Liebert NX UPS System Serial Ports RS232-1 and RS232-2, External Bypass Switch Interlock

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 Web Browser, SNMP, ModBus and Relay Cards 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.

1.8.6External Bypass Switch Interlock

EXT-MaintX3-1&2on 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.

1.8.7Battery 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

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