Mitsubishi Electric QX10 User Manual page 16

1 GENERAL SPECIFICATIONS OF INPUT AND OUTPUT MODULES AND
INSTRUCTIONS FOR SELECTING THEM
1 - 5
(b) QY81P
Function
Common
(Overload and overheat
protective functions)
Overload protective
function
Overheat protective
function
(11)Input modules may import noise or the like as an input depending on the pulse
width of a signal.
This pulse width has a value as listed below depending on the parameter-set
response time. The operating environment should be fully considered when making
the response time setting.
Response Time Setting (ms)
1
5
10
20
70
• If an overcurrent keeps flowing due to overload, heat is generated
to activate the overheat protective function.
• Each protective function is designed to protect the internal
elements of the module, not the external equipment.
• The overload protective function is activated in 1 point increments
in terms of 1A to 3A/point.
• The overload protective function returns operation to normal when
the load becomes a rated load.
• The overheat protective function is activated in 2 point increments.
(It is activated in 2 point increments of Y0/Y1, Y2/Y3, ..., and when
overheat protection is activated, that of 2 points is activated
simultaneously. If an overheat condition persists, heat transferred
may activate the other overheat protective function.)
• If an output turns ON at the activation of the overheat protective
function, the actual output voltage oscillates between 0V and load
voltage.
At the load voltage of 24V, the average voltage during oscillation is
approx. 7V.
No oscillation is encountered when the output is OFF at the
activation of the overheat protective function.
To ensure that the output is turned OFF at the activation of the
overheat protective function, use an external load which switches
OFF at 7V or more.
• The overheat protective function automatically returns operation to
normal when heat reduces.
Minimum Value of Pulse Width
That May Be Imported (ms)
MELSEC-Q
Description
0.3
3
6
12
45
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