Table of Contents
Advertisement
Fig. 4
Alarm Mapping to Volts-free Relays
The SM36 has three voltage-free alarm relay outputs as standard
Note that on all systems, Relay 1 is pre-configured as the "Monitor Fail" alarm. This alarm
activates if the monitor has a hardware fault or if software becomes corrupted.
All other relays can be mapped to different alarm conditions. The SM36 Manual details how
these may be changed. On the standard Centurion II Systems alarms are preconfigured as
follows:
Relay 2: Summary Non-urgent alarm
Relay 3: Summary Urgent alarm
Relay 4, 5, & 6: User configurable
As mentioned, if these mappings are not appropriate, they can be changed in the field to suit
customer requirements.
General Purpose Digital Inputs (GPIP) for external alarm contacts.
Circuit Breaker Fail Monitoring
Load circuit breakers are monitored electronically via a diode to a digital input on the SM36. The
digital input will trigger an alarm when it is pulled to the system Common (positive) rail. This
means that to operate, the load must be connected. In this way, false alarms are avoided when
no load is connected and the load circuit breaker is in the "off" position.
This means that a residual voltage will be measured at the load terminal even when the
Note:
circuit breaker is turned off. This is high impedance and does not present a hazard to
the user, this is normal.
The battery circuit breakers however, use auxiliary contacts to detect tripping or whether they
are turned off. This is because when a battery breaker is tripped, there may be very little voltage
difference, making electronic fail detection problematic. Hence, if only one battery is connected,
both breakers must be "on" to clear the Battery Breaker Fail alarm.
5 LVD O
PERATION
This system is configured with one Low Voltage Disconnect contactor, in the battery side of the
circuit as shown below & in the Wiring Schematic at rear of this manual.
The SM36 Supervisory Monitor unit is powered from both the rectifier side of the battery LVD
contactor and battery source. Therefore when the low voltage threshold of Battery LVD is
reached, the LVD disconnects the battery and the SM36 will lose voltage sense (as voltage
• Phone: 714-751-0488 • E-mail: techservice@newmarpower.com
Newmar • PO Box 1306, Newport Beach, CA 92663
10
Advertisement
Table of Contents
