American Power Conversion MX28B2400 Sys HV Alm, Sys HV Thr, Sys LT Alm, Sys LT Thr, Sys LV Alm

PARAMETER NAME/	DESCRIPTION	DISPLAY SCREENS /
[MENU LOCATION]		DEFAULT SETTINGS
System High Voltage alarm	The output relay energized if the System Voltage	Sys HV Alm	m+
Security Level {1}	is above the System High Voltage threshold.	Minor
[SYSTEM/SET-ALM]
System High Voltage	System Voltage is bus voltage measured by the	Sys HV Thr	m+
Threshold	controller. An alarm will be reported if voltage is	-58.00 V
Security Level {1}	higher than the voltage entered.
[SYSTEM/SET-ALM]
System Low Temperature	The output relay energized if the System	Sys LT Alm	m+
Alarm	Temperature is below the System Low	Minor
Security Level {1}	Temperature threshold.
[SYSTEM/SET-ALM]
System Low Temperature	System Temperature is ambient temperature	Sys LT Thr	m+
Threshold	measured inside the controller. An alarm will be	0.0 C
Security Level {1}	reported if temperature is lower than the
[SYSTEM/SET-ALM]	temperature entered.
System Low Voltage Alarm	The output relay energized if the System Voltage	Sys LV Alm	m+
Security Level {1}	is below the System Low Voltage threshold.	Minor
[SYSTEM/SET-ALM]
System Low Voltage Threshold	System Voltage is bus voltage measured by the	Sys LV Thr	m+
Security Level {1}	controller. An alarm will be reported if voltage is	-50.00 V
[SYSTEM/SET-ALM]	lower than the voltage entered.
System Temperature	System temperature measured within the control	Sys Temp	+
{Status Only}	unit.	26.7 C
[STATUS]
System Voltage	System output voltage measured between the	Sys Voltage	+
{Status Only}	MX28B DC power plant -48V and return buses.	-54.00 V
[STATUS]
Test Major Relay	Setting this parameter to “ON” de-energizes the	Test Maj Rly	m+
Security Level {1}	Major Relay and turns on the “MAJ” LED on the	OFF
[SYSTEM/DIAG]	control unit front panel. In normal operation Major
	Relay is energized so that when a loss of –48
	VDC power occurs, the relay will change state.
Test Minor Relay	Setting this parameter to “ON” energizes the Minor	Test Min Rly	m+
Security Level {1}	Relay and turns on the “MIN” LED on the control	OFF
[SYSTEM/DIAG]	unit front panel.
Test Relay 1	Setting this parameter to “ON” energizes Relay 1	Test Relay 1	m+
Security Level {1}	and turns on the “ALM1” LED on the control unit	OFF
[SYSTEM/DIAG]	front panel.	•
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Test Relay 6	Setting this parameter to “ON” energizes Relay 6	Test Relay 6	m+
Security Level {1}	and turns on the “ALM6” LED on the control unit	OFF
[SYSTEM/DIAG]	front panel.
Test Relay Enable	This parameter must be set to “Enable” to permit	Test Relay En m+
Security Level {1}	the eight output relays to be manually tested;	Disable
[SYSTEM/DIAG]	otherwise, the state of the relays will be per
	system conditions.

MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 44