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Danfoss AK-PC 351 User Manual

Danfoss AK-PC 351
22 pages
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Capacity Controller
AK-PC 351
User Guide
ADAP-KOOL® Refrigeration Control System

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Danfoss AK-PC 351 Specifications

General IconGeneral
Input Voltage24 V AC/DC
Number of Analog Inputs4
Number of Triac Outputs2
Communication ProtocolModbus RTU
EnclosureIP20
Output Voltage24 V AC/DC
Power Consumption5 W
Housing MaterialPlastic
Control TypePID
Storage Temperature-20°C to +70°C
Relative Humidity0 to 90% (non-condensing)

Summary

Introduction to Capacity Controller AK-PC 351

Application Overview

The controller is used for capacity regulation of compressors and condensers in small refrigeration applications.

Key Advantages

Energy savings via: Optimisation of suction pressure, Night set back, Floating condensing pressure.

Input and Output Capabilities

Details available inputs and outputs for the controller, including analogue, digital, and relay types.

Controller Operation

Explains daily operation, password protection, and language selection for the controller.

Data Communication Features

Describes the built-in Modbus data communication and connection to AK-SM 800.

Suction Group Operation

Compressor Types for Suction Groups

Lists the types of compressor combinations that can be used for regulation in a suction group.

Suction Capacity Regulation

Explains how cut-in capacity is controlled by pressure sensors and set reference, including neutral zone.

Suction Control Sensor

Details the control sensor for suction groups, typically a Po pressure transmitter or S4 sensor.

Suction Regulation Reference

Describes using set or variable references for regulation, including night time increase and limits.

Condenser Control

Condenser Fan Control

Explains incremental and speed control of fans using relays or analogue output.

Condenser Regulation

Details regulation based on Pc pressure or S7 media temperature sensor, and regulation reference.

Media Temperature Control

Specifies using S7 sensor for media temperature control and high-pressure monitoring.

Safety Functions

Pressure and Temperature Safety Functions

Covers safety limits for suction pressure, condensing pressure, and discharge gas temperature.

Switch Inputs and General Alarm

Details functions of LP, HP switches (DI7/DI8) and general alarm input (DI8).

Sensor Failure Handling

Explains actions and alarms triggered by sensor failures for various sensors.

Display Overview

End-User Interface Examples

Illustrates daily user interface displays for one suction group, one condenser group, or a combination.

Set-up Overview

Initial Setup Screen

Describes the initial screen upon delivery and how to access password entry.

Password Entry

Explains the default password and how to set it using arrow keys.

Setup Wizard Guide

Guides the user through a series of settings to prepare the controller for start-up.

Main Menu Navigation

Details the options available in the main menu, including Plant type selection.

Menu Options

Start/Stop and Configuration Parameters

Covers starting/stopping regulation, plant type, refrigerant, and unit settings.

Mains Frequency and Alarm Output

Details setting mains frequency and configuring the alarm output relay.

Suction Group Settings

Suction Control Status and Zones

Provides overview of control status, regulation, and pressure zones.

Suction Measurement Readings

Displays sensor values, reference, running, and requested capacity.

Control Settings

Regulation Control Modes

Settings for regulation mode, reference setpoint, neutral zone, and night offset.

Regulation Timing and Limits

Sets regulation reference limits, PI control speed, and first step runtime.

Compressor Operation Delays

Configures pump down, emergency capacity, and start/off delays for compressors.

Configuration Options

Suction Control Sensor Selection

Selects the regulating sensor for the suction circuit, e.g., Po or S4.

Compressor Mode Configuration

Compressor Timers

Lead Compressor Timers

Configures minimum ON/OFF times, restart, and safety delay for the lead compressor.

Remaining Compressor Timers

Configures minimum ON/OFF times, restart, and safety delay for remaining compressors.

Compressor Status Monitoring

Compressor 1 Status Details

Provides details on compressor 1's Sd gas temperature and operating status.

Compressor Capacity and Runtime

Reads connected capacity and total operating hours for compressors.

Compressor Service Mode

Allows taking a compressor out of operation for regulation purposes.

Condenser Operation and Control

Condenser Status and Control Modes

Displays condenser status, readings, and configures control modes and setpoints.

Condenser PI Regulation Tuning

Adjusts PI regulation parameters like gain factor Kp and integration time Tn.

Condenser Fan Configuration

Condenser Fan Control Sensor

Selects the regulating sensor for the condenser fan control circuit.

Condenser Fan Reference Settings

Sets sensor selection, pressure ranges, and reference mode for fan control.

Fan Control and Safety

Fan Mode and Control Type

Configures fan modes, control type (PI/P), and status monitoring.

Suction Safety Limits and Alarms

Configures suction pressure safety limits and alarm delays.

Condenser and Temperature Safety Limits

Sets limits for condensing pressure, temperature, and S7 sensor with delays.

Safety Restart and Sensor Reset

Configures delayed restart after safety cut-out and sensor alarm reset.

General Functions and System Settings

Digital Input Configuration

Configures digital inputs for various functions like LP/HP switch, alarm, and text.

System Settings (Units, Display, Time)

Configures display, language, units, screen saver, and logout time.

Security and Network Settings

Password and Access Control

Sets access codes for three levels: viewing, installer, and configuration.

Network and Factory Reset

Configures network settings and performs factory reset.

I/O Configuration

Digital Output Configuration

Details digital output setup for PWM, compressors, fans, and alarms.

Digital Input Configuration

Details fixed connection points for digital inputs, including safety and general alarm functions.

Analog Output Configuration

Explains analog outputs AO1 and AO2 for compressor and fan speed control.

Analog Input Configuration

Lists automatic setup of analog inputs for temperature and pressure sensors.

I/O Status Monitoring

Digital Output Status

Shows the current status (on/off) of the digital outputs.

Digital Input Status

Shows the status of the digital input signals.

Analog Output Status

Shows the size of the analogue output signals as a percentage of max signal.

Analog Input Status

Shows pressure and temperature values received by the controller.

I/O Manual Control

Manual Control of Digital Outputs

Allows manual control of relay outputs, switching between Auto, On, or Off.

Manual Control of Analog Outputs

Allows manual control of analog outputs, changing signal from 0-100%.

Alarm Priorities

General Alarm Priorities

Sets alarm notification importance for general incidents, standby mode, and sensor errors.

Suction Group Alarm Priorities

Defines alarm priorities for low pressure, high pressure, and compressor safety.

Condenser Alarm Priorities

Defines alarm priorities for high pressure and fan safety.

Setup Wizard and Alarm List

Setup Wizard Guide

Leads through settings for controller configuration, including IO connections.

Alarm List Details

Lists general, suction, condenser, and sensor alarms with reasons.

Connections with Setup Wizard

Digital Output Assignment

Explains automatic output assignment by the Setup Wizard based on priority.

Digital Input Assignment

Details the establishment of digital inputs for safety, switches, and alarm functions.

Analog Output Assignment

Describes analog outputs AO1 for compressor speed and AO2 for condenser speed control.

Analog Input Assignment

Lists analog inputs for temperature, pressure, and media sensors.

Connections

Digital Output and Input Connections

Details digital output and input connections and specifications.

Analog Output and Input Connections

Details analog output and input connections and specifications.

Supply Voltage and Modbus

Specifies supply voltage requirements and Modbus communication setup.

Digital Scroll Compressor Capacity

Digital Scroll Sd Monitoring

Explains how Sd monitoring increases capacity for better cooling of digital scroll compressors.

Stream Compressor and Injection Off

Stream Compressor Control

Details PWM signal control for stream compressors with unloader valves.

Injection Off Function

Explains closing expansion valves to prevent evaporator overfilling during regulation restarts.

Technical Data and Specifications

Electrical and Communication Data

Details supply voltage, frequency, and Modbus communication.

Input/Output and Environmental Data

Specifies I/O data, environmental conditions, density, weight, and mounting.

Approvals and Component Details

Lists approvals, component references, and load connection notes.

Mounting and Dimensions

DIN Rail Mounting Information

Provides dimensions and notes DIN rail mounting suitability.

Ordering Information

AK-PC 351 Product Details

Details the product type, function, operation, supply voltage, and code number.

List of Literature

Installation Guide for Extended Operation RC8AC

Guide for data communication connection to ADAP-KOOL® Refrigeration control systems.

Installation Considerations

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