Applications
IDEC SmartRelay Manual
247
8.6.2
Previous solution
The lamps are switched on and off with pulse 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 al-
low 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 switchgear needs to be installed
to implement the necessary functions.
•
Due to the large number of mechanical components, high
wear and tear and maintenance expenditure is to be ex-
pected.
•
The modification of functions involves considerable ef-
fort.
B1
L1
N
E1
E1
lx>
K6
E5
K5
E4
K4
E3
K3
E2
K3
K4
K5
K6
S1
S2
S3
S4
K1
K2
K2
K2
K1
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com