Grass Valley M-2100 - Manual (Page 15)

MMCP Installation/Operation Manual 1-7
Control Panel Cabling
Power Supply Alarms
A 9-pin male connector at J1 provides a power supply status reporting port.
An external device can be wired to this connector to indicate when one or
both of the power supplies fail.
A pinout diagram for J1 is given in Table 1-1 .
When both power supplies are working properly, Pin 3 (Normally Open) is
open with respect to Pin 2 (Common). If there is a power supply failure on
either AC circuit or power supply, Pin 2 and Pin 3 will close.
An external alarm may be attached to the connector to operate in one of the
following ways:
■ Connect an alarm between Pin 2 and Pin 3 to switch on when the AC
input or either power circuit fails or when either power supply fails.
■ Connect an alarm between either Pin 1 or Pin 6 and Pin 2 to open when
the AC input on either circuit fails or when either power supply fails.
■ Connect an alarm between Pin 1 and Pin 6 to open when the AC input
on either circuit fails or when either power supply fails.
Note Connecting between Pin 1 and Pin 6 is recommended only when the alarm
relay is used to switch open an inductive load such as an AC-powered relay
that cannot otherwise be protected with an external shunt diode.
The alarm relay contacts should be rated for 100 mV to 28 V AC or DC at
100 to 500 mA.
Table 1-1. Power Supply Alarm Connector Pinout
9-pin D Male Connector Pin Alarm Port (J1)
1 Normally Closed_1
2 Common
3 Normally Open
4 No Connection
5 No Connection
6 Normally Closed_2
7 No Connection
8 No Connection
9 No Connection
J1
D-9 Male
Pin
1
Pin
6
Pin
9
Pin
5