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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 (±35 V) from earth.
Recommended protection for floating output systems is to wire 'COM' to '0V'.
3.3.1 Frequency Outputs – Fig. 3.16
Telemetry, Electronic
Counters etc.
Counter/Totalizers
Forward Flow
1 2 3 4 5 6
Reverse Flow
and/or
1 2 3 4 5 6
PLC or Datalogger
Common
Input 1
Input 2
Note. Outputs 1 & 2 are not polarity sensitive. The common
connection for these outputs is designated 'COM'.
3.3.2 Alarm Interface – Fig. 3.17
Common
Alarm Input
*Optional link for grounding floating output.
See Caution above.
Note. Output 3 is not polarity sensitive.
The common connection for these outputs is designated 'COM'.
Alarm functions are available only with product software
≥ 1.1 (Release 1) ≥ 2.1 (release 2). See
versions:
Programming Guide to determine software version.
*Optional link for grounding floating
output. See Caution above.
COM
O/P1
O/P2
Fig. 3.16 Frequency Output Connections
I/P0V*
COM
O/P3
Fig. 3.17 Alarm Output Connections
3 ELECTRICAL INSTALLATION...
I/P0V*
COM
O/P1
O/P2
17
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