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Elementy systemu domofonowego
2500
3.6. Checking of voltages at test points.
Voltages measured between the test points should be as follows:
K1 K3 14-16 V
K2 K3 approx. by 100 mV less than K1-K3
K4 K5 0V
L+ L- 7...9 V, during talk approx. 4.5...6.5 V
The above values refer to the system operating under normal conditions (the system
operative, with connected keypad). The voltages are specified with 20% tolerance.
It is recommended to check voltages at test points in each new installation.
3.7. Error and fault messages.;
Possible errors and defects occuring during the system operation are indicated by
the following messages in the display:
E
When one of the inferared beams forming the keypad system is defective, the
door phone program will mask this error and the system will operate correctly.
Depending on a set operation mode (during programming) this condition can be
indicated by single E at the display left side.
Err
. If more than one inferared beams are defective, Err will be displayed and the
keypad will not accept commands. Depending on a set operation mode the system
is switched over to emergency program and the street-door catch is unlocked
periodically (once every 45 seconds). The emergency mode is also called in the
case of defect of cables connecting the electronic cassette to the control panel.
E-2
on the display indicates short-circuit of the uniphone line, as described above.
It may also indicate defective uniphone, removed from the uniphone cradle. In the
case of this message, check installation for short-circuits. If the error message was
caused by a defective uniphone, find and replace it. Under the rest conditions (no
uniphone selected) current in the uniphone line sholud be lower than 1 mA measured
at the door phone output). During talk this current hould be 30-60 mA. If the current
is greater than 100 mA (irrespective of the line state, i.e. irrespective of whether in
the course of talk or not) the line is shortücircuited. It should be noticed that after
detection of this error the uniphone line is switched on and off periodically to reduce
the power consumption. The line current will therefore change from a shortücircuit
value (above 100 mA) to zero, in 2-3s cycle.
E-0
after the power supply has been switched on - defect of the microprocessor
memory working space. This error is unlikely to occur. In this case the electronic
cassette should be replaced with a new one.
EEr
this error can occur during operation on the working storage in which the lock
codes and the door phone parameters are stored. This message indicates the
memory write/read error. Operation during which the error occured should be
repeated. Sometimes it is sufficient to reswitch the power supply.
