Danfoss AK-PC 351 Data sheet

Fact sheet

Capacity Controller Type AK-PC 351

C:\Users\U250480\Pictures\IMG122426688432(AK_PC 351 Pack

Digital inputs

max. 8 pcs signal from automatic safety control, day/night signal

Analogue inputs

• Po suction pressure or S4 media temperature

• Pc condensing pressure or S7 media temperature

• Sc3 outdoor temperature

• Sd digital scroll/stream media temperature

Analogue outputs

max. 2 pcs for speed control of lead compressor and condenser fan

Controller).tif

Solid state relay

output 1 pcs control of bypass on a digital scroll or for controlling unloader on a stream compressor. If the

output is not used for the

function, it can be used as

ordinary relay output

Relay outputs

max. 5 pcs connection

of compressors, condenser fans

Compact and powerful

Suction control

Up to 4 compressors in a variety of combinations:

• Single step

• Variable speed

• Digital scroll

• Stream (4 cylinder)

• Multi step with unloader valves

Condenser control

• Step control of up to 4 fans

• Speed control

Optimised control algorithms and factory settings

• Low and high suction pressure safety

• High condensing pressure safety

• Automatic compressor and fan control override functions to avoid high pressure cut out

• Smart settings and gain scheduling based on Danfoss refrigeration know-how

• Pump down on last compressor to reduce start/stops at low load

Energy saving features

• Night setback via Digital input or network

• Floating condensing pressure control

• Suction pressure optimisation

Graphical user interface with

• Multi language support

• Overview screens

• Wizard programming

• Celsius or Fahrenheit / Bar or Psi

Application Description

Single step

Single step compressors of same size

Speed on lead

Speed compressor of one size single step compressors of another size

Digital scroll on lead

Digital scroll of one size single step compressors of another size

Stream 4 cyl. on lead

Stream 4 cyl. of on size single step compressors of another size

Multistep compressors

Multistep compressors with same no. of unloader valves and of same size

Technical data

Features Description

Supply voltage

4 analog Input

8 digital input

Relay output to capacity control

2 Voltage output 0-10 V d.c. Ri = 1kohm

Display output For type MMIGRS2

Data communication

Environments

Enclosure IP 40

Weight 0.2 kg

Mounting DIN-rail

Connection terminals

Approvals

24 V a.c. ± 15 % 50/60 Hz, 17 VA

24 V d.c. (20-60 V ), 17 VA

Pressure measuring: Ratiometric pressure transmitter type AKS 32R 1-5 volt pressure transmitter type AKS 32 0-20 (4-20) mA pressure transmitter type AKS 33

Temperature measurement Pt 1000 ohm/0 °C NTC - 86 K from digital scroll/stream

From contact function E.g. to: Start/stop of regulation Monitoring of safety circuits General alarm function

5 pcs. SPST (5 A): AC-1: 5 A (ohmic)

5 pcs. SPST (5 A): AC-15: 2 (inductive)

1 pc. Solid State PWM for scroll -unload

Modbus for AK-SM 850

-20 – 60 °C, During operations

-40 – 70 °C, During transport

20 – 80 % Rh, not condensed

No shock inﬂuence/vibrations

max. 2.5 mm2 multi core

EU Low Voltage Directive and EMC demands re CE-marking complied with LVD tested acc. EN 60730-1 and EN 60730-2-9 EMC-tested acc. EN61000-6-2 and 3

Imax. = 0.5 A

Imin. = 50 mA

Leak<1.5 mA

Ordering

Typ e Description Code no.

AK-PC 351

24 V AC/20-60 V DC, LCD, RS485, 1SSR S

080G0289

Approvals EU Low Voltage Directive and EMC demands CE-marking complied with

LVD tested acc. EN 60730-1 and EN 60730-2-9 EMC-tested acc. EN61000-6-2 and 3.

Samples and related products For samples and related products, please contact your local Danfoss representative.

RD8CF122 / 520H9033