Alpha Technologies SD08 - Manual (Page 10)

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 2 of 11
2 Features, Alarms and Controls
The following chapter will cover the various features and options available on the SD08 Battery Fail Monitor.
2.1 Module Indicators
Two indicators are provided on the SD08 module to provide visual indication of its operational status (see Figure
1). The conditions and associated colors are:
• Module Power On (OK) ............................................Green
• Battery Condition Fail (FAIL) ....................................Red
The OK LED indicator illuminates when the SD08 module is getting power from the battery and the battery status
is OK.
The FAIL LED indicator illuminates when the battery is in a fail condition and will latch (see Reset Button).
The green LED will turn off.
2.2 Fail Alarm
The SD08 Battery Fail Monitor module is equipped with a fail alarm, which is extended to the alarm module
(Argus system controller or customer’s monitoring system) via the contacts on a Form C relay. The alarm may
indicate one of the following conditions:
• If the battery cell is open,
• If there is a bad connection,
• If the cell is performing inefficiently,
• If the battery cell is shorted
• No power (neither LED illuminated).
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. See Figure 3.
The alarm contacts are also ‘fail-safe’ and therefore will present an alarm condition without a source of voltage
being present, however, the Fail LED will not remain illuminated unless there is input power available. The alarm
will be extended if the input voltage to the unit falls below factory set limits or if the internal reference fails. If the
unit returns to normal operation (and the battery status is OK) then the alarm will clear.
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 closed (NC) and normally open (NO) contacts are available.
NOTE: The Fail Alarm relay is de-energized during alarm conditions.
NC will provide the user with open contacts when the power is on (and there are no alarm conditions) and closed
contacts when the power is off or when an alarm condition is present. NO will act in a similar manner and give
closed contacts under power-on and non-alarm conditions; open contacts under power-off or alarm conditions.
2.3 Reset Button
The local alarm indication (red LED) is latching. You must press the SD08 module front panel push button to
reset.
2.4 Mid-Point Alarm Setting Control
A front panel rotary switch (see Figure 1) with 16 indents allows the user to set the maximum allowable voltage
deviation in battery string halves to 1.6 Volts in 0.1 Volt increments; i.e. 0.1, 0.2… 1.6V.