Technical data

Chapter 4: Installation
SP40S Multi-Function Facility Communication System Manual, Revision L
3
Table 4-1 Terminal Block Connection Definitions
Terminal
Block
Symbol
Alarm Connections
Definitions
TB1
Terminal
Block 1
Section 1
Alarm Connections
ALM
Alarm connections
Alarm Form C relay changes state in Audio Alarm Conditions.
These conditions are: Push-to-talk Button on MIC depressed.
AUX initiated via CC or NAC, and IN1- IN8 inputs present.
Contacts are rated at 24VDC, 2A. Resistive load.
NO
Normally open
Alarm Relay contact open to Common (COM) in non-alarm
condition.
NC
Normally closed
Alarm Relay contact closed to Common (COM) in non-alarm
condition.
COM
Common
Alarm Relay Common (COM).
TB2
Terminal
Block 2
Section 2
System Trouble Connections
TRB
System Trouble connections
Trouble Form C relay changes state in Trouble Conditions.
Contacts are rated at 24VDC, 2A. Resistive load.
NO
Normally open
Trouble Relay contact open to Common (COM) when a system
trouble is NOT present.
NC
Normally closed
Trouble Relay contact closed to Common (COM) when a system
trouble is NOT present.
COM
Common
Trouble Relay Common (COM).
TB3
Terminal
Block 3
Section 3
AC Trouble Connections
AC TRB
AC Trouble connections
AC Trouble Form C relay changes state when primary power is
missing or low. Contacts are rated at 24VDC, 2A. Resistive load.
NO
Normally open
AC Trouble Relay contact open to common (COM) when primary
power is sufficient.
NC
Normally closed
AC Trouble Relay contact closed to common (COM) when
primary power is sufficient.
COM
Common
AC Trouble common (COM).