1. Introduction

This procedure provides step-by-step instructions for checking the combi command output in the Hydraulic Type VRCS system. Proper voltage measurements and lamp indications ensure correct valve operation.

2. Voltage Measurement for Valve Operation

2.1 Measuring Voltage for Valve Open

1. Measure the voltage between Terminal 9 and Terminal 13.
   • When the valve is NOT operating: Voltage should be around AC 220V.
2. Open the valve using remote or local control.
   • During valve opening: Voltage should drop to 0V.
   • After 3 seconds: Voltage should return to AC 220V.

2.2 Measuring Voltage for Valve Close

1. Measure the voltage between Terminal 10 and Terminal 13.
   • When the valve is NOT operating: Voltage should be around AC 220V.
2. Close the valve using remote or local control.
   • During valve closing: Voltage should drop to 0V.
   • After 3 seconds: Voltage should return to AC 220V.

3. VRCS Monitor Lamp Indication Check

• If the CL (Close) lamp is ON, the valve should be closed on the VRCS Monitor.
• If the OP (Open) lamp is ON, the valve should be open on the VRCS Monitor.
• ⚠️ If the lamp indication is incorrect, there is likely an issue with the combi module.

4. Troubleshooting Lamp Malfunctions

• If any lamp is always OFF, perform a short connection test:

  For CL (Close) Lamp Test:

  • Create a short connection between Terminal 3 and Terminal 4.
  • The CL lamp should turn ON, and the valve status should indicate "Closed" on the VRCS Monitor.
  • 

  For OP (Open) Lamp Test:

  • Create a short connection between Terminal 1 and Terminal 2.
  • The OP lamp should turn ON, and the valve status should indicate "Open" on the VRCS Monitor.
  • 

5. Troubleshooting Summary

6. Additional Notes

• Ensure all connections are secure before testing.
• Perform measurements only when power is properly supplied to the system.
• Always confirm correct lamp indications before assuming a hardware fault.