Emerson Liebert NX User Manual download pdf (Page 20)

Single Module UPS Installation

1.8 Dry Contacts

The UPS provides input dry contacts and output dry contacts.

1.8.1 Input Dry Contacts

There are several input dry contacts at the X3 slot.

Figure 3 Input dry contacts

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 1mm

cross-section area for maximum runs between 25 and 50 meters (82-164 ft), respectively.

1.8.2 Maintenance Bypass Cabinet Interface

J26 and J30 are the MBC interface.

Table 3 Input dry contacts at X3

Position

Name

Description

J4.1 ENV

Battery Room Alarm (NC)

J4.2 BtG Battery Ground Fault Detection (NC)

J4.3 GEN

1,2

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.

Table 4 Maintenance bypass cabinet interface

Position

Name

Description

J26.1 T_IT

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_OT

Output Transformer Overtemperature (NC)

J30.4 AUX_O Reserved

- Must be configured by software before becoming active

NOTE

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

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

12V

J4 J26 J30 J10

12V

GEN

BtG

ENV

GND

AUX_I

T_IT

GND

F_FAN

FUSE

DRV

12V

AUX_O

T_OT

12V 12V

12V

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 87 88

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