Dynacord DEM 313 Volt-/Amperemeter, Temperature tracking, Fuses, Nominal capacity, Capacity

6.8 Volt-/Amperemeter

A 3-digit LC display (1) with toggle switch (2) is provided for measurement of the battery voltage or the charging current. With the switch V/A at the front panel in position V, the battery vollage is shown. Likewise the charging current is shown with the switch in position A.

6.9 Temperature tracking

The charging voltage requires battery-adapted temperature tracking in conjunction with operation under ambient temperatures between +5°C .. +40°C. The temperature is to be measured in direct proximity to the battery. The temperature tracking feature consists of a temperature sensor, integrated in the battery module DEM 316 or DEM 317 which must be installed in direct proximity to the battery, and a control circuit in the charging unit. The sensor is connected to the charging unit via the 15-pole pin connector BATTERY CONTROL. The control circuitis activated if the temperature sensor has been connected correctly. lf the connection of the temperature sensor is faulty of there is a short-circuit or a break of the sensor lines or of the sensor, this interupts battery charging and the collective failure signal is activated.

The retrofitting kit NRS 90200 is to be used for the battery module DEM 315 or other batteries and is available as Article no. 121 950.

7. Fuses

The dimensions of all the fuses in the unit are 5 x 20 mm and must correspond with IEC 127.

Fuse holder (4)	mains power fuse for mains connector (see page 2)	T4A 250V
Fuse holder (6)	mains power fuse for 230V ac (see page 2)	T1A 250V
Fuse holder (6)	mains power fuse for 11 5V ac (see page 2)	T2A 250V
PCB 85254, F503	output fuse CHARGE OUTPUT (see Figure 3)	T4A 250V

8. Glossary:

- Continuous battery power supply (standby operation)

In this mode, the battery is constantly kept at full charge. It only gives off current if the DC source supplied by the mains fails.

- Nominal capacity:

The nominal capacity is the value in ampere-hours for a 20-hour even, uninterrupted discharge with up to the cutoff voltage of 1.75 V/cell at a temperature of 22°C.

- Capacity:

The capacity of a battery is the amount of electricity which can be extracted under the condlitions in question. 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.

- Emergency announcement duration

This is the time during which announcements are made to clear the building or section of a building.

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