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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Liebert NX UPS System Input Dry Contacts, X3 Ancillary Control and Alarms, Maintenance Bypass Cabinet Interface