Nv8140 and nv8144 power supply alarms, External power supply alarm circuitry, Alarms – Grass Valley NV8500 Series v.3.5 User Manual
Page 126: Power supply alarms, Fig. 7-3: ps alarm connections
110
Alarms
Power Supply Alarms
Note that MRC can be configured so that when a PS8300 power supply module is removed from
the NV8300 frame, MRC will report an alarm. The alarm connector itself reports no such alarm.
(The configuration is made in MRC’s ‘Module Types’ page.)
NV8140 and NV8144 Power Supply Alarms
The power supply panel on the rear of the NV8144 and the NV8140 routers has a DE9 connector
that you can use to create a power supply alarm circuit.
Fig. 7-2: NV8144 and NV8140 Power Supply Alarms Connection
Note that MRC can be configured so that when a PS8300 power supply module is removed from
the NV8300 frame, MRC will report an alarm. The alarm connector itself reports no such alarm.
(The configuration is made in MRC’s ‘Module Types’ page.)
Do not confuse the power supply alarm connector with the system alarm connector located
elsewhere on the rear of the router. See
on page 112 for more
information.
External Power Supply Alarm Circuitry
When a power supply alarm occurs, the connection between an alarm pin and its matching
COM (common) closes. When the alarm turns off, the connection opens again.
If you want a power supply alarm indicator, create a circuit similar to one of the circuits shown in
Figure 7-3. Each pair of pins monitors an individual power supply. The NV8300 has 4 power
supplies; the NV8140 and NV8144 have two.
Fig. 7-3: PS Alarm Connections
1
2
3
4
5
6
7
8
9
1
2
3
4
PS1
PS1 COM
PS2
PS2 COM
5
6
7
8
9
n.c.
n.c.
n.c.
n.c.
n.c.
An NV8140 or NV8144 has only one or two
power supplies. Therefore pins 5–8 of the
connector are unused.
75 mW max
per alarm
Typical Circuit 1
Normally OFF, the LEDs turn ON to indicate failure
1
COM
External Voltage Source 30 VDC max
1
2
3
4
5
6
7
8
9
Typical Circuit 2
Customer-supplied relay (de-energized when alarm is ON)
1
Ext. 5V
NC
NO
Higher Power
Loads, DC or AC
1
2
3
4
PS1
PS1 COM
PS2
PS2 COM
5
6
7
8
9
PS3
PS3 COM
PS4
PS4 COM
n.c.
Internal
Ground
COM
Internal
Ground
4x • • •
For the NV8300
1
2
3
4
PS1
PS1 COM
PS2
PS2 COM
5
6
7
8
9
n.c.
n.c.
n.c.
n.c.
n.c.
For the NV8140 and NV8144