The Power supply unit is a DC/DC converter regulated type, designed with surge protection and to provide transient surge isolation between the station battery and the sensitive electronic components of the annunciator system. Fuse protection is also provided to protect from overload or short circuit on the power supply output. There are three rating : 60 watts, 120 watts and 240 watts to suit for the annunciator system (16, 32, 64 and more alarm point).
Input voltage is 48, 110, 125 or 220 VDC (Specified when order) but output voltage shall be 24 VDC only.
The ESPAN-01 series annunciator system is simple for installation by using detachable connector concept which managed most of the wiring. Besides, it is convenience for maintenance. Only the malfunction module of the three separate- modular module can be repaired or changed.
The operation sequence of the annunciator is as following; when the fault signal is occurred in each input, an alarm output signal is sent toward bell/horn or buzzer which can be pre-selected as heavy fault (Bell/Horn) or light fault (Buzzer). At the same time, it will send flicker output to the set style indication lamp that corresponds to each I/O channel. After pressing an acknowledged push button switch, if an alarm-contact is returned, then the alarm is canceled. However, the indication window is steady on unless the reset push button switch is activated. Then the lamp will be turn off and ready for the next operation.
The lamp test push button switch is also provided for the purpose of checking lamp at normal condition and while checking the lamp, if a fault occurs, the operating alarm sequence will operate as usual with no effect from the lamp test sequence anymore.
Function test of ESPAN-01 Annunciator : if the lamp test push button switch is pressed more than 3 seconds, all the display window lamps would flash with audible sound alarm. (Bell/Horn or Buzzer)