Input/Output Connections - ABB AquaMaster Explorer Instruction Manual

Electromagnetic Flowmeter
AquaMaster™ Explorer

3.4 Input/Output Connections

Caution.
Refer to the associated Data Sheets 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.
3.4.1 Frequency Outputs
Telemetry, Electronic
Counters etc.
Counter/Totalizers
Forward Flow
1 2 3 4 5 6
and/or Reverse Flow
1 2 3 4 5 6
PLC or Datalogger
Common
Input 1
Input 2
Fig. 3.8 Frequency Output Connections
Note. Outputs 1 & 2 are not polarity sensitive. The common connection for these outputs is designated
'COM'.
3.4.2 Alarm Interface
Fig. 3.9 Alarm Output Connections – AquaMaster
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.
20
*Optional link for grounding floating
output. See Caution above.
COM
O/P1
O/P2
Common
Alarm Input
I/POV*
COM
O/P1
O/P2
COM
O/P 3
3 Electrical Installation
IM/AM/E Issue 10