Paradise 205486 REV F manual Alarms J4, Summary Alarm J4 Form C Contacts

3.4 Alarms (J4)

A variety of alarm signals are present at the M&C connector, J4. Both Form-C relays and open collector outputs are available. An amplifier summary alarm is available in both Form C relay and open collector output. Detailed internal faults are available in open collector form and include: voltage, current, and over-temperature.

3.4.1 Summary Alarm (J4) Form C Contacts

The Summary Alarm is accessible in both Form C relay and open collector format. The form C relay is “energized” under normal operating conditions and “deenergized” when a fault condition exists.

3.4.2 Auxiliary Alarm (J4) Form C Contacts

The Auxiliary Alarm relay is an end user alarm that can be used to signal an alarm condition that is dependent on the state of the Auxiliary Input (J4-Pin P).

The Auxiliary Input is a contact closure to ground. When this input is pulled to ground the Auxiliary Alarm relay is energized (Normal State). When the Auxiliary Input is open circuited the Auxiliary Alarm relay is de-energized (Alarm State).

One example usage of the Auxiliary Alarm is that it could be used to signal one of the detail alarms (voltage, current, or temperature) by connecting the appropriate open collector alarm output to the Auxiliary Input. This programs the Auxiliary Alarm relay to be either a voltage, current, or temperatue Form C relay alarm.

3.4.3 Open Collector Alarm Outputs (J4)

The open collector alarm outputs will require external pull-up resistors (unless connected to the Auxiliary Input). They are capable of sinking up to 20mA current at 30 VDC. The open collector outputs are pulled to ground under normal operating conditions and switch to high impedance state during an alarm condition.

Auxiliary Alarm: follows state of Auxiliary Input as described above

Voltage Alarm: high when amplifier’s internal regulator voltage falls below its acceptable level

Current Alarm: high when the amplifier’s operating current falls below its acceptable level

Temperature Alarm: high when the amplifier’s baseplate temperature rises above its acceptable threshold of 90°C. A 5°C hysteresis window exists in the temperature alarm.

Spare Alarm: high when the phase locked local oscillator’s lock alarm is triggered

Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 27