Overview

In this article, we explain how the RS case sealer is interlocked with the CRX indexer for machines with serial numbers below 25.

This configuration prevents the CRX from feeding a new carton into the RS while the RS is actively sealing a carton.

The same interlock concept applies to later serial numbers, but terminal numbers may differ.

Application

Machine sequence:

Conveyor → CRX → RS

The CRX feeds cartons into the RS.
When the RS is actively sealing, the CRX must stop indexing to prevent carton jams.

This interlock uses the RS motor contactor auxiliary contact as a “busy” signal.

Wiring (Serial Series <25)

RS Output

• Terminals: 22 – 23

• Device: MS1 auxiliary contact (63–64)

• Type: Normally Closed (NC) dry contact

CRX Input

• Terminals: 12 – 13 (LINK)

Field Wiring

This is a dry contact loop. No polarity required.

Contact Behavior

The RS contact is Normally Closed (NC).

When the RS motor contactor (MS1) energizes during sealing, the auxiliary contact opens.
This opens the CRX LINK circuit and stops the CRX from feeding another carton.

When the RS completes the cycle and the motor de-energizes, the contact closes and CRX is allowed to index the next carton.

Important Clarification

Although the RS schematic may label this contact “READY-TO-RECEIVE,” functionally it operates as a busy inhibit signal in this application.

Do not assume the label defines the behavior.
Always verify contact type (NC vs NO) from the schematic symbol or by meter test.

Electrical Warning

RS terminals 22–23 are a dry contact only.

• Do NOT apply 110VAC to these terminals.

• Do NOT connect to a powered output.

• CRX supplies control voltage internally through the LINK circuit.

Applying voltage to 22–23 will damage control components.

Verification Procedure

The interlock is based on RS motor contactor (MS1) state, not main power.

Step 1 – RS Idle (Motor NOT Running)

• RS powered ON but not sealing.

• MS1 de-energized.

• Measure continuity across RS 22–23.

Expected result: Closed

• Measure across CRX 12–13 (LINK).

• Expected result: Closed

CRX should be allowed to index.

Step 2 – RS Sealing (Motor Running)

• Trigger a sealing cycle so MS1 energizes.

• Measure continuity across RS 22–23.

Expected result: Open

• Measure across CRX 12–13.

Expected result: Open

CRX must stop indexing while RS motor is running.

Step 3 – Functional Test

1. Start a carton into RS.

2. While RS motor is engaged:

   • Attempt to trigger CRX.

   • CRX must not index.

3. After RS completes cycle and motor stops:

   • CRX should resume indexing.

Important

Do not verify this interlock based on:

• Main disconnect position

• Control power lamp

• RS in AUTO mode

The only thing that matters is whether MS1 is energized (motor running).

Serial Number Note

This article applies to RS and CRX machines with serial numbers below 25.

For later serial numbers:

• The interlock concept remains the same.

• Terminal numbers and wire numbers may differ.

• Always verify terminal identification before wiring.