Grass Valley NV7512 v.1.3 - Manual (Page 83)

NV7512 Audio Router • User’s Guide 73
2. Installation
Making Alarm Connections
Figure 2-34. NV6257 Power Supply Alarms Connection
Router Alarms
The ‘ALARM’ connection on the rear of the NV7512 uses a DE9 connector. An “alarm” or ON
condition occurs when the connection between an alarm pin and Alarm_COM (common) opens.
The alarm turns OFF when the connection between Alarm_COM and the alarm pin closes again.
To create an indicator box, connect to the ‘ALARM’ connection using a DE9 female connector,
wiring as shown in Figure 2-35. Each pin monitors a specific function and activates a specific
alarm.
COM COM
Customer-supplied
relay contacts NC
Normally OFF, the
LEDs turn on to
indicate failure
Normally ON, the
LEDs turn off to
indicate failure
External Power
30VDC max,
150mA max
GND 1 GND 14
PS1 2 PS1 COM 15
PS2 3
PS2 COM 16
PS3 4
PS3 COM 17
PS4 5 PS4 COM 18
PS5 6
PS5 COM 19
PS6 7
PS6 COM 20
PS7 8 PS7 COM 21
PS8 9
PS8 COM 22
GND 10
GND 23
GND 11 GND 24
GND 12
GND 25
GND 13
NV6257 External Power Supply Alarm, DB25, Female
Connection examples are shown below
for PS6000 power supply modules 3
and 8. Connections may be made for all
8 power supplies in the NV6257 frame.
Typical Circuit 1 Typical Circuit 2
PS3
PS8
PS3
PS8
External Ground
Caution The power supply for the alarm circuit must not exceed 30VDC. Load resistor
value depends on power supply voltage.