User Manual

Applications

290 IDEC SmartRelay Manual

8.6.2 Previous solution

lx>

K5 K6

S1 S2

S3 S4

K1 K2

K2K2K1

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 needs to be installed

to implement the necessary functions.

• Due to the large number of mechanical components, high

wea

r and tear and maintenance expenditure is to be

expected.

• The modification of functions involves considerable

fort.