Chapter 12. TROUBLE SHOOTING
12 - 10
Output circuit troubles and corrective actions(continued)
Condition
Cause
Corrective Action
The load off response
time is long
•
Over current at Off state
[The large solenoid current fluidic load
(L/R is large) such as is directly driven
with the transistor output
•
The off response time can be delayed
by one or more second as some loads
make the current flow across the diode
at the off time of the transistor output
•
Insert a small L/R magnetic contact
and drive the load using the same
contact
Output transistor is
destroyed
Surge current of the white lamp
A surge current of 10 times or more
when turned ON.
•
To suppress the surge current make
the dark current of 1/3 to 1/5 rated
current flow