Chapter 2 Installation 19
Liebert ITA 16kVA/20kVA User Manual
Note
The EPO action of the UPS will close the rectifier, inverter and static bypass, but it can not disconnect the UPS mains input inside.
If you want to disconnect the UPS completely, just disconnect the upstream input switch before generating the EPO,.
2.7.2 Connecting USB Communication Cable
Insert one end of the USB communication cable accessory into the USB port on the UPS rear panel (see Figure 1-2),
and insert the other end of the USB communication cable into the USB port of the computer.
2.7.3 Connecting SNMP Card Communication Cable
The UPS provides the installation communication components of the SNMP card port (see Figure1-2), including:
SNMP card, dry contact card and MODBUS card. For the installation and usage of the communication components,
refer to the delivered documentation for each communication component. SNMP card port and USB port can be used
together.
The pin distribution for each SNMP card port is shown in Figure 2-17.
1
GND_SNMP
+9_SNMP
+9_TR
SNMPSIG
14 PIN
TXD232
RXD_SNMP
TXD_SNMP
RXD232
2
3
4
6
7
8
9
10
5
Figure 2-17 Pin distribution of SNMP card ports
The pin description for each SNMP card port is shown in Table 2-4.
Table 2-4 Pin description of the SNMP card ports
Pin Description
1, 9
GND of SNMP card
2
SNMP card power supply provided by DSP panel
3
Signal from the SNMP card, which connects with RXD of the DSP
4
Signal to SNMP card, which connects with TXD of the DSP
5
Connect with RX of the RS232 communication port of the host
6
Connect with TX of the RS232 communication port of the host
7 Reserved
8
Selected communication signal, +9_TR is introduced into this pin after the SNMP card is plugged
10
The power supplied by DSP panel, for selecting the card
Note
If you wish to connect the SNMP card (model: UF-SNMP810) to Emerson temperature sensor (model: RDU-A-S01T) to make it be
the battery temperature compensation, please connect the COM1 port of the SNMP card, and set the temperature sensor DIP
address to ‘1’.
