Connecting Communication Cables; Connecting Dry Contact Communication Cable - Liebert ITA UPS 16kVA User Manual

18 Chapter 2 Installation
1. It is prohibited to reverse the positive pole and negative pole of the battery.
2. Before replacing the battery module and connecting the battery cables, ensure that the UPS system is in maintenance mode.
3. The length of the battery cable option is 1.5m. If you need more length cables, please consult the dealer. It is recommended that
the battery cable be shorter than 3m. Otherwise, the UPS cannot operate normally.

2.7 Connecting Communication Cables

Communication cables include: dry contact communication cable, USB communication cable and SNMP card
communication cable.
All the communication cables are the dual insulation cables which must be separated from the power cables for
wiring. When the longest connection distance ranges from 25m to 50m, the CSA should be rangeed from 0.5mm
2
1.5mm .

2.7.1 Connecting Dry Contact Communication Cable

The UPS provides five dry contact ports, see Figure 1-2 for specific positions. The silk screens of the five dry contact
ports are 1, 2, 3, 4, 5. The pin distribution for each dry contact port is shown in Figure 2-16, and the port description is
shown in Table 2-3.
Dry contact port 1 Dry contact port 2
Silk
Port name
screen
1 Output port of alarm
Output port of battery
2
status
Output port of bypass
3
status
Input port of remote
4
EPO *
Output port of bypass
5
reflected
Note*: Pin1 and pin2, or pin3 and pin4 of the dry contact port 4 reserves the corresponding terminals for configuring the EPO
function. The external EPO device also needs the shielded cable to connect to the normally open/close remote EPO switch
between the two terminals. If not necessary, you should disconnect pin3 and pin4 of the dry contact port 4, or short pin1 and pin2
of the dry contact port 4. Pin1 and pin2 of the dry contact port 4 have been shorted before delivery
Dry contact port 3
Figure 2-16 Pin distribution of dry contact ports
Table 2-3 Description of the dry contact ports
Pin NO. Pin name
1.1 S_ALARM
1.2 GND
2.1 ON_BATTERY
2.2 GND
3.1 ON_BYPASS
3.2 GND
4.1 EPO_NC
4.2 +12V
4.3 +12V
4.4 EPO_IN
5.1 BFP_O
5.2 BFP_S
5.3 BFP_C
Liebert ITA 16kVA/20kVA User Manual
Note
+12V
Dry contact port 4
Meaning
The signal level is 12V, when the system alarms
GND
The signal level is 12V, when the system runs in battery
inversion mode
GND
The level is 12V, when the system runs in bypass mode
GND
EPO activated, when opened to 4.2
EPO activated, when opened to 4.1
EPO activated, when shorted to 4.4
EPO activated, when shorted to 4.3
Bypass reflected protection relay (normally open), the bypass
SCR will close when short circuit appears
The middle point of the bypass reflected protection relay
Bypass reflected protection relay (normally open), the bypass
SCR will open when short circuit appears
2
to
Dry contact port 5