The remote contacts interface is provided as a set of solid state
switching devices. The switches are available through a DB9 male
connector on the door of the UPS. The following chart shows the pin
assignment for each signal.
MAXIMUM CURRENT CARRYING CAPACITY
30 Vdc peak
30 V rms
(42 Vac peak)
Pin switches are shown in their inactive states.
Action example: If battery voltage is low, Pin 7 switch closes,
connecting pin 7 to pin 5.
Pin number 3 is not used.
UPS LAN Shutdown Signal Operation
When the UPS stop signal is sent to the UPS through pin 2 and 3 of the external contact interface, it is possible to
automatically reset the following operating systems (OS), which can automatically implement the shutdown function and
restart the operation: Windows NT, IBM OS/2 LAN server, LANtastic
Parameter 641 – UPS Shutdown by LAN Input Signal Enabled/Disabled
Parameter 642 – UPS Shutdown by LAN Signal Permitted Time Window (Adjustable)
With the UPS Shutdown by LAN Signal function enabled, when line power fails and the UPS goes to backup the LAN will
shutdown even if the UPS returns to normal mode during the shutdown process.
LAN shutdown can take several minutes. The UPS Shutdown by LAN Signal function has a companion UPS Shutdown
by LAN Signal Permitted Time Window parameter that can be set to allow sufficient time to complete the LAN shutdown
process (default: 10 minutes) even if line power is restored during LAN shutdown.
LAN shutdown is treated as a restart after battery shutdown. The restart of the LAN will be determined by the Restart After
Battery Shutdown timer.
Connect only the UPS stop signal to the external contact interface for automatic processing so that the UPS output will not
be turned off by mistake.
If the computer is started/restarted within 10 minutes after the recovery from a power failure, the power supply may
be reset while the computer is restarting.
4400 Series Installation and Operation Manual – 64527-008
OF THE SWITCH
70 mA peak
50 mA rms
(70 mA peak)
DB9 MALE CONNECTOR OUTLINE
Battery Voltage Low
Battery Discharge NO
Battery Discharge NC
Fault Signal Detect
FIGURE 10.1: COMMUNICATION INTERFACE