Emerson E2 operation manual MultiFlex PAK Board, Lighting Schedules

11.9 MultiFlex PAK Board

The PAK is a distributed pack (rack) controller that controls compressors and condenser fans. The PAK can control up to 8 compressor groups containing up to 16 compressors. The compressor control strategy is Fixed Steps with setpoint/deadband using ON and OFF delays. Up to 20 Fixed Steps can be configured.

The PAK can control up to 4 condenser fan groups containing up to 8 total condenser fans. The PAK con- denser control strategy is sequential TD control with set- point/deadband using ON and OFF delays.

The PAK has a compressor/condenser interlock fea- ture that will override TD control and force the condenser fans to stage off using the TD control OFF delay when all compressors are off. This feature can be disabled with an Enable/Disable setpoint or when the discharge pressure is above a configurable setpoint.

The MultiFlex PAK boards consist of two circuit

boards: a bottom layer with 16 combination digital/analog inputs, and a plug-in top layer which contains a combina- tion of 8 relay outputs and 4 digital DC voltage outputs.

The analog outputs on the Multiflex PAK drive solid state relays to control the fan stages. The relays control the compressor groups.

The communication interface is RS485 I/O using the Standard Extended Address Form for Emerson Retail Solutions Distributed Controllers. Currently, the PAK is designed to interface with the Emerson Retail Solutions Einstein and E2 controllers.

The MultiFlex PAK has its own installation and opera- tion manual, P/N 026-1712.

11.10 Lighting Schedules

This section explains the function of E2’s Lighting Schedule application. It includes an overview of how the application works and instructions on how to program it.

11.10.1 Overview

The Lighting Schedule application provides an inter- face for Cut In/Cut Out control based on light level, simple time scheduling with or without use of external Time Schedule applications, proofing, minimum on/off times, solar control, and output dimming control.

Generally, the Lighting Schedule application is designed to follow a digital command from a time sched- ule to determine when the lights should be ON or OFF. At the same time, Lighting Schedule looks at the value of a light level sensor, compares it to a set of Cut In/Cut Out

setpoints, and overrides the schedule as the real-time light- ing conditions warrant. As a result, the light level sensor and schedule both work to provide adequate light when needed AND saving energy by keeping lights OFF when they are not necessary.

MultiFlex PAK Board Software Overview • 11-31