RFL Communications 21 Sub-MUX Bedienungsanleitung PDF herunterladen (Seite 19)

RFL SMX3 / 21 Page 19 of 22 Issue 1.4

User Manual

08 June 2009

12. Power Input

Power input is 48 Vdc nominal. (24V – 72V range).

SMX3/21 can be connected to positive earth, negative earth or floating supplies.

The power connections P1 and P2 are not polarity sensitive, but when using a

grounded supply, the 0V leg must be connected to P2. (See table)

A 500mA fuse (5 x 20mm) is in the rail connected to the P1 terminal.

A separate earth connection is required to the M4 Earth stud provided.

Power Input Connections

Type of supply Terminal P1 Terminal P2 Earth stud

Positive Earth – 48Vdc 0V Main Earth

Negative Earth +48Vdc 0V Main Earth

Floating Either Either Main Earth

13. Alarms

Two alarm relays are incorporated, energised when healthy. Each relay provides a

single changeover contact presented on a plug-in terminal strip, see equipment

layout. For a contact that closes on alarm, use common and NC connections.

• Power alarm:

Energised when healthy

Alarm state is when applied voltage falls below nominal minimum voltage.

• Aggregate communications alarm:

Alarm state is when any of the following conditions are present on either the

X.21 or Concatenation ports (only when enabled):

Aggregate port configuration error

No clock present

Aggregate frame not synchronised

Yellow alarm (remote alarm)

Alarm Connections

Function Terminal Contact Notes

A NC Closed in alarm state

B Common

Aggregate

Comms Alarm

C NO Closed when healthy

D NC Closed in alarm state

E Common

Power Alarm

F NO Closed when healthy

1 2 ... 14 15 16 17 18 19 20 21 22

Keine Kommentare

RFL Communications 21 Sub-MUX Bedienungsanleitung Seite 19