Emerson SS4301T02 LS DI Dry Contact CHARM Overview

The Emerson SS4301T02 is a low-side discrete input CHARM. Specifically, it belongs to the CHARM series from Emerson. Therefore, this module senses 24V DC dry contact signals. For low frequency discrete state sensors, users select the SS4301T02 regularly. Additionally, the module supports fault detection with an optional field resistor pack. Finally, it operates with configurable channel types below 2 Hz.

Technical Specifications of SS4301T02

The Emerson SS4301T02 carries product number SS4301T02. Specifically, the product type is low-side discrete input CHARM. Furthermore, it accepts 24V DC dry contact sensors exclusively. For the On state, detection level exceeds 2.25 mA. This condition corresponds to less than 5.3 kΩ resistance. Regarding the Off state, detection level falls below 1.75 mA. This condition corresponds to greater than 8.2 kΩ resistance.

Channel impedance is 4.8 kΩ for consistent sensing. Wetting voltage measures 22.5 Volts with ±5% tolerance. Additionally, the current is limited to 12.5 mA nominal. Consequently, the SS4301T02 protects sensitive field contacts. For fault detection, an optional field resistor pack is required. Without the resistor pack, fault detection is simply not possible. Field circuit protection uses a 12.5 mA current limiting circuit.

For short circuits, guaranteed detection occurs below 100 Ω. Good status is guaranteed from 400 Ω to 40 kΩ. Regarding open circuits, detection triggers above 75 kΩ. Therefore, the SS4301T02 provides clear diagnostic boundaries. Configurable channel types include discrete input for dry contacts. Alternatively, discrete state sensors changing below 2 Hz also work. Field wiring disconnect is supported for safe maintenance.

CHARM power requirement is 18 mA maximum at 24V DC. Heat dissipation reaches only 0.33 Watts per CHARM. Consequently, multiple SS4301T02 modules can operate together without overheating. The low-side sensing method references the load to ground. Thus, the module detects when the contact closes to ground.

Installation Guidelines for Emerson SS4301T02

First, insert the SS4301T02 into a CHARM terminal block. Then, push firmly until the latch clicks into place. After that, connect the dry contact wires to the input terminals. Next, install an optional field resistor pack for fault detection. Subsequently, verify the contact resistance matches the detection ranges. Finally, apply 24V DC power to the CHARM backplane.

For all field wiring, use twisted pair cables. Keep cable lengths under 300 meters for reliable sensing. After wiring, configure the channel type as discrete input in the DeltaV system. Then, test the On and Off detection levels with a known contact. Never apply voltage above 30V DC to the input terminals. Finally, monitor the fault detection status through the control system.

Package Contents of SS4301T02

Your shipment includes these items:

One Emerson SS4301T02 LS DI dry contact CHARM

One CHARM identification label

One quick start installation guide

However, the package does not include the field resistor pack. Therefore, you must purchase the resistor pack separately for fault detection. Also, no CHARM terminal base is provided with this module. Finally, wiring tools are not included in the shipment.

Frequently Asked Questions about SS4301T02

1. How does fault detection work on the SS4301T02?

The Emerson SS4301T02 requires an optional field resistor pack for fault detection. Specifically, the resistor pack enables open and short circuit detection. Without it, the module only detects On and Off states. Therefore, order the resistor pack if fault detection is needed.

2. What is the maximum switching frequency for this CHARM?

The SS4301T02 supports discrete inputs changing below 2 Hz. Specifically, this is suitable for dry contacts and slow state sensors. Do not use this CHARM for high speed counting applications. For faster signals, select a different CHARM model instead.

3. What does low-side sense mean on the SS4301T02?

Low-side sense on Emerson SS4301T02 means the module detects when the contact closes to ground. Specifically, the wetting voltage is applied to the contact. One side of the contact connects to the module input. The other side connects directly to ground.

4. How much power does the SS4301T02 consume?

The SS4301T02 consumes 18 mA maximum at 24V DC. Specifically, heat dissipation is only 0.33 Watts. Therefore, many CHARM modules can mount close together. Active cooling is not required for normal operation.

5. What are the guaranteed fault detection ranges for this module?

The Emerson SS4301T02 detects short circuits below 100 Ω. Good status is guaranteed from 400 Ω to 40 kΩ. Open circuits above 75 kΩ trigger a fault. Therefore, design your field wiring to stay within these ranges.

Compatibility and Application Notes

The Emerson SS4301T02 works with DeltaV CHARM I/O systems. Specifically, it mounts into any CHARM terminal base. This module provides low-side discrete input for dry contacts. Therefore, use it for limit switches, push buttons, and relay contacts. The 12.5 mA current limiting protects against wiring faults. HS code for customs is 85389000. Finally, store the CHARM in anti-static packaging before installation. Emerson manufactures this product under the DeltaV brand.