Exhaustive Discharge Protection - Dynacord PRO MATRIX SYSTEM DEM 314 Owner's Manual

Table II shows the maximum current which can be obtained from the battery. This must not be
exceeded. This gives the maximum number of power amplifiers which can be supplied by the
batteries.
Battery Imax
type in A
DEM 314 50
Table II Maximum current and number of power amplifiers
* The number of power amplifiers which can be directly connected to the battery drawers can be lower
than the values specified in Table II (see number of outputs, Section 7, Specifications). The values
specified in the Table only refer to the connection of one amplifier type to one battery type. As long as
the maximum current extracted does not exceed the value stated, however, various types of amplifier
can be supplied by one type of battery.

2.2 Exhaustive discharge protection

The battery drawer is equipped with an exhaustive discharge protective circuit which is controlled by
the battery monitoring unit in the charging device. In case of underflow of the cut-off voltage of
1.75 V/cell * 12 cells = 21 V, measured at the battery poles, the consumer is disconnected from the
battery and the charging unit. In this way the battery is safely protected against exhaustive discharge.
If the exhaustive discharge protective circuit is activated, the red LED „low voltage" lights up and the
fault is indicated by the collective failure signal. The battery is automatically switched on again once
the fault has been remedied, and the LED „low voltage" goes out.
Note: The exhaustive discharge protection only operates in conjunction with the battery modules
DEM315,DEM316 and DEM317.
2.3 Changing the Mains Voltage (only to be performed by qualified personnel)
After beeing switched over appropriately, the battery and charging module DEM 314 can also be
operated on 115V AC mains voltage. Switching over to accommodate the said voltage is performed as
follows:
— separate mains connection, control socket and all consumers from the device
— remove lid
— the mains transformer TR 1 - DCN 358 420 is on the left-hand side of the charging unit. To
switch over to 115V AC, remove the wire jumper between solder lug 4 and 8 and solder two
new wire jumpers between solder lug 2 and 4 and 8 and 10 (see fig.)
DEM 287 DEM 288 DEM 289 DPA4410 DPA4411 DPA4120 DPA4140
8 4
230V~
max.number of power amplifier*
2
2
19
5
2
115V~
3