Liebert NX UPS System user manual Input Dry Contacts, X3 Ancillary Control and Alarms

Single Module UPS Installation

1.8Dry Contacts

The UPS provides input dry contacts and output dry contacts.

1.8.1Input Dry Contacts

There are several input dry contacts at the X3 slot.

Figure 3 Input dry contacts

12V 12V

12V

12V

X3

	J4
12V	GEN	BtG	ENV

	J26
GND	12V	AUX I	T IT

	J30
AUX O	T OT	F FAN	FUSE

J10

OL GND FB DRV

X3 Ancillary Control and Alarms

X3 IN DRY: Environmental, Battery Ground Fault and Generator Contacts

The UPS accepts external signalling from voltage-free (dry) contacts connected to finger-proof, push-in ter- minal X3 IN DRY. Subject to prior software programming, the signalling is accepted by the UPS when connection between the relevant terminal and the +12V terminal is altered. Cables connected to X3 IN DRY must be segregated from power circuits (for screening purposes), double insulated and of a typical 0.5 to 1mm2 cross-section area for maximum runs between 25 and 50 meters (82-164 ft), respectively.

Table 3	Input dry contacts at X3
Position		Name	Description
J4.1		ENV3	Battery Room Alarm (NC)
J4.2		BtG	Battery Ground Fault Detection (NC)
J4.3		GEN1,2	On Generator (NO)
J4.4		+12V	+12V Power

1 - Must be configured by configuration software before becoming active.

2 - When activated, the charger current can be limited, via software, to a percentage of the full charger current (0-100%). 3 - Activating this feature turns the battery charger off.

1.8.2Maintenance Bypass Cabinet Interface

J26 and J30 are the MBC interface.

Table 4 Maintenance bypass cabinet interface

Position	Name	Description
J26.1	T_IT1	Input transformer overtemperature (NC)
J26.2	AUX_I	Reserved
J26.3	+12V	+12V Power
J26.4	GND	Power Ground
J30.1	FUSE	Reserved
J30.2	F_FAN	Fan Fail Alarm (NC)
J30.3	T_OT1	Output Transformer Overtemperature (NC)
J30.4	AUX_O	Reserved

1- Must be configured by software before becoming active

NOTE

All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm2

(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.

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