IDEC SmartRelay FL1D Series - Advantages of Using IDEC Smartrelay

Applications
273
IDEC SmartRelay Manual
8.3.2 Advantages of using IDEC SmartRelay
The IDEC SmartRelay solution requires less switchgear.
That saves you installation time and space in the control cab
-
inet. You might even be able to use a smaller switching cab-
inet.
Additional IDEC SmartRelay options
• The free output (Q4) can be used as isolated signal con-
tact for reporting faults or power failure.
• It is possible to switch off of the fans by means of a se-
quential circuit.
These functions can be implemented without additional
switchgear.
Block diagram of the extended IDEC SmartRelay solution
The fans at Q1 and Q2 are switched on and off by means of
the following circuit:
x
T=
10 s
T=
30 s
Q1
Q2
I2
Q3
x
x
I3
I2
T=
10 s
T=
10 s
x
x
x
I3
I4
Q3
I1
Q2
On
Fault
Off
Exhaust air
flow sensor
Q1 exhaust fan
Exhaust air
flow sensor
Fresh-air fan
Fresh-air flow
sensor
Off
Exhaust
fan
Fresh-air
fan
Error
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com