ABB Pulsar Edge, Product Manual

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Page 93
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Controller Peripherals
One - Wire Peripheral Devices
QS873A Voltage/Thermal Probes
The QS873A Voltage/Thermal Probes (VT - Probes) are used to measure battery temperatures for slope
thermal compensation, and to provide mid - string voltages to the ES771 for battery voltage imbalance
detection. Each of these weatherized assemblies monitor their respective contact temperature and
converts the measurements into serial data which is then read by the system controller using Maxim
’ s
industry standard 1 - Wire® bus. Several QS873A probes can be connected in a serial fashion since the
data is received through digital means. The Pulsar Edge system controller can handle up to 16
VTprobes . This allows multiple strings and or multiple batteries within a string to be monitored for
temperature. As mentioned, these probes are required for the battery string voltage imbalance feature
since they route the mid
- string voltage to the system controller via the ES771A remote mid - string
voltage monitoring modules. All probes are provided with a PTC device to protect against accidental
short circuit during voltage measurements.
Following is a brief description of the interfaces on the QS873A VT - Probe depicted above.
J2
3 - position connector connects the VT - Probe to the 1 - Wire interface through cable 848719795. It may
also connect directly to the ES771A with (CC848791517, 2.5’) or (848719829, 10’) or other VT - Probes in
daisy chain fashion using either the (848719803, 5’) or the (848719811, 10’) cable.
J1
2 - position connector serves to connect the VT - Probe to J2 on other VT - Probes in a daisy - chain fashion
described above.
Application
QS873 VT Probes can be used with or without mid - string voltage monitoring. Only one probe is
Figure 17 QS873A Voltage/Thermal Probe (VT - Probe)