION for Input/Output ratings.
• Inductive loads must be suppressed or clamped to limit voltage swings
• Operation of outputs is programmable – see Quick Reference Programming Guide for
details.
• External isolators are not normally required as the pulse and alarm circuit is electrically
separated from all other AquaMaster connections.
• Capacitive loads must be inrush current limited.
• Fully-floating pulse outputs may be subject to static damage, e.g. connecting to a floating
datalogger, unless 'COM' is operated within its galvanic isolation range (35V) from earth.
3.3.1 Frequency Outputs – Fig. 3.15
Telemetry, Electronic
and/or
PLC or Datalogger
Note. Outputs 1 & 2 are not polarity sensitive. The common connection for these
outputs is designated 'COM'.
3.3.2 Alarm Interface – Fig. 3.16
Common
Alarm Input
Note. Output 3 is not polarity sensitive. The common connection for these outputs
is designated 'COM'. Alarm functions are available only with product software
versions: 1.1 (Release 1) 2.1 (release 2). See Programming Guide to determine
software version.
Counters etc.
Counter/Totalizers
Forward Flow
1 2 3 4 5 6
Reverse Flow
1 2 3 4 5 6
Common
Input 1
Input 2
Fig. 3.15 Frequency Output Connections
Fig. 3.16 Alarm Output Connections
3 ELECTRICAL INSTALLATION...
I/P0V*
COM
O/P1
O/P2
COM
O/P1
O/P2
COM
O/P3
17
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