Honeywell 900H03-0202 8-Channel AC Digital Output

Honeywell 900H03-0202 8-Channel AC Digital Output Module

Product Introduction

The Honeywell 900H03-0202 delivers eight isolated Triac outputs for AC loads from 85 VAC up to 240 VAC. Each channel includes a green LED state indicator. A blinking green status LED shows normal scanning, while a red LED signals diagnostic conditions. This module also supports a fail-safe state, which you can set to "Hold Last State" or a predefined safe value.

Key Technical Specifications

Outputs and Isolation
The 900H03-0202 offers 8 independent outputs with galvanic isolation between each output and the logic side. This isolation prevents cross-channel interference. Each output uses a Triac with zero-voltage switching to reduce electrical noise.

Voltage and Frequency Range
Operating voltage ranges from 85 VAC to 240 VAC, with a peak rating of 250 VAC. The module accepts AC frequencies between 47 Hz and 63 Hz. Therefore, it works with most industrial power systems worldwide.

Load and Current Ratings
Maximum load current reaches 2 A per point and 8 A total per module for resistive loads. The minimum load required is 50 mA. Leakage current stays below 4 mA at 240 VAC, 60 Hz, ensuring efficient off-state performance.

Protection and Fuses
Each output includes a MOV for transient overvoltage protection. Additionally, a field-replaceable fuse (3.15 A time-lag, Littelfuse 37413150410) protects each channel. You can quickly replace a blown fuse without replacing the whole module.

Response Time
OFF to ON response time is 3 ms plus up to 0.5 line cycle maximum. Similarly, ON to OFF response time is also 3 ms plus 0.5 line cycle maximum. Note that these values exclude controller scan time and backplane transmission delays.

Mechanical and Environmental Information

Status LEDs
A green LED per channel lights up when the output is ON. A blinking green status LED on the module confirms that the module is being scanned. A red status LED indicates a module diagnostic condition.

Fail-Safe State Configuration
The 900H03-0202 supports two fail-safe behaviors: Hold Last State or a predefined Failsafe State. This feature enhances system safety during communication errors.

Physical Design
A shorting comb (900J02-0001 or 900J10-0001) is available for barrier-type terminal blocks. This comb simplifies wiring when you use a common voltage source for all outputs.

Installation Guidelines

Mounting
First, ensure the backplane power is off before installation. Then, insert the Honeywell 900H03-0202 into an appropriate I/O slot. Press firmly until the module locks in place.

Wiring
Use the shorting comb to connect a common AC voltage source to all outputs. This step reduces wiring time and errors. For each output, connect the load between the output terminal and the neutral line. Each channel has its own fuse and MOV for protection.

Fuse Replacement
Turn off the output load before replacing a fuse. Then, remove the old fuse and insert a new Littelfuse 37413150410. Only use the specified time-lag fuse to maintain safety ratings.

Frequently Asked Questions (FAQ)

1. Can I use the Honeywell 900H03-0202 with 120 VAC and 240 VAC systems?
Yes, the module operates from 85 VAC to 240 VAC, covering both standard voltages.

2. What happens if one output fails?
Each output has an independent fuse. Therefore, a single failed output does not affect the other seven channels.

3. Do I need external snubbers for inductive loads?
The module includes MOV protection per output. However, for highly inductive loads, external snubbers may still be recommended.

4. How do I know if the module is working correctly?
A blinking green status LED shows normal scanning. A red LED indicates a diagnostic issue.

5. Can I replace the fuse while the module is powered?
For safety, turn off the output load before replacing any fuse. The module supports field replacement but only with power removed from the output side.