Nor-Cal N-Series Op Lit - Manual (Page 9)

9 Call toll free 800-824-4166 or 530-842-4457 • FAX 530-842-9130
N-Series Isolation Poppet Valves
BLACK -Ground
GREEN - Closed
WHITE - Open
RED - +24 VDC
5.5 Position indicator Electrical Connection
6.0 Troubleshooting
Please refer to the following possible symptoms and root causes to troubleshoot your N-Series valve. Alternatively, you can contact Nor-Cal technical support at
800-824-4166. In many cases, the N-Series valve problem can be diagnosed and fixed in the field. Spare parts and kits can be found in Section 7 of this manual.
Should it be necessary to return a valve to Nor-Cal Products for service, then please refer to Section 8 for instructions.
CAUTION: FIELD SERVICE: Before attempting to diagnose or service a valve, please make sure that you have familiarized yourself with the
safe operation and maintenance of the valve (See Section 7). Compressed air and strong spring forces present potential hazards.
Make sure the valve is in a “safe state” before servicing by disconnecting the air supply line and/or the solenoid pilot valve power
supply.
CAUTION: FIELD SERVICE: While performing work on the N-Series valve, be certain to use only proper tools and any special fixtures or
assembly aids recommended or supplied by Nor-Cal Products.
6.1 Valve Will Not Close and Remains Fully or Partially Open
Observe the pneumatic connection on top of the valve to watch the valve stem rise and fall. A completely closed valve should show the valve stem / push-to-fit-
connector interface flush with the top cap of the valve. If the valve does not appear to be closing completely, possible causes include:
• An obstruction inside the valve that prevents the poppet from seating all the way (ex. process debris).
• A broken or worn spring in the valve actuator.
• Degraded or inadequate lubrication in the pneumatic cylinder.
• A complete or partial blockage of the air vent from the pneumatic cylinder
• A faulty solenoid valve, whereby it does not cut off pneumatic supply to the valve or allow the pneumatic cylinder to vent.
Input: +5 to +28 VDC
Output: NPN Standard
PNP Option available on request
FIGURE 5.5.1