User manual ELECTRO-VOICE DEM 313

[. . . ] When the provided plug does not fit into your outlet, consult an electrican for replacement of the absolete outlet. IMPORTANT SERVICE INSTRUCTIONS CAUTION: These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock, do not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel. 1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when servicing the appliance. [. . . ] 2 Connections of the BATTERY CONTROL pin connector Note The switch rating of the failure signal output amounts to max. The contacts 2, 3 and 13 are provided for test purposes only and must not be used. 4. Alteration of the mains voltage (to be performed by qualified personnel only) Attention: Before removing the top unit cover, the device must have been disconnected from the mains for at least 2 minutes, since the capacitors in the device carry hazardous voltage which needs to discharge first. For 115V AC operation, the mains powerfuse (6) must be replaced by a fuse 2A slo-blo (T2A). A T2A label must be stuck over the T1 A marking above the mains power fuse (6). A 115V label must be stuck over the marking 230V above the mains connector (7). The necessary labels are to be found inside the unit on the right adjacent to the PCB 85254. For alteration to 115V AC operation, the wire jumpers S501, S502 and S504 on the PCB 85254 are to be soldered in and the wire jumper S 503 must be removed, (see Figure 3). 18 F 503 S 504 S 503 S 502 Fig. 3 PCB 85254 Location of the wire jumpers S501 - S504 for altering mains voltage and position of the output fuse F503 S 501 5. Battery charging 5. 1 Charging the batteries in the battery modules DEM 316 or DEM 317 Once the charging unit has been connected to the battery module correctly, (see Section 3) and the mains voltage is present the green LEDs (3) LINE VOLTAGE, BATTERY VOLTAGE and CHARGE CURRENT light up. The charging current is indicated on the LC display (1), if switch (2) is in position A. The battery is charged with constant charging current of approx. As charging is completed, the charging current decreases rapidly with rising back-e. m. f. At the end of charging, the charging current falls to a small floating current of approx. 1 mA/Ah of the capacity of the battary to the loaded, a value which is permanently compatible for the battery. This value can vary with older batteries in particular, amounting to between 0. 5 mA and 10 mA per Ah. Note: lf the connection is faulty, there is no charging current and the green LED (3) CHARGE CURRENT does not light up. Description of function and operation The charging unit DEM 313 is designed for constant I/U battery charging in continuous battery power supply mode. Primary switched circuit technology is used to generate a regulated charging voltage or charging current which has a high efficiency rate coupled with excellent regulation characteristics and good reliability. 20 6. 1 OVERVOLTAGE protection This circuit monitors the value of the output voltage of the charging unit. lf the output voltage exceeds the pre-set upper threshold, the red LED OVERVOLTAGE lights up, the charging unit is disconnected from battery and consumers automatically, activating the error message. Thereby the battery remains connected to the consumer, supplying it until the failure has been remedied. This proection circuit prevents an inadmissible increase of the battery voltage and the resultant gassing of Ihe battery with a possible failure in the charging unit (protection against danger of explosion through detonating gas). 6. 2 LOW VOLTAGE monitoring The battery voltage is monitored in the case of discharge. [. . . ] This depends on the discharge current, the cut-off voltage and the temperature. - Service life For batteries in alarm apparatus and emergency announcement systems, the end of a battery's service life (limited duration of operation) is reached when the capacity is less than 80% of the rated capacity. - Stored energy time This is the time-span between recognition of a failure in the mains supply and remedying of this failure. - Alarm duration The alarm duration is the time-span during which the alarm signal is given out. [. . . ]