Liebert UPS System user manual Connection of input and output voltage free contacts, 12 RS485 Port

Chapter 3 Electrical Assemble

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

Pin 1:Signal + Pin 2:Signal

J23

1

2

3

4

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.

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