Configured for redundant AC‑input DC‑output conversion in HC900/ControlEdge systems, the Honeywell 2MLR‑AC22 (2MLR‑AC22 power supply module) provides regulated 5 VDC output, RUN‑contact signaling, and stable backplane energizing for controller and I/O assemblies under 220 VAC operation.
Hardware Specifications
Parameter
Specification
Model
2MLR‑AC22
Brand
Honeywell
Origin
HC900 / ControlEdge Platform
Weight
382 g
Dimensions
55 mm W × 95 mm H × 90 mm D
Operating Temp
Not specified
Power Consumption
Max input power 110 VA / 42 W
Input Voltage
176–264 V AC (rated 220 V AC)
Input Frequency
47–63 Hz
Efficiency
≥65%
Input Fuse
Built‑in, non‑replaceable (AC: 250 V / 3.15 A time‑lag; DC: 125 V / 10 A time‑lag)
Allowed Interruption
Within 20 ms
Output Voltage
5 VDC (±2%)
Output Current
5.5 A
Output Power
27.5 W @ 55 deg C
Over‑Current Protection
6.0 A to 13.0 A
RUN Contact
24 VDC, 0.5 A (min load 5 VDC, 1 mA)
Response Time
Off→On ≤10 ms / On→Off ≤12 ms
Voltage Status LED
On when output voltage is normal
Cable Spec
0.75–2 mm²
Terminal Type
RAV1.25‑3.5, RAV2‑3.5
4‑20 mA HART Loop Protocol and Channel Isolation Behavior
Although the 2MLR‑AC22 is a power supply rather than a measurement module, its regulated 5 VDC output stabilizes HC900 backplane conditions for modules handling 4‑20 mA HART loop protocol. Controlled ripple and over‑current protection help maintain predictable analog update timing. HC900 I/O modules retain channel‑to‑channel isolation, preventing cross‑loop interference even under varying load conditions.
Frequently Asked Questions
Q: Can the 2MLR‑AC22 be hot‑swapped while the rack is energized? A: No. The module must be inserted or removed only when the HC900/ControlEdge chassis is de‑energized.
Q: What happens during a brief AC input interruption? A: The module tolerates instantaneous interruptions within 20 ms without dropping the regulated 5 VDC output.
Q: Is the built‑in fuse user‑replaceable? A: No. Both AC and DC fuses are internal and non‑replaceable.
Field Installation Guidelines
Maintain proper torque on clamped terminals using 0.75–2 mm² conductors.
Route AC input wiring separately from low‑voltage DC output conductors to reduce electromagnetic coupling.
Bond shielded cable grounds at a single termination point to avoid circulating currents.
Ensure adequate airflow around the module to prevent thermal buildup.
Verify RUN‑contact wiring polarity and load requirements before commissioning.
