AccuLoad IV Installation & Maintenance Manual
Meter I/O Connections
50
4.3 Meter Input Wiring
The AccuLoad totals volume or mass in response to pulses received at the pulse input terminals of the
A4M, A4B, or A4I modules. The pulse input connections to use for each meter is dependent on the
configuration of the AccuLoad. For product meters, the AccuLoad automatically assigns the pulse inputs
based on the products defined in the configuration database. The number of pulse inputs required for each
meter varies based on the type of meter specified in the configuration database, as follows:
Because the pulse input circuitry of the AccuLoad requires the input pulse OFF voltage to be less than 1
volt (and the ON voltage to be more than 5 volts), it is important that the Line Monitoring function on the
Promass 84 be disabled when connecting the Promass 84 to the AccuLoad. If the Line Monitoring
function on the Promass 84 is enabled, the OFF voltage of the pulses will be more than 1 volt and thus
will not be counted by the AccuLoad. Three jumpers on each frequency output submodule on the I/O
board enable and disable the Line Monitoring function. The factory default is to enable line monitoring.
See
the Proline Promass 84 Operating Instructions (
) to enable and disable this functionality.
Table 29: Promass 83 and 84 Coriolis Meter Dual-Channel Connections
AccuLoad Connections
Promass 83 and 84 Connections
Pulse Input A Plus
+24 VDC
Pulse Input A Minus
Promass Terminal 24 (Signal A output) for Promass output options
Model 83: M
Model 84: M and 1
AccuLoad DC Ground
Promass Terminal 25 (Signal A negative) for Promass output options
Model 83: M
Model 84: M and 1
Pulse Input B Plus
+24 VDC
Pulse Input B Minus
Promass Terminal 22 (Signal B Output) for Promass output options
Model 83: M
Model 84: M and 1
DC Ground
Promass Terminal 23 (Signal A Negative) for Promass output options
Model 83: M
Model 84: M and 1
The Promass output option is defined by the last character of the Promass model code.
Table 30: Meter Pulse Input Connections
Meter Type
Required Pulse Inputs
Single-channel
One pulse input per meter
Dual-channel
Two pulse inputs per meter
Dual-channel with integrity
Four pulse inputs per meter
Summary of Contents for Smith Meter AccuLoad IV
Page 7: ...AccuLoad IV Installation Maintenance Manual Introduction 2 Figure 1 AccuLoad IV ST ...
Page 9: ...AccuLoad IV Installation Maintenance Manual Introduction 4 Figure 3 AccuLoad IV QT ...
Page 11: ...AccuLoad IV Installation Maintenance Manual Introduction 6 Figure 5 AccuLoad IV N4 ...
Page 14: ...AccuLoad IV Installation Maintenance Manual Introduction 9 Figure 8 AccuLoad IV SA FCM ...
