Description
Product Parameters
- Brand: Honeywell Analytics (Formerly Sieger / Zellweger)
- Model Number: 05701-A-0501
- Issue / Revision Status: ISS 08 (Issue 08)
- Type: 16-Way Sub-Rack Assembly
- Wiring Access: Front Access (Designed for front-facing field wiring and maintenance)
- Form Factor / Size: Standard 19-inch wide, 6U high configuration
- Compatible System: Honeywell System 57 (5701 Gas Control Cards, 5704F Fire Control Cards)
- Slot Capacity: Accommodates up to 16 single-channel control cards, along with an engineering card and DC input card. The Honeywell 05701-A-0501 (ISS 08) is a robust 16-way front-access rack assembly belonging to the specialized System 57 industrial gas and flame detection series. Measuring a standard 19 inches wide by 6U high, this sub-rack frame is purposely built to securely house, power, and interconnect up to 16 control channels alongside vital backplane communication cards. Its distinctive front-access engineering streamlines space-constrained control panel footprints by channeling both field sensor wiring and card installations straight through the front console, guaranteeing reliable high-integrity monitoring in critical fire and gas safety operations.
Comparison with Similar Models
The 05701-A-0501 is distinguished from alternative chassis configurations in the Honeywell System 57 line by structural alignment, wiring access, and capacity variants:
- Front Access vs. Rear Access (05701-A-0502): The standard 05701-A-0502 model requires field wiring to be linked at the rear of the panel, demanding a centered split-backplane design. Conversely, the 05701-A-0501 routes all field wiring through the front profile using stacked vertical board orientations, allowing panels to be mounted flush against solid walls.
- Form Factor Profile (3U vs. 6U): While 19-inch rear-access sub-racks often occupy a lower 3U height footprint, this front-access model extends into a 6U profile to properly accommodate both the interface/relay blocks and control cards mounted directly on top of each other.
- Capacity Edge over 8-Way Half Racks: Unlike smaller half-rack form factors built for entry-level deployments of up to 8 channels, this 16-way chassis maximizes density, enabling complex gas monitoring networks to integrate zone-wide alarm logic across 16 channels inside a single industrial enclosure.
Product Operation Tips
- Card Alignment Check During Insertion: When sliding 5701 or 5704 control cards into the front tracks of the rack, ensure they line up perfectly with the guide rails before forcing them inward. Forcing a misaligned card can easily bend or shear the pins on the backplane plug-and-socket array.
- Grounding and Shielding Continuity: Since gas detection readings are sensitive to electromagnetic noise, verify that the sub-rack chassis is reliably bonded to the central cabinet earth ground. Ensure all incoming shielded field wires are terminated cleanly at the front-access interface grounding points to prevent signal drifting.
- Verify Power Budget Constraints: Prior to fully populating all 16 channels, calculate the total current draw of your installed toxic, catalytic, or infrared gas sensors. Ensure your DC input power supply card can handle the combined load, or utilize separate high-integrity auxiliary power loops directly hooked into the dedicated channel cards if necessary.
