External Bypass Switch Interlock; Battery Start Facility; Figure 6 Battery Start For Ups - Emerson Liebert NX User Manual

Single Module UPS Installation
Serial Ports RS232-1 and RS232-2
RS232-1 provides serial data and is intended for direct use with Liebert MultiLink monitoring and
server shutdown software.
RS232-2 provides serial data and is intended for use by authorized commissioning and service person-
nel.
These serial ports are shared with the optional Web browser, SNMP, ModBus and relay cards. Refer
to Table 28 regarding compatibility of simultaneous use.
Intellislot Card Interface
There are three interface slots available for optional Web browser, SNMP, ModBus and Relay cards
as illustrated in 8.0 - Options—For Assembly Inside the UPS Cabinet.
1.8.6

External Bypass Switch Interlock

EXT-Maint X3-1&2 on UPS Parallel Board M3 (leave open if no external bypass switch is used)
Provides external maintenance bypass interlock protection for the UPS. Short circuit means external
bypass closed.
EXT-Out (X3-3&4) on UPS Parallel Board (leave shorted if no external output switch is used). Pro-
vides external output interlock protection for paralleled UPS modules. Short circuit means external
output switch closed.
NOTE
UPS Parallel Board M3 is located behind protective covers accessible after opening the UPS
front door – removal of this barrier requires the use of a tool and is restricted to service
personnel.
NOTE
Jumper JP1 (located next to X3) needs to be removed for X3:3&4 to work properly.
1.8.7

Battery Start Facility

1. Rotate the switch to Normal Mode.
2. Verify that the batteries are connected.
3. Press Battery Start Button.
The LCD begins to show startup screens. The rectifier indicator flashes green while the rectifier is
starting up. It stops flashing and becomes solid green about 30 seconds after the rectifier enters
the normal operation state.
4. After UPS has initialized, press Inverter On
Figure 6 Battery start for UPS
Battery Start Button
15