Input/Output Connections; Frequency Outputs - ABB AquaMaster Instruction Manual

Electronic Commercial Water Meter
AquaMaster™

3.3 Input/Output Connections

Caution.
Refer to Specification – see Section 5, page 39 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

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
Fig. 3.16 Frequency Output Connections
Note. Outputs 1 & 2 are not polarity sensitive. The common connection for these outputs is designated
'COM'.
24
I/P0V*
COM
O/P1
O/P2
*Optional link for grounding floating
output. See Caution above.
COM
O/P1
O/P2
3 Electrical Installation
IM/AM Issue 13