Minuteman UPS Enterprise Plus Series - Manual (Page 17)

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English
COMMUNICATIONS PORTS (RS232 and USB)
The RS232 communication port is a standard DB9 female with both RS232 and
simulated contact closure capability. The UPS will poll the port and activate
the port for RS232 or contact closure in accordance with the type of cable it
finds connected to the port. To change the port configuration requires the unit
be turned off and restarted with the desired cable connected. The pinout for the
port is depicted per the chart below:
Pin 1: Simulated contact closure Low Battery Warning, NO
Pin 2: /TXD
Pin 3: /RXD and receive UPS shutdown command (connect to pin 9 for 4-
seconds. The shutdown command is only active in the battery mode)
Pin 4: Not Used
Pin 5: Ground
Pin 6: Not Used
Pin 7: Not Used
Pin 8: Simulated contact closure AC fail, NO
Pin 9: Atx Signal (high level: +12V +/-2V, low level: -15V +/- -2V)
DIPSWITCH SETTINGS
The dipswitch setting may be changed by the user to set the desired Inverter
(On-Battery) output voltage. The dipswitch must be set to the desired Inverter
(On-Battery) output voltage and then the UPS must be turned off and restarted
to reconfigure the microprocessor and save the changes. The Inverter (On-
Battery) output voltage setting can be either 120VAC (208VAC) default or 127VAC
(240VAC). Changing the Inverter (On-Battery) output voltage to 127VAC, will
also change the Buck setpoint. Changing the Inverter (On-Battery) output volt-
age to 240VAC, will also change the Brownout, Boost, Buck and Overvoltage
setpoints.
SELF TEST
The self test feature is useful to verify the correct operation of the UPS and the
condition of the batteries. With the UPS in the AC normal mode, press and
hold the On/Off/Test Button for four beeps, then release the button. The UPS
will perform a ten-second self test. During the self test, the UPS will switch to
battery power and the On-Battery LED will illuminate and the audible alarm will
sound. The length of the test that is automatically performed every two weeks
is longer than the start-up or user invoked test. This test will run for approxi-
mately fifteen-seconds to measure the battery’s capability to provide an ac-
ceptable amount of runtime. If the UPS fails a self test, one of the LEDs will
remain illuminated indicating the type of problem. NOTE: The UPS will auto-
matically perform a self test on start-up and every two weeks.
LOAD SHEDDING FUNCTION
The output receptacles are electrically wired into two segments to support the
"Load Shedding Function". The user can control the two segments individually
or both at the same time. The Load Shedding Function is controllable by the
Power Monitoring Software or the SNMP card.