Sices HS 315, Техническое руководство

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54 Technical Handbook
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Supplied by the plant battery.
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Supplied by the auxiliary source.
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Absorbed by the loads.
Please connect the transducer in a way that satisfies that rule.
The current measurements are performed as True RMS.
At least, the DC current of the plant battery must be connected to the controller (if not, the
controller activates the warning W273).
The HS315 is provided as standard for use with the SHUNT sensors. If it is required to use it
with HALL effect sensors, it must be indicated before the order. The controller must then be
suitably configured using parameter P.9600:
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0: SHUNT sensors.
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1: HALL effect sensors.
HS315 uses Hall effect sensors to perform the DC current measurements; the sensors must
be connected to connectors JU1, JU2, JU3 e JU4 of the controller. The connecting cables are
provided by SICES.
HS315 can measure voltages up to +/- 1.053 Vdc on JUx connectors: ensure to use relevant
sensors
DC currents are measured via external shunt resistors, which can be connected to the JU
connector on the controller. The controller's inputs are galvanically isolated from its power
supply.
Shunt up to 200mVdc of signal can be used.
Ensure that appropriate shunts are selected: since the HS315 device can carry overcurrent
protection, the value of the shunt must be mediated between the ability to measure the
overload current value you need and the required accuracy of measurement.
The use of shunts larger than the rated current of the system will allow you to measure higher
over currents but reducing the measuring resolution.
The HS315 shunt inputs have a measurement accuracy <0.1% compared to the 200mV
Measuring Scale Fund: this results in a maximum error of 0.2mV.
The accuracy of the DC current measurement, however, also depends on the shunt precision
class used.
For example, considering a 250A / 100mV shunt with a precision class of 0.5, the
measurement error introduced by the HS315 controller will be up to 0.5A while the
measurement error introduced by the shunt will be a maximum of 1.25A.
It is therefore advisable to use shunt with a precision class of at least 0.5 or better (cl.0.2 or
0.1) if you want to take advantage of the excellent measurement accuracy that the HS315 can
guarantee.
Pay attention to the cable polarity to avoid reading the current value with polarity opposite to
the actual one. To check the orientation, you can start the generator, power up the load and
the system battery, ensuring that all readings have the correct polarity.
Use of a shielded cable is recommended for connecting the measurement from the shunt.
Terminal Shunt input
JU-1 Shunt IDC1 Positive input