R.V.R. Elettronica PJ300M, User Manual

PJ300M

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User Manual

Rev. 7.0 - 25/07/03

PJ300M are:

•

V 

≅

 50 V

•

I 

≅

 8 ÷ 9,5 A

It is possible to verify the precision of the built-in wattmeter using an external
measurement instrument like a through wattmeter. An accuracy of 10% should be
considered normal.

To check the functionality of the “alarms reset” button, push it while the amplifier is
transmitting.

ATTENTION: While the button is pushed, the power output of the amplifier is cut.

With the button pushed, verify that “FWD”, “V” and “I” are all reduced to 0. If the
connection of the interlock has been done correctly, the exciter power is also cut
while the button is pressed.
Releasing the button, all the parameters will return to their former value.

To test the amplifier protection system, you can increase the drive level until the red
LED “overdrive” lights up. The protection system is triggered by this condition, and
the amplifier is disabled for about 10 seconds. The exciter is also disabled via the
interlock connector. After the delay introduced by the protection system, the amplifier
and the exciter will be enabled again.

The device doesn’t require any human supervision for its normal operation. If any
alarm condition arise, these are automatically managed by the embedded protection
system; if the protection system doesn’t succed in re-establishing the normal
conditions, it will be nessary to remove the causes of the malfunctioning and to manually
reset the system (using the button “alarms reset”, or via the telemetry connector).

5.3

Protection System

Basically, the protection system of the amplifier forces it in standby mode in case a
situation that is considered “dangerous” for the machine takes place.

After approx 10 seconds, the amplifier will be reenabled. If in the meantime the blocking
condition has not been removed, the amplifier will be disabled again. After four
attempts the device will be disabilited for approx 90 seconds.

After this longer interval is expired, the amplifier starts a new cycle of disabling/
reenabling, analogous to the previous one. If at the end of this cycle the fault condition
is still present, the amplifier will be definitely disabled. As already said, at this point it
will be necessary to manually reset the amplifier using the button “alarms reset”, or
via the telemetry connector.

If, during the cycles of the protection, the amplifier works regularly for at least 90
seconds, the counters of the protection system are reset.