Danfoss AK-PC 551 User manual

AK-PC 551 Refrigeration Controller

Technical brochure

2 Technical brochure RC8CF102 © Danfoss 08-2014 AK-PC 551

AK-PC 551 Technical brochure RC8CF102 © Danfoss 08-2014 3

Content

Introduction �� 4

Applications 4

Compressor combinations 5

Condenser combinations 5

Inputs and outputs 5

Basic Operation�� 6

Status 6

Password 6

Logout 6

Setup & service 6

View parameters 8

Change parameters 8

Day / night schedule 8

First time start up �� 9

Conguration 9

Example: Application�� 10

Application: Digital scroll 10

Example: Wiring Diagram�� 11

Electrical wiring 11

Connection, lower level 11

Electrical diagram 11

Connection, upper level 11

Example: Wizard�� 12

Wizard setup 12

Example: Check IO conguration�� 14

Wizard assignment of inputs and outputs (I/0) 14

Assignment of inputs and outputs 14

IO conguration error 15

Example: Add extra I/O �� 16

Example: Check I/O wiring�� 17

Initialize the controllers IO conguration 17

Network setup�� 18

Example: Quick conguration �� 19

Quick conguration 19

Application table 20

Frequently asked questions (FAQ)�� 22

4 Technical brochure RC8CF102 © Danfoss 08-2014 AK-PC 551

Introduction

This technical brochure will give you a short introduction to

the AK-PC 551 pack controller� With an application example, it

is shown how easy the controller is congured and operated

through the graphical display�

The AK-PC 551 is a pack controller for 1 or 2 suction groups of

compressors and a common condenser�

AK-PC 551 supports a variety of compressor combinations

including variable speed, Digital scroll and Stream 4 cylinder

compressors� Additionally it oers a large number of energy

saving functions and optimization features�

AK-PC 551 can be fully congured through a LCD display� The LCD

display can be built in and/or be a remote connected display�

AK-PC 551 has a compact size of 8 DIN modules� All inputs and

outputs can be congured for a variety of functions making the

controller highly adaptable to any pack application�

AK-PC 551 can be connected into a MODBUS communication

network and is available with 24 Vac or 110-230 Vac power supply�

Applications

AK-PC 551 is used for capacity control of compressors and

condenser fans on small to medium sized refrigeration

systems� It covers the following main applications:

• One compressor group (max� 8 relays) and one condenser

group

• Two compressor groups (max� 4 relays per group) and a

common condenser

AK-PC 551 Technical brochure RC8CF102 © Danfoss 08-2014 5

Introduction

Compressor combinations

The compressor capacity can be controlled according to the

suction pressure Po or a media temperature sensor S4�

AK-PC 551 covers a variety of compressor combinations�

Inputs and outputs

All in- and outputs of an AK-PC 551 controller can be congured

for various functions and signal types:

• 8 analogue inputs for pressure transmitters and temperature

sensors�

• 6 digital relay outputs for compressors, fans, alarm�

• 2 digital solid state outputs for PWM control of Digital scroll

or Stream compressor� If not used for this purpose they can

be used as normal relay outputs�

• 2 analogue outputs for speed control of compressors and

condenser fans�

Speed control of all fans Step control of all fans

Condenser combinations

The condenser capacity can be controlled according to the

condensing pressure Pc or a media temperature sensor S7

The condenser can be controlled in two ways:

• Speed control of all fans

• Step control of single fans

6 Technical brochure RC8CF102 © Danfoss 08-2014 AK-PC 551

Basic Operation

Suction statusHome Condenser status Active alarms Cleared alarms Controller information

From any status screen press ENTER for

2 sec� to access main menu

Press ESCAPE to

go one level back

Password

Parameters and menus are protected by a

password that gives access on 3 dierent

user levels�

Level 0: See parameters (000)

Level 1: Change weekly schedule (100)

Level 2: Change control setpoints (200)

Level 3: Change conguration setpoints (300)

The password cannot be reset, so please

remember the (level 3) password�

Logout

Go to the "Home" screen and hold down the

X key for 5 seconds to logout�

Setup & service

In the main menu you will nd all control

parameters divided into sub menus�

Press ESCAPE to go back to status

Press UP to decrease digit

Press DOWN to increase digit

Press ENTER to login

Press LEFT / RIGHT to go to next / previous digit

Conguration and daily operation of AK-PC 551 is done via the

built-in display or via a remote connected display� The display

supports multiple languages and engineering units�

For a full description of the controller parameters please see the

manual RS8GY

Status

Get an overview of how the system is running in the status

screens� Use the LEFT / RIGHT buttons to view the status screens�

AK-PC 551 Technical brochure RC8CF102 © Danfoss 08-2014 7

Suction reference

Condenser reference

Condenser control sensor readout

Number of fans running

(1 of 2 fans is running)

Suction reference

Suction control sensor readout

Number of compressors running

(1 of 2 compressors is running)

The number of status screens and the presented data depends

upon the congured application�

Running compressor capacity

Condenser control sensor

Condenser reference

Suction control sensor

Basic Operation

Suction status

Home

Active alarms

Controller information

Cleared alarms

Press ENTER to see

alarm details

Press ENTER to see

cleared alarm details

Running fan capacity

? temperature

Condenser control sensor

Condenser status

Alarm priority Alarm priority

Alarm text

Active alarm Cleared alarm

Alarm activated at Alarm activated at

Alarm cleared at

Technical controller information

like code number and software

version etc�

To clear an alarm press ESC (X) for 2 sec�

8 Technical brochure RC8CF102 © Danfoss 08-2014 AK-PC 551

Press ESCAPE to go one level back

Press UP to increace the time

Press DOWN to decrease the time

Press ENTER to save the setting

Basic Operation

Day / night schedule

View parameters

The display will only present parameters that are valid for the

congured application e�g� if 4 compressors are selected only 4 are

showed�

A partly highlighted row indicates that a parameter can be viewed

and not changed�

Change parameters

A full highlighted row indicates that a parameter can be changed�

A changable parameter has a frame around the setting�

Control status menu

Control settings menu

Control status readout

Setpoint readout

Setpoint selected

Press ESCAPE to go one level back

Press ESCAPE to go back one level

Press ESCAPE to go one level back

Press UP to increace the setpoint

Press DOWN to see next parameter

Press DOWN to decrease the setpoint

Press ENTER to edit a parameterPress ENTER

to select

setpoint

Press ENTER

to select

control

status

Press ENTER to save the setpoint

Press LEFT / RIGHT to go to hour / minute

Press ENTER to select day

System menu

Press ENTER

to select

weekly

schedule

Weekly schedule

Monday open time

AK-PC 551 Technical brochure RC8CF102 © Danfoss 08-2014 9

Conguration

After installation the controller must be congured for an

application� Once power is applied to the controller, the "Power

on" screen will appear�

Use one of the three options to congure the controller:

• Setup wizard

• Quick configuration

• Parametric setup

Setup wizard

Setup wizard is a step by step up and running guideline, setting

up inputs and outputs automatically�

Quick conguration

Quick conguration is a series of precongured applications,

setting up inputs and outputs automatically�

Parametric setup

Parametric setup is for the expert user, who wants to set each

parameter individually, adjust or netune settings�

First time start up

Quick start

Power on screen

Press ENTER for 2 sec�

and enter password (300)

to access quick start

10 Technical brochure RC8CF102 © Danfoss 08-2014 AK-PC 551

Example: Application

Application: Digital scroll

The conguration and daily operation of the AK-PC 551 will be

explained via an application example:

AK-PC 551 controls a refrigeration system with two suction

groups of compressors and a common air cooled condenser�

Refrigerant: R404A

Suction group MT:

1 digital scroll compressor

2 single step scroll compressors

Control according to suction pressure Po

Set point -15 °C

Monitoring of discharge temperature of digital scroll

Suction group LT:

2 single step scroll compressors

Control according to suction pressure Po

Set point -30°C

Condenser:

Speed control of 4 fans

Common safety monitoring of fans

Relay output for start/stop of VSD

Control according to condensing pressure Pc

Floating reference according to Sc3 outdoor temp�

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