Phenomena Causes Measures
Abnormal time
when load is a
C-R type timer
l Leakage current from surge absorbing
circuit connected to an output element in
parallel.
l Operate the C-R type
timer by mediating a
relay.
l Use other one but a C--R
type timer.
Note: A timer’s internal
circuit may have half-wave
rectification.
Load cannot
be off (DC)
l Circulating current resulting from two
different power source.
l It circulates if E1< E2.
l It circulates even when E1 is Off (E2 is
On).
l Adjusting plural to
singular power source.
l Connecting to circulating
current preventive diode.
See the following figure.
Off response
from load
takes a longer
time.
l Over current at Off
If a large current load such as solenoid,
(time constant L/R is large) is directly
operated by the transistor output.
l Since current is allowed through diode
when transistor output is off, it may be
delayed for 1s and longer depending on
load.
l Insert a magnetic
connector and others for
which time constant is
small as presented in the
figure and operate load
by the contact.
l Inrush current of glow lamp l To restrict inrush current,
it must allow dark current
that is 1/3 ~ 1/5 of the
rated current of glow
lamp.
To Next Page
Loading...
Need help?
General
