DRAKE EH24 User Manual download pdf (Page 70)

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Superior Broadcast

ATVCA Amplifier User Manual

Superior Broadcast ATVCA Amplier

8.2 Working Logic

8.2.1 Protection System

The protection system implemented inside the amplier is based on one type of

intervention.

The Shut Down type of reaction consists in turning OFF the equipment’s amplifying

section when a specic variable exceeds a set value.

Depending on the type of event occurred, and after the amplier has been turned

OFF, it will be reactivated after a set length of time or only after the sharing,

which caused the locking, has been cleared. In the alarm menu the rst type of

conguration is indicated by X - (Y), whereas the second one is indicated by Wait.

The third possibility is that the system does not trigger the protection conforming

to a specic parameter: this is indicated by Dis. (Disabled).

While the amplier is OFF temporarily owing to an alarm, the yellow WAIT LED

lights up and the reason the protection was triggered is shown on the display.

When the protection system trips due to a “cyclic” type parameter, a counter

begins counting up (the X value in the alarm menu). If the counter reaches the max

admissible cycle value (Y), the amplier turns OFF denitely and the red “FAULT”

LED lights up on the front panel.

The user may press the ALARMS RESET key to interact with the protection system.

The effect differs depending on the machine’s status when the key is pressed:

• If the equipment is off, waiting for the cycle time to be reached, or if it is

denitively off in FAULT state, press the ALARMS RESET button to immediately

turn the amplier ON and reset the alarm counters.

• SIf the system is transmitting but alarms were triggered earlier causing certain

counters not to be at “0”, pressing the key will have no effect unless it is pressed

while inside the alarm menu. As such, the system will be sure that the user

takes note of the alarms that were triggered before resetting them.

The system resets the alarm counters automatically after thirty minutes of operation,

i.e. the user need not do anything, if the amplier does not trigger any alarms or

after the machine the machine has been turned OFF and then back ON.

8.2.2 Alarms and Faults

There are four types of alarms that can cause a machine lock-out and trigger a

“WAIT” indication , then an appropriate yellow LED turns on. When any one of

the three alarm thresholds is exceeding, the system will automatically switch

to the warning screen (even if user is browsing another system menu) and

the following messages are displayed:

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User Manual

Rev. 1.0 - 22/11/10

ATVCA

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DRAKE EH24 User Manual Page 70

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