Eaton SC300 Operation Handbook

Contents

SC300 Handbook70 Copyright © 2007-2018 Eaton Corporation. All Rights Reserved.IPN 997-00012-03 B2 Issue B2 July 2018Battery Mid-point Monitoring (MPM) and Quarter-point monitoring (QPM) The SC300 uses the same settings for MPM and QPM. Where text refers to MPM or Mid-point monitoring below, it includes quarter-point monitoringunless otherwise stated.Battery Mid-point monitoring and Quarter-point monitoring provide cost-effective methods for theearly detection of internal battery faults.The voltages of the two halves or quarters of a battery string are measured and the systemcontroller 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. Furtherinvestigation can then isolate the faulty cell(s) and action can be taken to correct the problem andprevent a total battery failure.To connect Battery Mid-point Monitoring see details in the dc power system Installation andOperation Guide. If a String Fail alarm is generated see Troubleshooting on page 122.To ensure reliable operation MPM / QPM operate only when the battery is in float charge andafter a configurable lockout period since the last battery discharge, Fast Charge, Equalize or BatteryTest. Quarter-point monitoring requires the one of these IO Boards : IOBGP-10/11/20/21. The IOBGP-00/01 only supports mid-point monitoring.► To enable Battery Mid-point Monitoring (MPM) or Quarter-Point Monitoring (QPM) If any of the mid-point monitoring analog inputs are used for Reverse Battery Detection (seedetails on page 77) then they are not available for MPM/QPM.1 Connect the mid-point monitoring sense wires to the batteries. Refer to the dc power systemInstallation and Operation Guide. There are four mid-point / quarter-point monitoring analog inputs on an IOBGP Input / Outputboard. Up to 20 additional battery strings can be monitored if additional IOBGP Input / Outputboards are connected. Refer to the dc power system Installation and Operation Guide for detailson how to connect additional IOBGP Input / Output boards to the SC300.2 In DCTools/Web go to Batteries.3 Set Cells Per String to the number of 2V cells per string (for example: 24 for 48V nominalsystem).4 Expand the Mid-point Monitoring table.5 Set MPM Enable to Enabled and check the configuration settings (see details on page 72).6 Go to Analog Inputs and Enable the mid-point / quarter-point monitoring analog inputs asrequired. For Mid-point monitoring, battery strings 1-4 will be connected to IOB Number 1, IOB AINumbers 2-5. Battery strings 5-8 will be connected to IOB Number 2, IOB AI Numbers 2-5. Andso on, as required up to string 24. For quarter-point monitoring, each string requires a Battery First Quarter Point, a BatteryMidpoint, and a Battery Third Quarter Point input to be connected. Each IO Board can measurequarter-points for one string, plus one spare input. For instance, four strings requires 12 analoginputs, which can be achieved with three IO Boards.7 Go to Alarms > Alarm States. Enable and configure the String Fail alarm. See System AlarmConfiguration on page 57.► To clear a String Fail alarm1 On the web, go to Batteries > Mid-point Battery Monitoring (expand the table).