3-4
MAT FULL RACK/ 022300
command causes noncatastrophic error messages to be stacked in memory until interrogated
by a Status command.
3.3
AUTOMATIC (TRACKING) CONTROL OF THE CROWBAR LEVEL
MAT Power Modules have Overvoltage and Overcurrent Tracking Amplifiers. These amplifiers
will cause a crowbar flag, send a catastrophic error to the Power Module Controller and shut the
module down if the output goes out of tolerance. Autotracking range is from 10%± 3% of nomi-
nal value above the programmed MAT Power Module output voltage or current.
3.4
POWER MODULE CONTROLLER/MAT TIME DELAYS (TO OBTAIN A VALID STATUS):
After sending a command that might affect the output of the Power Modules or their relays, it is
recommended that the Status command be sent. For information on this command see the
applicable Power Module Controller Manual. The required time delay before a valid status of the
Power Module Controller/MAT system is as follows:
•
After an Open, Close, Change of Polarity, or Change of Mode wait approximately 300
milliseconds.
•
After a Confidence Test command or an Internal Self Test wait approximately 400 milli-
seconds.
•
After a Reset command wait approximately 300 milliseconds
•
After an INX Command the maximum delay time is 2 seconds
3.5
POWER LOSS CIRCUIT
An Automatic Shutdown option is available when a Power Loss is detected. Dependent on the
setting of jumper J5 on the A2 Sense and Polarity Relay Board, the Power Module will shutdown
automatically or remain in operation (see Figure 3-2). If the jumper is in place the AC Input
Power circuit breaker will trip; if the jumper is removed the circuit breaker will not trip. The MAT
Power Module is supplied with the jumper installed. To access the PCB, remove the cover (see
Section 5).
