Siemens HydroRanger 200, Instruction Manual

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7ML19985FC03 HydroRanger 200 – INSTRUCTION MANUAL Page 69
mmm
mm
E
x
te
rnal T
o
ta
lizers and
Flow S
a
mplers – 6 Relay
External Totalizers and Flow Samplers
[6 relay model]
This feature is only available on the HydroRanger 200 6 relay model.
External totalizers are simple counters which count the number of relay clicks produced
by the HydroRanger 200. This is generally used to keep track of OCM or pumped volume
totals. Note that both of these values are also stored in the HydroRanger 200 and are
available through communications.
Flow samplers are devices which take a sample of liquid when triggered by a relay click.
These samples are used to monitor water quality over time. Flow samplers can be driven
by OCM volume or by relay click volume settings depending on the application
requirements.
Relay Contacts
Pumped volume is calculated at the end of the pump cycle. Totalized volume given
through a relay set up for totalizer (P111[r]=40) will be given in bursts at this time.
Both the open and closed times for the relay contact are provided by P645 and are preset
to 0.2 seconds. Partial units are added to the next pump cycle.
Example:
Shows a relay set up to make one contact for every cubic metre (m
3
) of liquid.
Totalizer
To set the totalizer to provide relay contact to an external counter, use the following:
Counter Formula
1 Contact per 10
P640
units
P640 is preset to
0
so the default number of
contacts for a pumped volume cycle is
equivalent to the number of volume units.
P645
P645
4m
3
2m
3
2m
3
3m
3
1m
3
Pump Cycle