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Other Features
External communications
Refer to the system controller handbook for information on these communications options.
Communications options
Communication with DCTools via USB
Communication with DCTools or PowerManagerII via RS232
Communication with DCTools or PowerManagerII via
an external PSTN or GSM modem (dial-in and dial-out on alarm)
Communication with DCTools or PowerManagerII via Ethernet
Communication with web browser software via an IP network
Communication with a Network Management System (NMS) using
SNMP
Communication with a Building Management System (BMS) using
Modbus
Alarm and status messages to GSM Short Messaging Service (SMS)
text capable cell phones
Communication with an alarm management system using
voltage-free relay contacts (on an IOBGP I/O board)
Low Voltage Disconnect Option
An optional Low Voltage Disconnect (LVD) is available for the Access Power Solutions
(APS3-330 Series). See the diagram on page
disconnect.
For information on operation see Low Voltage Disconnect (LVD) in the System Controller
Operation Handbook.
Battery Mid-point / Quarter-point Monitoring Description
Battery Mid-point / Quarter-point Monitoring provides a cost-effective method for the early
detection of internal battery faults. The voltages of the two halves of a battery string are
measured and the system controller generates an alarm signal if a voltage imbalance is detected.
A voltage imbalance is an indication that one or more cells has an internal fault. Further
investigation can then isolate the faulty cell(s) and action can be taken to correct the problem and
prevent a total battery failure.
To connect Battery Mid-point Monitoring see details on page 28. If a String Fail alarm is
generated see Troubleshooting on page 50.
To ensure reliable operation Mid-point Monitoring operates only when the battery is in float
charge and after a configurable lockout period since the last battery discharge, Fast Charge,
Equalize or Battery Test.
Copyright © 2007-2018 Eaton Corporation. All Rights Reserved.
IPN 997-00012-07A1
3
for location. This is connected as a battery
July 2018
General Description
9
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