Chapter 11. Troubleshooting
11-
１１
Output circuit troubles and corrective actions (continued).
Condition Cause Corrective actions
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.
E
R
Sink type transistor output
Source type transistor output
Outpu
Load
Off current
Outpu
Load
E
R
Output
E1
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