42 en TroubleshootingPLENA matrix
Problem | Possible cause | Possible solution | |
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Amplifier: Fault light lit for | – This is indicating | – | The amplifier |
approx. one second. | protection on that |
| automatically retries the |
| channel (overload or |
| channel after this time (1 |
| short condition). |
| min). |
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| – Note that the amplifier | |
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| will not detect a short- |
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| circuit directly without |
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| signal - for instance, if a |
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| short is on the output, |
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| but no signal is being |
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| driven, the amplifier may |
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| not actually be in fault |
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| mode. As soon as |
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| enough signal is present |
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| to activate the current |
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| protection the fault LED |
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| will light. |
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Amplifier: Fault LED flashes | – This indicates a thermal | – The channel will be | |
quickly for around 30 | error on the channel. |
| re‑activated after it has |
seconds. |
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| cooled down. |
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Amplifier: Fault LEDs flash | – This indicates that the | – | Send immediately for |
slowly. | PSU has failed (or |
| service and/or contact |
| thermally cut‑out). |
| the Bosch authorized |
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| dealer or installer for |
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| assistance. |
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Call stations / Wall Control | – RS485 ID cannot be | – Check that the switches | |
Panel's LED keep rotating. | identified. |
| have been full switched |
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| to the appropriate |
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| positions, and reset |
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| power to the unit. |
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| – Check that the CAT‑5 | |
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| cable is not damaged in |
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| anyway. |
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| – | Download and connect |
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| with the latest version of |
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| PC GUI and check the |
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| RS485 status "Device > |
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| RS486 device status". |
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Operation manual | Bosch Security Systems B.V. |
