APC PM4 user manual $51,1

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Operation and Features

SPD’s do not require alot of operator intervention after installation.

NOTE: The PM Series has a green LED for each phase which extinguishes when the module is no longer providing protection (fault condition).

All of the PM series of SPDs contain a diagnostic circuit which monitors the suppressors status continuously and automatically. If a fault condition were to occur, the built-in front panel audible alarm will sound and a red "Service" LED will light, indicating that the unit is in need of service by a qualified technician.

The audible alarm can be silenced by pressing the "Mute Alarm" button on the touchpad, until a qualified electrician or service person is available to service the unit. The red "Service" LED will continue to be illuminated even though the audible alarm has been silenced. This will continue until the fault condition has been cleared.

Each of the internal surge protection modules have a green LED that lights to signify that the module is on-line and functioning properly (the N-G module does not have an LED). In addition to module LED’s, the front panel also dis- plays the status of each internal module by use of diagnostically controlled green LED’s. This technique ensures that a false indication does not occur if an LED were to burn out. A true/hard fault condition can be confirmed by having an audible alarm with the red "Service" LED lit, as well any module LED and front panel status LED extinguished. By utilizing all of these built in diagnostic features, an operator can more easily determine if a hard fault exists or if a status LED is faulty. If power is applied to the SPD and one or more of the module LED’s are extinguished and any diagnostic LED on the front panel concurs with any module LED, then the faulted module may need to be replaced. Use the troubleshooting section of this manual to locate and repair the fault.

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