C
HEETAH
64
S
ERIES
–
C
HAPTER
8
81-9059-0577-0
Rev. E
Proprietary Information of
PESA Switching Systems
8-20
8.8.3
System Control Alarm Connector
This three-pin connector, illustrated in Figure 8-12, provides an interface for an external,
customer-supplied, system control alarm (alarm contact locations are also shown).
F
IGURE
8-12
System Control Alarm Connector
The 3500 Series controller initiates a system alarm. An alarm condition is declared when the
controller is in reset and when the standby controller is gathering configuration information from
the primary controller. During an alarm condition, an optically isolated, electronically closed
circuit (see Figure 8-13 on next page) exists between contacts 3 and 1 for Controller A (top) and
contacts 2 and 1 for Controller B (bottom). This circuit acts as a switch to trigger an optional
external alarm in the event of a controller fault or failure. The controller alarm circuit supplies an
electronic contact closure, but does not provide a voltage to the external alarm.
The Customer-supplied alarm circuit voltage to this connector must not
exceed 12VDC and the associated amperage must not exceed 10mA.
The alarm is activated if any of the following 3500 Series software conditions exist:
•
Encounters an interrupt that it does not expect or can not process
•
Is unable to synchronize with the other 3500 Series controller (dual controllers)
•
Does not get the configuration from the other 3500 Series controller (dual controllers)
(+)
(-)
S
S
YSTEM
C
ONTROL
A
LARM
C
ONNECTOR
Содержание 64NE
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