Appendix BSpecifications
91
C200H-OD214 Short-Circuit Protection
The
C200H-OD214 Output Unit is equipped with two types
of short-circuit pro
-
tection.
One is overcurrent protection, and the other is thermal protection. The
short-circuit should be eliminated
immediately
in order to avoid damage to the
Unit.
Overcurrent
Protection
When the output current reaches 2 A, the alarm output
turns
ON, and the alarm LED lights. Make sure the surge current of
the load does
not exceed 2 A, or the alarm may be activated.
Thermal Protection When the junction temperature of the output transistor
reaches
its upper limit, the output turns OFF
, the alarm output turns ON, and the
alarm LED blinks. But the output transistor is provided with a heat sink. So in
some
cases, when the output is short-circuited the thermal protection may not
activate because the extra heat is dissipated by the heat sink. However, the
alarm LED will still light and the alarm output will still turn ON.
How It Works When the short-circuit protection activates, the output displays
the characteristic shown below.
Overcurrent
limit alarm
output point
Output current
2 A (minimum value)
0
Output
Voltage
Each pair of outputs share one alarm LED and one alarm output bit as shown
below (bits 12 through 15 cannot be used as work bits)
Output No. 0 1 2 3 4 5 6 7
Alarm LED No. 0 2 4 6
Alarm Output Point No. 08 09 10 11
Both
the alarm LED and
alarm output bit for the short-circuited output turn ON
even
if only one of the outputs is short-circuited. Both outputs should be discon
-
nected until the short-circuit can be traced.
Clearing
the Alarm
When the short-circuit has been eliminated, reset the Unit
by
pressing the reset button. The alarm LED will go out, the alarm
output will turn
OFF, and the output will be reset.
Reset button (use a screwdriver
or other similar object to press it).
Output LED
Alarm LED
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