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Document: LT0273 MX4428 MXP Engineering / Technical Manual
Device Information and Programming
Issue 1.5 24 March 2006 Page 3-45
3.22 SNM800 SOUNDER NOTIFICATION MODULE
3.22.1 GENERAL
The SNM800 Sounder Notification Module is suitable for relay outputs which require
supervision of the load wiring and optional supervision of the DC power supply (if any).
When inactive, a reverse polarity supervision voltage is applied to the load wiring. The load
devices must therefore have internal or external reverse blocking diodes.
The load supervision can detect short and open circuit states on the load wiring only when
the relay is inactive.
The 24V DC supply may be supervised.
The load must be isolated from ground and all voltage sources. All inductive loads (e.g. bells
or relays) must have back-emf diodes or other noise clamping devices fitted.
Recognition of a fault condition takes about 30 seconds.
3.22.2 SNM800 SPECIFICATIONS
Dimensions Height: 61mm Width: 84mm Depth: 25mm
Weight 100g
Line Connections L-, L+
Supply Voltage 20V – 40V
Supply Current Standby Current : 450uA (typical)
LED On : 3.0mA (typical)
Output Circuit EOL 27k ohms, 0.5 watt
Contact Rating 2A 30Vdc
Load must be isolated from ground and all supplies.