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Evaluation of individual
alarm conditions
Alarm signals present in the escape door
control unit can be displayed in different
ways by the LED status display at the door
terminal. If e.g. the green LED continues
to flash (ratio approx. 1/1) after an alarm
has been reset, this means that an alarm
condition is still present.
Sabotagecontact
Emergency-Opening
door terminal
Locked-check-back
External fire alarm system
Central Emergency-Opening
(720-22) or via jumper j3
Not applicable to 720-20
Detector loop
Central release
Escape door control unit 720-20(22)
Technical data
Power pack:
Mains connection
230 V AC -10%/+15% 50/60 Hz
Power input
Approx. 54 VA, depending on load
Separate voltage or emergency power
supply
24 V DC, 1.25 A
Nominal operating voltages:
24 V DC (adjustable from 24.2 to 25.9 V)
12 V DC for detector loop
Loading on 24 V side
max. 1.25 A (at 24.5 V DC).
By operating the key (turn to left/right) and
briefly holding the key position, it is
possible to determine the individual alarm
conditions as shown in the table below and
thus to rectify the causes effectively and
quickly.
Terminal
Left
LED
green yellow red green yellow
red
2
12
15
17
23/24
45/46
If no display is given, this alarm
38
Power pack assembly:
Transformer with separate windings
– Configuration to DIN VDE 0551, part 100
– Insulation and electrical isolation to DIN
VDE 0804
– Insulation category T40/E
– 100% duty cycle
Switched mode power supply unit with 24 V
switching voltage regulator and linear
storage reactance coil. Generates loop
voltage for fire detectors via 12 V linear
controller.
Adjustment of operating voltage:
Po1 - 24.2 to 25.9 V DC
Key-switch
Right
condition is present
29
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