Input / Output Connections; Frequency Outputs - ABB AquaMaster 3 User Manual

AquaMaster 3
Electromagnetic flowmeter

3.3 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 Programming Guide (COI/FET2XX–EN) for details.

External isolators are not normally required as the pulse and alarm circuit is electrically-separated
from all other AquaMaster 3 connections.

Capacitive loads must be inrush current limited.

Fully-floating pulse outputs may be subject to static damage, for example connecting to a floating
datalogger, unless 'COM' is operated within its galvanic isolation range (±35 V) from earth.

3.3.1 Frequency Outputs

Fig. 3.6 Frequency Output Connections
Note. Outputs 1 and 2 are not polarity-sensitive. The common connection for these outputs is
designated 'COM'.
20
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
OV*
COM
O/P1
O/P2
*Optional link for grounding floating
output – see Caution above.
COM
O/P1
O/P2
3 Electrical Installation
User Guide OI/FET2XX–EN Rev. E