The lamps are switched on and off with current impulse
relays, by means of pushbutton control at the door.
Regardless of this, they are reset with a timer or daylight
control switch signal at the central off input. The pulse width
of the off commands must be reduced by means of interval
time-delay relays to allow operation of the lights after they
are switched off.
Components required:
• Pushbuttons S1 to S4
• Daylight control switch B1
•Timer E1
• Interval time-delay relays K1 and K2
• Pulse switches K3 to K6 with central OFF function
Disadvantages of the previous solution
• A substantial amount of switch
gear need
s to be installed
to implement the necessary functions.
• Due to the large number of mechanical components, high
wear an
d tear and maintenance expenditure is to be
expected.
• The modification of functions involves considerable
ef
fort.
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