N-EPC28-H-S-C

SKU: NEPC28HSC

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Current Stock: 20

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Optimizer Essential 28 – Page 1

OPTIMIZER ESSENTIAL CONTROLLERS

The Essential controller is a next generation small plant controller that utilizes the Niagara Framework® with optional Edge licensing, or full Niagara licensing to meet customer application needs. The Essential is a freely programmable IP device powered by a 64‑bit dual‑core i.MX processor, with 28 onboard input and output control points that provide extremely flexible control options. Using the power of the Niagara Framework®, the Essential controller provides both Ethernet & Serial integration options and is a native profile BACnet™ Building Controller (“B‑BC”).

The Essential controller has 28 onboard input and output control points (16 universal I/O channels, 4 relay outputs, 4 solid state relay outputs, and 4 digital inputs). The controller features:

  • RS‑485 ports for BACnet™ MS/TP, Panel Bus (Legacy IO and SnapON IO module devices), Modbus RTU, and M‑Bus.
  • Ethernet ports for BACnet™ IP devices, Modbus TCP/IP, and C‑Bus.
  • RJ11 port interface for HMI devices.
  • USB Type‑C interface port for serial communication.
  • DIN‑rail mounting (horizontal or vertical).

FEATURES AND HIGHLIGHTS

Simple and Flexible Engineering

  • Three RS‑485 non‑isolated ports and two Ethernet ports / switched IP ports.
  • Ethernet ports configurable as isolated or switched.
  • RJ11 port for dedicated HMI device.
  • Touch flake connections for RS‑485 IO module devices.
  • Switched Ethernet ports support daisy chain and RSTP.
  • Built‑in RSTP switch for loop‑free network topology.
  • i.MX 8M Mini dual Arm® Cortex®‑A53 processor, 1.2 GHz.
  • Supports BACnet™ SC configuration within Niagara Framework®.
  • Conforms to BACnet™ Standard ANSI/ASHRAE 135 protocol version 1.18.
  • Supports up to 555 points (Panel Bus + Global).

Efficiency and Safety on Site

  • Multi‑color LEDs for RS‑485, HMI, Ethernet, and service status.
  • Two isolated IP ports for secure communication.
  • Advanced diagnostics for IP and MS/TP devices.
  • FRAM storage for live controller data and last‑known values.
  • Protective end cover with embedded RS‑485 termination resistor.
  • UTF‑8 and UCS‑2 encoding support.
  • Ubuntu Core OS with snap‑based modular software design.
  • Supports 802.1x authentication (Niagara N4.15u1 Rev 8+).
  • Neural Net Accelerator for future low‑latency AI/ML algorithms.

Easy Upgrade

  • RS‑485 ports support Panel Bus, BACnet™ MS/TP, Modbus RTU, and M‑Bus.
  • Removable screw or push‑in terminal blocks.
  • Built‑in HTML5 web server for graphics.

Retrofit Applications

  • Form‑fit migration from CIPer™ 50 and EAGLEHAWK NX.
  • Functional retrofit migration for CIPer™ 30 non‑VAV applications.

Specifications


Optimizer Essential 28 – Page 9

Product Specification

Hardware

ParameterSpecification
Ferroelectric RAM (FRAM)512 KB
LPDDR42 GB
EMMC8 GB
CPUi.MX 8M Mini, dual Arm® Cortex®‑A53, 1.2 GHz
Operating SystemLinux 64‑bit
Real‑Time Clock Accuracy±3 ppm (±1.57 min/year)
Real‑Time Clock Retention72 hours (gold capacitor)

Electrical

ParameterSpecification
Operating Voltage (AC)24 VAC ±20% (19–29 VAC)
Operating Voltage (DC)24 VDC ±20% (20–30 VDC)
Overvoltage ProtectionMax 29 VAC or 40 VDC; terminals short‑circuit protected

Power Consumption

ControllerUIO (24 VAC)UIO (24 VDC)DI (24 VAC)DI (24 VDC)RO (24 VAC)RO (24 VDC)SSRO (24 VAC)SSRO (24 VDC)
N‑EPC28‑H‑S76.5 VA33.5 W63 VA27.5 W62.5 VA27.5 W62.5 VA27.5 W
N‑EPC28‑H‑P76.5 VA33.5 W63 VA27.5 W62.5 VA27.5 W62.5 VA27.5 W

Notes:

  • Total power with all IO in use: 80 VA / 35 W
  • Total power with no IO connected: 62 VA / 27.5 W
  • If total demand exceeds 100 VA (Class 2 limit), use external power and disconnect SR input from auxiliary output.

Current Consumption

ControllerUIO (24 VAC)UIO (24 VDC)DI (24 VAC)DI (24 VDC)RO (24 VAC)RO (24 VDC)SSRO (24 VAC)SSRO (24 VDC)
N‑EPC28‑H‑S3.2 A1.4 A2.6 A1.15 A2.6 A1.15 A2.6 A1.15 A
N‑EPC28‑H‑P3.2 A1.4 A2.6 A1.15 A2.6 A1.15 A2.6 A1.15 A

Notes:

  • Total current with all IO: 1.5 A (DC) / 3.4 A (AC)
  • Total current with no IO: 1.2 A (DC) / 2.7 A (AC)
  • Auxiliary supply max: 6 A
  • If demand exceeds 100 VA, external supply required (disconnect SR input).

Product Specification

Connection to Buses

ProtocolsMax Devices per ChannelRS‑485‑1RS‑485‑2RS‑485‑R (Wiring Adapter)
Panel Bus64YesYesYes
BACnet™ MS/TP64YesYesYes
Modbus RTU32YesYesYes
M‑Bus*60YesYesYes

Standards and Certifications

ParameterSpecification
Protection ClassIP20
Product Standards UL60730‑1, UL60730‑2‑9, UL916, IEC/EN60730‑1,
IEC/EN60730‑2‑9, CAN/CSA‑E60730‑1:02,
IEC/EN61326‑1, IEC/EN61010
Testing Electrical ComponentsIEC68
Certification UL60730‑1, UL916, CE, BTL B‑BC,
BACnet™ Standard 135 v1.14, ISO 16484‑5,
AMEV AS‑B, FCC Part 15, WEEE, C‑tick RCM,
CAN ICES‑3(B)/NMB‑3(B), RCM, EAC, RoHS II,
IEEE 802.3 Ethernet, EN‑1434‑3, EN‑13757‑3
Energy PerformanceEN12098‑1:2022, EN ISO 52120‑1:2022
System Transformer Safety isolating transformers per IEC 61558‑2‑6.
NEC Class 2 transformers required in USA/Canada.

Operational Environment

ParameterSpecification
Storage Temperature‑20 to 158 °F (‑28.9 to +70 °C)
Operating Temperature‑13 to 140 °F (‑25 to 60 °C)
Humidity5–95% RH (non‑condensing)
Vibration0.024″ (2–30 Hz), 0.6 g (30–300 Hz)
Dust/Vibration StandardEN60730‑1
ProtectionIP20 with optional terminal covers
Pollution Level2
Altitude13,123 ft (4000 m)

Notes

  • Communication rate depends on protocol.
  • Panel Bus supports up to 64 IO modules per channel, max 16 of each type.
  • Max Panel Bus points: 355
  • Max global points: 300
  • Max total points: 555
  • Performance depends on poll rate, wiresheets, PX pages, histories, alarms, and drivers.
  • The controller can act as an M‑Bus Master using a standard‑level converter (e.g., PW60).
  • A wiring adapter is required for RS‑485‑R communication and power.

Downloads


Product Data Sheet