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6.7.
EM4x Main PCB Digital Input Alarm Mappings
General purpose inputs allow the Commander II & II+ system to monitor any external
equipment that includes relay or auxiliary outputs. The GPIP inputs are activated by
connecting the system positive (common) to the input terminal (configuration setup in the
EM4x can allow activation by connecting to system live).
General purpose inputs can also be configured as analogue inputs for purposes such as
battery midpoint monitoring and voltage monitoring.
These inputs may be assigned to contribute to alarm states within the monitor. The state
mapping is defined in the configuration file. Alarm mapping should be completed using the
EM4x software. Please refer to the EM4x manual for detailed information.
The inputs are normally activated by connecting system positive (usually system common) to
the input.
6.8.
Circuit Breaker Fail Monitoring
Comment: Main circuit breakers (MCBs) are monitored electronically via a diode to a digital
input on the EM4x. The digital input will trigger an alarm when it is pulled to the system
common (positive) rail. The Breaker Fail alarm will only operate if a load is connected to the
output to provide a return circuit for the sense wire. Therefore, for breakers that do not have
a load connected, the breaker can remain in an OFF position without causing a false alarm.
The battery circuit-breakers, however, use voltage sense 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 across the breaker, making electronic fail detection problematic. Hence, if
no battery is connected, the breaker must be ON to clear the Battery Breaker Fail alarm.
LVD OPERATION
7.
The primary Low Voltage Disconnect contactor is in the battery side of the DC distribution. A
secondary Load Low Voltage Disconnect can be optionally included in a section of the load
side of the DC distribution.
The LVD contactor is a bi-stable, magnetically latching contactor. This means that failure of
power or removal of the EM4x from a live system will not cause the contactor to change
state. Periodic pulsing of the LVD control signal allows the monitor to ensure the contactor
remains in the correct state. The contactor is monitored by the EM4x to allow an alarm to be
generated when the contactor is open.
The EM4x energy manager unit is powered from both the rectifier side of the LVD contactor and
direct from the battery source. Following an extended AC outage and the low output voltage
threshold being reached, the primary LVD disconnects the battery from the system live bus and
the EM4x will lose voltage sense (as voltage sense is measuring system live bus voltage) yet still
maintains operation for system monitoring. The LVD contactor will not re-engage until rectifier
input supply is restored (i.e., until the DC bus voltage is re-established). LVD
adjustments/settings are all made in the supervisory module.
Newmar • 1580 Sunflower Ave, Suite 100, Costa Mesa, CA 92626
Phone: 714-751-0488 • E-mail: techservice@Newmarpower.com
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