Honeywell TC-RPSCA2 | Redundant Power Adapter

Product Overview

This chassis adapter manages power distribution between dual redundant power supplies for critical control systems. Industrial facilities demand uninterrupted operation to prevent costly production stoppages. The TC-RPSCA2 automatically switches between primary and backup power sources without any output interruption. Its rugged metal housing provides excellent electromagnetic interference shielding. Engineers can integrate this adapter seamlessly into existing Honeywell Series C cabinets. The unit’s hot-swappable design enables replacement without powering down the entire system.

Technical Specifications

Parameter	Specification
Input Voltage Range	20–32 VDC (per supply input)
Output Voltage	24 VDC (regulated)
Maximum Output Current	12 A continuous
Number of Input Channels	2 isolated power inputs
Number of Output Channels	1 main output + 1 auxiliary output
Switching Time	≤2 ms (automatic transfer)
Efficiency	≥90% at full load
Isolation Voltage	1500 VDC (input-to-output)
Overvoltage Protection	28 V clamping
Overcurrent Protection	15 A trip threshold
Operating Temperature	0°C to +60°C
Storage Temperature	–40°C to +85°C
Dimensions (W x H x D)	160 mm x 55 mm x 180 mm
Weight	1.2 kg
Mounting Type	Chassis mount with captive screws
Status Indicators	Input A/B OK, Output OK, Alarm, Transfer active

Redundancy Management and Transfer Logic

The TC-RPSCA2 continuously monitors both input voltages for any deviation outside acceptable limits. This adapter initiates an automatic transfer when the primary input drops below 18 VDC. The switching circuitry completes this transition within two milliseconds maximum. Active load sharing distributes current evenly when both supplies remain operational. The unit’s OR-ing diode configuration prevents reverse current flow between inputs. Thermal sensors shut down the adapter if internal temperatures exceed safe operating thresholds.

Power Capacity and Energy Storage

Internal capacitors store 2200 µF of energy to bridge brief transfer intervals. This storage capacity guarantees output stability during the two-millisecond switching period. The adapter dissipates approximately 8 watts as heat at full 12-amp load. Low internal resistance minimizes voltage drop across the main output path. The unit’s high efficiency reduces cooling requirements inside sealed cabinets.

Diagnostic and Alarm Capabilities

Individual LEDs indicate the status of each power input and the final output. An audible alarm triggers when the adapter operates on backup power for extended periods. The adapter provides dry-contact relay outputs for external annunciation systems. Diagnostic data passes through the system backplane for centralized monitoring. Users can test the automatic transfer function manually via a front-panel pushbutton.

Physical Construction and Installation

The steel enclosure measures 160 millimeters wide and 180 millimeters deep. This chassis adapter weighs 1.2 kilograms and requires robust mounting rails. Captive screws secure the unit firmly to the chassis baseplate. Front-accessible terminal blocks simplify wiring of power cables. The unit’s deep housing accommodates large gauge wire up to 6 mm².