User`s manual

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MELSEC-Q
1 GENERAL SPECIFICATIONS OF INPUT AND OUTPUT MODULES AND
INSTRUCTIONS FOR SELECTING THEM
POINT
(1) When using the module for the application in which the relay contact is
frequently switched, the relay life span should be considered. Therefore, it is
recommended to use a triac output module.
(2) The relay life curve shows the value based on actual use, which is not
guaranteed. Therefore, make sure to allow for a margin of error.
The relay life span differs according to the specifications as follows:
Rated switching voltage, current load 100 thousand operations
200V AC 1.5A, 240V AC 1A (COS
=0.7) 100 thousand operations
200V AC 0.4A, 240V AC 0.3A (COS
=0.7) 300 thousand operations
200V AC 1A, 240V AC 0.5A (COS
=0.35) 100 thousand operations
200V AC 0.3A, 240V AC 0.15A (COS
=0.35) 300 thousand operations
24V DC 1A, 100V DC 0.1A (L/R=7ms) 100 thousand operations
24V DC 0.3A, 100V DC 0.03A (L/R=7ms) 300 thousand operations
(3) Relay life is substantially affected by the load type and inrush current
characteristics.
The inrush current may cause the contact welding. Therefore, consideration
should be given to it as well as constant current.
(a) Inductive load
When the inductive load such as electromagnetic contactor or solenoid is
shut off, high counter-electromotive force is generated between the
contacting materials to produce an arc discharge. Consideration should be
made especially when the power factor is low, as it may decrease the life
period.
In addition, make sure to consider the contact melting, as the inrush current
equivalent to 5 to 15 times of constant current flows when the module is
powered on.
(b) Lamp load
Make sure to consider the contact melting, as the inrush current equivalent
to 10 to 15 times of constant current flows in the lamp circuit.
(c) Capacitive load
Make sure to consider the contact melting when a device such as condenser
is used in a load circuit, as the inrush current equivalent to 20 to 40 times of
constant current may flow in the circuit.
Also, pay full attention to the wire capacity if long length of wire is routed.
(7) Insulation-sleeved crimping terminals cannot be used with the terminal block.
It is recommended to cover the wire connections of the crimping terminals with
mark or insulation tubes.
(8) Use wires of 0.3 to 0.75mm
2
core and 2.8mm (0.11in.) OD max. to connect to the
terminal block. When using a wire whose core is 0.75mm or more, it is preferable to
use the spring terminal block(Q6TE-18S).
(9) Do not use I/O modules under pressure higher than the atmospheric pressure of
0m (0ft.) altitude. Doing so can cause a malfunction.
When using I/O modules under pressure, please consult your sales representative.