Alpha Technologies SD08 - Manual (Page 17)

Argus Technologies Ltd. 018-546-C0 Rev C WC
Printed in Canada. © 1999 Argus Technologies Ltd. ARGUS is a registered trademark of Argus Technologies Ltd. All Rights Reserved. Page 9 of 11
7 Operation
Normal operation of the battery fail monitor system will be indicated by the illumination of the BATTERY
CONDITION OK LED indicators on each module and the absence of illumination of the FAIL LED indicators on
each module.
An open cell, shorted cell or poor performing cell will cause the midpoint voltage deviation to shift exceeding the
Midpoint Alarm Setting (V). This will result in a battery midpoint alarm (BATTERY FAIL).
NOTE: Some fine-tuning may be required to obtain the ideal setting that is sensitive enough to detect a ‘bad’ cell and will
not produce false alarms.
The Midpoint Alarm Setting (V) will have to be adjusted within the functional range and is dependant upon many
factors including the battery characteristics under float, charge and discharge conditions.
7.1 Factory Defaults
7.1.1 Midpoint Alarm Setting (V)
The Midpoint Alarm Setting (V) has a programmable range of 0.1 to 1.6V (in 0.1V increments).
The default setting for 24Vdc systems is 0.5V.
The default setting for 48Vdc systems is 0.5V.
7.1.2 Fail Alarm Contacts
The SD08 module has a terminal block (plug in cable connector) for the Form C relay alarm contacts located on
the rear of the module PCB; both normally open and normally closed contacts are available. The Fail Alarm
contacts will change state when the voltage difference between the two halves monitored exceeds the
programmed value set by the front panel control. The relay is jumper selectable for latching or no latching
operation.
The default setting is for no latching operation.