Liebert UPS System - Manual (Page 38)

Chapter 3 Electrical Assemble
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3）Connection of SNMP Card
Installation of SNMP card
Unpack the SNMP card and place it in the iron case shown in Figure 3-10
Connect the cables
On the monitoring board, there is a jack J22 with a cable to plug in directly to the
SNMP card, after the SNMP Card is installed. Please do not remove this cable
even if the SNMP card is not used.
4）Connection of RS485
Connector J23 on the monitoring board is the RS485 communication port. One
end of the communication cable is connected to J23 while the other end is
connected to the user’s equipment.
RS485+
RS485-
SHIELD
J23
1
2
3
4
Pin 1:Signal + Pin 2:Signal Pin 4:Shielded ground
Fig. 3-12 RS485 Port
3. Connection of input and output voltage free contacts
The input and output contacts can be connected to shielded cables, and single
cables. One end of the cables are connected to J9 to J18. The other end is for
connection by user.
Note:
The contact should satisfy the SELV safety requirements.
The J9-J14 connectors on the monitoring board are monitoring dry contacts of
relays. The relays have a normally open, normally closed and a common terminal.
The capacity of the contacts are 0.3A/125VAC, 0.3A/110VDC and 1A/24DC.
The transmission distance of the dry contact signals are dependent on the voltage
level and the cross sectional area of the cables. J15 – J18 are the input contacts
for external signals.