Section D.3 Valve Type “B” Lockout Procedure

The type “B” valve has a manual regulator in parallel with the automatic section that prevents the pressure it is controlling from going below a minimum. To lock this valve out:

1)Set the pressure setpoint for the air system to 0 psi. At this point the manual regulator will try to fill the system while the automatic section tries to dump.

2)Use the LOX valve (integrated into this type of valve) to dump the system and lock out the manual section.

Note!

Step 1 MUST be done even if a LOX valve is opened in step 2 since the

 

control may try to pressurize the system using the Fill/Dump valve if the

 

power is on!

Section D.4 Valve Type “C” Lockout Procedure

When power is removed from the control or if the air system is turned OFF in the configuration menu, a type “C” valve will revert to the manual section and the pressure will be no lower than the regulator but may be higher because of the check valve.

To lock out a type “C” valve:

1)The air setpoint for the system to be locked out should be set to 0 psi OR the system must be turned OFF in the configuration menu.

2)Use the LOX valve (integrated into this type of valve) to dump the system even if the pressure setpoint is set to 0 psi at the control. This is necessary because if the control is powered down intentionally or unintentionally the valve will revert to the manual regulator setting and may attempt to fill the air system again.

Note!

Step 1 MUST be done even if a LOX valve is opened in step 2 since the

 

control may try to pressurize the system using the Fill/Dump valve if the

 

power is on!

If the LOX valve is opened when the system is still turned on and the pressure setpoint is not 0 psi, the system will think it has a leak and will attempt to fill so it is important to turn the system OFF in the configuration menu or set the pressure setpoint to 0 psi before the LOX valve is opened.

April 17, 2000 Man ual Versio n 1.0

D.2

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SMC Networks 5000 manual Section D.3 Valve Type B Lockout Procedure, Section D.4 Valve Type C Lockout Procedure

5000 specifications

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