Electric Circuits - CKD MN4KB2 Series Instruction Manual

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OPERATION

5.4 Electric Circuits

 
CAUTION  : 
(1) With a double solenoid type valve system, energize the solenoid for at least
0.1 second even for an instantaneous valve operation. If the target valve
can be affected by a back pressure induced by another solenoid valve, it is
recommendable to energize the solenoid as long as the cylinder is making an
action.
(2) If solenoids are energized for a prolonged period of time, the surface temper-
ature of the manifold will rise. Through this increase in the temperature
should not be regarded as abnormal, provide a suitable means of ventilation
or heat release.
[SM-213928-A/2]
a)  Check  for  the  presence  of  any  current  leak  from  the 
external  control  device  because  it  may  cause  an  er-
roneous valve operation. 
When  a  programmable  controller  or  a  similar  control  de-
vice  is  used,  a  current  leak  may  prevent  the  normal  re-
turning of the valve when the solenoid is de-energized. 
b)  Restriction on current leak   
When  controlling  solenoid  valves  using  a  programmable 
controller  or  a  similar  control device,  make  sure  that  the 
current  leak  in  the  programmable  controller  output  is 
equal  to  or  less  than  the  level  shown  in  the  table  below.   
A  current  leak  larger  than  the  allowable  level  may  cause 
an erroneous valve operation. 
CR circuit
C
Contact
R
Programmable
controller 
―29―
AC100V 
Leakage
AC200V 
current
DC24V 
Solenoid valve
3.0 mA or lower 
1.5 mA or lower 
1.8 mA or lower 

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