Danfoss ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C Data sheet

Data sheet

Colibri® Electric expansion valves

Type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

ETS Colibri® is an electric stepper motor valve. The valve has been designed for precise liquid injection into evaporators for air conditioning and refrigeration applications.

The valve in-line design includes balanced cage and slider assembly operated by the direct driven motor technology. This ensures solenoid tight shut-oﬀ in both ﬂow directions, thus providing smooth operation of the system.

The valve incorporates a powerful bi-polar motor which precisely controls ﬂow regulation. ETS Colibri® valves are compatible with electronic control solutions from Danfoss and other manufacturers.

Applications:

Air Conditioning

- Chillers, heat pumps

- Roof top and ducted split systems

- VRF and other split systems

- Close control cooling

Refrigeration

- Cold Rooms, Food retail and Transport

Features / Beneﬁts

Precise control of liquid injection

• Optimum utilization of the evaporator

• Increased energy eﬃciency and COP

• Improved overall system performance

Linear Flow characteristic

• Repetitive operation of the valve at all conditions

Balanced cage design

• Higher MOPD and MWP

• Easily ﬁts in various application and operating conditions

Direct driven valve motor technology

• Powerful motor that guarantees precise ﬂow control and increased energy eﬃciency of the system

Supports variety of refrigerants, approved for oil free applications

• Wide application scope

Fast opening/closing time of 2.5 seconds

• Quick reaction to the operating condition

• Minimizes the risk of liquid refrigerant ﬂowing into the compressor at shut down and low pressure cut out at start up

Solenoid tight shut-oﬀ

• Prevents migration of the refrigerant during stand-still

• Reduced complexity by reducing number of components in the system

Sight glass / moisture indicator

• Fast troubleshooting during system diagnostics

Compact, lightweight and in-line design

• Flexible and easy integration in any system

Bi-metal connectors

• Fast and improved brazing process - no wet wrap needed

Stainless construction

• Internal and external corrosion resistant

Fully hermetic laser welded design

• Hermetic valve in accordance to EU F-gas Regulation EU 517/2014

• No external leakage which saves cost on maintenance and refrigerant loss

• Protecting the environment and climate

Manufactured according to ISO/TS16949

• Second – to – none quality and reliability

For more info

DKRCC.PD.VD1.E7.02 | 1

Data sheet | Colibri® Electric expansion valves, type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

Application

Approvals: ETS Colibri®

Technical data

Electrical data

Electronic controller/ driver

ETS Colibri®

Condenser

Receiver

Evaporator

AKS temp. sensors and press. transmitters

Compressor

DML/DCL Filter drier

CE, REACH, UL, (Fluid Group l and ll , article 4 para 3), LLC CDC EURO TYSK, EAC

Applied for: ATEX II 3G Ex nA T6

Compatible refrigerants

R123zde, R1234yf, R1234ze(E), R1270, R134A, R152A, R22, R227, R23, R245fa, R290, R32, R404A, R407A, R407B, R407C, R407F, R407H, R410A, R412A, R413A, R417A, R422A, R422B, R422D, R427A, R438A, R442A, R444B, R447A, R448A, R449A, R449B, R450A, R452A, R452B, R454A, R454B, R454C, R455A, R463A, R502, R507, R512A, R513A, R513B, R515A, R515B, R516A, R600, R600A

Refrigerant oil POE, PVE, All mineral oils, ester oils and supports oil free Complies with PED Yes, Fluid group 1 and 2, article 4 paragraph 3 for all ETS Colibri MOPD 40 bar / 580 psi Max. working pressure PS/MWP 50 bar(g) / 725 psi(g) Refrigerant temperature range

(measured at the inlet of the valve)

-40 – 70 °C / -40 – 158 °F

Ambient temperature -40 – 70 °C / -40 – 158 °F Capacity control range 10% - 100% of total opening degree Initial opening Environmental transport/storage temperature and humidity

5% = 30 full steps

Max. +75 °C / +167 °F, Humidity: <100% RH

Material of construction Body: Stainless Steel / Connector: Bimetal (stainless steel and copper) Sightglass / moisture indicator Type N moisture indicator

Motor enclosure IP67 Stepper motor type Bi-polar - permanent magnet Step mode Microstepping (recommended), 2 phase full step or half step

Phase current

800 mA peak / 600 mA RMS. For more details on 3rd party controllers and lower phase current see section: Driving Colibri valve.

No permanent holding current needed. Max. 20% permanent holding current

Holding current

allowed with refrigerant ﬂow through valve For optimal performance, driver should keep 100% current on coils 10ms after last step

Phase resistance 10 Ω ±10% at +20 °C / +68 °F

Inductance 14 mH ±25%

Duty cycle

100% possible, requiring refrigerant ﬂow through valve Less than 50% over 120 sec period recommended

Nominal Power consumption 7.44 W RMS at 20 °C (total, both coils) Total number of full steps 600 Step rate Current control driver:

a. Step type: Microstep (1⁄4 th or higher): 240 full steps/sec. recommended b. Step type: Full step or Half steps: 240 full steps/sec. recommended Emergency close : 240 full steps/sec. OEMs with 3rd party controller, please contact Danfoss

Step translation 0.0167 mm / step Full travel time 2.5 at 240 steps / sec Opening stroke 10 mm / 0.4 in. Reference position Overdriving against the full close position

1% (6 full steps) Overdrive is recommended for optimum performance

Overdriving performance

628 steps in closing direction recommended for initialisation Overdriving in open position not recommended

Electrical connection according to EN 61076-2-101

Compatible controllers / driver Danfoss EKE 1A, EKE 1B, EKE 1C, MCX061V, MCX152V

Certain third party controllers / drivers. Contact Danfoss for details

Danfoss

R64-3010.11

DKRCC.PD.VD1.E7.02 | 2

34G230.10

Data sheet | Colibri® Electric expansion valves, type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

Ordering

Type

value

[m3/h]

R410A R407C R1234ze R134a R290 ODF × ODF (A × B)

value

[gpm]

[kW] [TR] [kW] [ TR] [kW] [TR] [kW] [ TR] [kW] [TR] [in] [mm]

Rated capacity1) Connection

Code no.

single pack

Code no.

I-pack

12 pcs.

Without sight glass

0.8 0.9 91.4 26.4 83.0 23.9 46.8 13.5 59.4 17.1 79.7 23.0 ½ × ½ - 034G7500 034G7510

ETS 12C

0.8 0.9 98.1 28.3 89.1 25.6 50.3 14.5 63.7 18.4 85.6 24.75/8 × 5/816 × 16 034G7501 034G7511

0.8 0.9 105 30.2 95.1 27.3 53.6 15.4 68.0 19.6 91.3 26.37/8 × 7/822 × 22 034G7502 034G7512

1.3 1.5 129 37.3 117 33.7 66.2 19.1 83.9 24.2 113 32.5 ½ × ½ – 034G7900 034G7910

ETS 24C

1.3 1.5 138 39.7 125 35.9 70.4 20.3 89.3 25.7 120 34.65/8 × 5/816 × 16 034G7901 034G7911

1.3 1.5 170 49.2 155 44.5 87.3 25.1 111 31.9 149 42.87/8 × 7/822 × 22 034G7902 034G7912

With sight glass

ETS 25C 1.3 1.5 170 49.2 155 44.5 87.3 25.1 111 31.9 149 42.87/8 × 7/822 × 22 034G7602 034G7612

2.4 2.8 323 93.3 294 84.5 166 47.7 210 60.5 282 81.37/8 × 7/822 × 22 034G7700 034G7710

ETS 50C

2.4 2.8 323 93.3 294 84.5 166 47.7 210 60.5 282 81.37/8 × 11/822 × 28 034G7701 034G7711

2.4 2.8 323 93.3 294 84.5 166 47.7 210 60.5 282 81.3 11/8 × 11/828 × 28 034G7702 034G7712

2.4 2.8 323 93.3 294 84.5 166 47.7 210 60.5 282 81.3 11/8 × 13/828 × 35 034G7703 034G7713

5.0 5.8 635 183 577 166 325 93.7 413 119 554 160 11/8 × 11/828 × 28 034G7800 034G7810

ETS 100C

5.0 5.8 635 183 577 166 325 93.7 413 119 554 160 11/8 × 13/828 × 35 034G7801 034G7811

5.0 5.8 635 183 577 166 325 93.7 413 119 554 160 1 3/8 × 1 3/835 × 35 034G7802 034G7812

5.0 5.8 635 183 577 166 325 93.7 413 119 554 160 1 5/8 × 1 5/8- 034G7803 034G7813

) The above estimated capacities, are based on the following conditions: Evaporating temperature te : 5 °C / 40 °F Liquid temperature tl : 28 °C / 82 °F Condensing temperature tc : 32 °C / 90 °F Full stroke opening in normal ﬂow direction Capacity is ± 10% in full open state in reverse ﬂow direction

Identiﬁcation

(laser engraved data)

Coolselector®2

is a Danfoss calculation and selection software, designed to make selection processes for all refrigeration projects easier and less time consuming.

For fast and precise selection of valve, use Danfoss’ CoolSelector2® software. You can download it from http://coolselector.danfoss.com

Made in Denmark : Country of origin

Colibri® Electric Expansion valve : Valve name ETS XXXC : Valve type

N0317A (Manufacturing no.) : N = Nordborg, Denmark 03 = week 17 = 2017 A = Monday 10 Ω, 800 mA peak : Motor resistense, current PS 50 bar / MWP 725 psig : Max. working pressure

-40/+70 °C / -40/+158 °F : Refrigerant temperature 034GXXXX : Code number : Approvals

089

: QR code (with traceable serial no.)

Danfoss, 6430 Nordborg, Denmark : Manufacturer address

MADE IN DENMARK

Colibri® Electric Expansion valve

ETS XXXC

N0317A 10 Ω, 800mA peak PS 50bar / MWP 725psig

-40/+70°C / -40/+158°F

034GXXXX

089

Danfoss, 6430 Nordborg, Denmark

GREEN: DRY

MADE IN DENMARK

Colibri® Electric Expansion valve

ETS XXXC

N0317A 10 Ω, 800mA peak PS 50bar / MWP 735psig

-40/+70°C / -40/+158°F

034GXXXX

GREEN: DRY

YELLOW: WET

NormalReverse

Danfoss

Reverse Normal

Valid for ETS 25C, ETS 50C, ETS 100C

DKRCC.PD.VD1.E7.02 | 3

Data sheet | Colibri® Electric expansion valves, type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

Accessories: M12 angle cable

Approvals for cable

Speciﬁcation

M12 angle female connector is intended for use with a standard M12 male connector, available on stepper motor valves. This cable is designed to oﬀer high ﬂexibility and small outer diameters with tensile strength. The angle way M12 cable consist of paired, twisted wires, which decreases mutual inﬂuence between signals transmitted along the cable and reduces inﬂuence of external sources of interference. The cables thus provides a higher degree of protection against lost steps compared to other cables.

RoHS

Jacket PVC - black

Cable outer sheath Oil - resistant

Water proof rating IP 67

Operating temperature range -40 – 80 °C

Wire type Twisted pair, cross section 20 AWG / 0.5 mm2

Cable outer diameter 7.0 mm

Minimum bending radius 10 x cable diameter

Cable combustibility / test Flame retardant / VW-1 / CSA FT - 1

M12 standard EN 61076-2-101

Reference standard UL style 2464 and DIN VDE 0812

LVD directive 2014/35/EU

Ordering

Identiﬁcation

Connections

Cable Cable length (L) Insulation Packing format Code no.

PVC - black

A2 black

A1 white

2 + 0.089 m / 6.6 + 0.3 ft SR-PVC Single pack 034G7073 8 + 0.3 m / 26.2 +1 ft SR-PVC Single pack 034G7074

Product type Code no

Manufacturing date

Meters / Feets

Country

B1 red

B2 green

34G210.10

34G211.10

Dimensions

34G209.10

Ø 63 mm / 1/4 inch

2 + 0.089 meters / 6.6 + 0.3 feet 8 + 0.3 meters / 26.2 +1 feet

35 mm / 1.4 inch 49 mm / 1.9 inch

DKRCC.PD.VD1.E7.02 | 4

Data sheet | Colibri® Electric expansion valves, type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

Design and function

The ETS Colibri® in-line electronic expansion valve regulates refrigerant ﬂow by means of an internal cage slider which moves in a linear motion. This occurs by the rotation of a spindle assembly which moves when electrical pulses are applied to the motor. The direction of the rotation of the spindle depends on the phase relationship of the power pulses.

Cable length

Depending on the type of controller or driver, there will be limitations in cable length between the controller / driver and the valve. Both the actual cable length, the level of EMC emission on the location and the driver circuit have an impact on the actual distortion of the current to the motor. On using 3rd party longer cable, make sure that the valve receives the exact current as deﬁned in the speciﬁcation.

1. Valve body in stainless steel

2. Connections in bi-metal

3. Sight glass with moisture indicator

4. M12 electrical connection

5. Stepper motor

6. Cage and slider

The valve design is pressure balanced, giving identical bi-ﬂow performance capabilities and nearly identical maximum capacities. Operating the ETS Colibri® series requires a controller that can provide 800mA peak/ 600mA RMS current per phase in order to achieve the operational temperature and MOPD envelope of the valve.

4 3

Flow direction

Valve design

Valve opening position

(Valid for ETS 25C - ETS 100C)

Flow direction from A to B refers the normal ﬂow. Sightglass for ﬂash gas detection can only be used in normal ﬂow direction.

Sight glass and indicator

ETS 25C, ETS 50C and ETS 100C have integrated sight glass with moisture indicator. The presence of the sight glass provides the availability to check the physical position of the slider in the valve. It also helps to determine the ﬂow direction of the refrigerant in the system. Insuﬃcient sub cooling can produce ﬂash gas which is visible through the sight glass. The moisture indicator in the sight glass indicates dry or wet state of the refrigerant by changing colour.

0% open 25% open 50% open 100% open75% open

Moisture indicator

Green = dry

Yellow = wet

The colors of the grooves are only for illustration purposes

DKRCC.PD.VD1.E7.02 | 5

Data sheet | Colibri® Electric expansion valves, type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

Flow curve

ETS Colibri. Capacity Vs Opening %

ETS Colibri Capacity Vs Opening %

450

400

Fully open

Partially open

Fully closed

350

300

250

200

Capacity [KW]

150

100

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Opening Degree [%]

Danfoss 34G161.20

For R134a

The above estimated capacities, are based on the following conditions:

- Evaporating temperature te : 5 °C / 40 °F

- Liquid temperature tl : 28 °C / 82 °F

- Condensing temperature tc : 32 °C / 90 °F Full stroke opening in normal ﬂow direction. Capacity is ± 10% in full open state in reverse ﬂow direction.

ETS 12C ETS 24C, ETS 25C ETS 50C ETS 100C

7/8 x 7/8 in 7/8 x 7/8 in

Opening degree [%]

Driving Colibri® valve with 3rd party controller

ETS Colibri valves use a bipolar, 2-phase, permanent magnet stepper motor. ETS valves can be driven using various electronic control techniques i.e: Full step excitation mode, half step excitation mode, micro stepping mode (recommended). On selecting controller from other manufacturer than Danfoss, it is necessary to set the following correct valve data into the controller setting. The wrong settings may impair the performance of the valve.

a. Total no. of steps - 600 full steps (or equivalent steps based on excitation mode, e.g 1 full step = 2

half steps)

b. Step rate

For current control driver: Step type: Microstep (1⁄4 th or higher): 240 full steps/sec. recommended Step type: Full step or Half steps: 240 full steps/sec. recommended Emergency close : 240 full steps/sec.

c. Phase current

Always use full current of 600 mA RMS (800mA Peak) for driving ETS Colibri when possible. For application that requires lower MOPD or moderate operating temperatures, it is possible to drive ETS Colibri with low driving current . See below guideline for details.

d. Overdriving against closing position

1% (i.e 6 full steps) Overdrive is recommended for optimum performance initialization during startup, 628 steps in closing direction recommended for initialization Overdriving in open position is not allowed.

e. Holding current

No permanent holding current needed. Max. 20% permanent holding current allowed with refrigerant ﬂow through valve For optimal performance, driver should keep 100% current on coils 10ms after last step For controllers with limited driving current, it will be good to have some holding current.

ETS Colibri guideline for using low current in 3rd party controllers, for low operating conditions.

MOPD

Evaporting

temperature

Bar Psig (°C) (°F) (°C) (°F)

Condensing

temperature

Current rating

RMS (mA)

Peak (mA)

AC (Cooling only) 30 435 0 32 60 140 250 353

Reversible Chiller 30 435 -20 -4 50 122 300 423

Heat Pump 40 580 -30 -22 65 149 375 530

Refrigeration 30 435 -30 -22 60 140 300 423

* Operating conditions stated above are evaluated on refrigerants like R32/R410A for Chiller/Heat pump and R448A/R449A for Refrigeration.

DKRCC.PD.VD1.E7.02 | 6

Data sheet | Colibri® Electric expansion valves, type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

Important notes:

1. It is always best to use the highest possible current achievable in the controller while going below standard phase current.

2. Use lower speed rates to achieve higher torque while lowering the Phase current.

3. Customer must evaluate the performance of the system while using ETS Colibri with lower phase current and with 3rd party controllers.

4. All qualiﬁcation testing of performance, robustness and reliability of Colibri has been conducted on 600mA RMS capable current drivers.

If the controller driving the ETS Colibri valve is from another manufacturer than Danfoss or a custom design, the following points must be considered in order to overcome potential step loss.

To ensure total closing of the valve, and to compensate the lost steps after a deﬁned number of changes in opening degree the controller should have a function to overdrive the valve in the closing direction. It is recommended to overdrive the valve at appropriate intervals as speciﬁed in the speciﬁcation table.

At power failure the ETS valve will remain in the actual opening position it has at the moment of power failure, unless a device in the form of a battery backup to the controller is installed.

Stepper motor switch sequence

The following table shows the full step excitation switching sequence

Pin A 1 A 2 B 1 B 2

Wire color

STEP

CLOSING

Color code is only valid for Danfoss M12 cable

1 + - + 2 + - - + 3 - + - + 4 - + + 1 + - + -

Coil A Coil B

White Black Red Green

OPENING

Electrical check of stepper motor and wiring: coil A and coil B = 10 Ω at 20 °C / 68 °F

M12 connector

Danfoss

34G152.10

DKRCC.PD.VD1.E7.02 | 7

A1 B1

excited excited excited excited

Stator

Plain view

Enlarged view

Rotor

Stepper motor

A1 B2 A2 B2 A2 B1

Danfoss

R64-2110.11

Rotor

Opening

Closing

Data sheet | Colibri® Electric expansion valves, type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

Operation principle

This section explains the operation of the two phase full step excitation method in a bipolar stepper motor. Fig. 1 shows the simpliﬁed diagram of a rotor and a stator. The Full stepping operation is summarized below. When a current in a form of a pulse ﬂows to a given phase, that phase of the stator is excited as shown in Fig. 2.

1. On exciting Phases B1 and A1 simultaneously, the permanent magnets on the rotor are moved in the intermediate position between phase B1 and phase A1

2. When phases A1 and B2 are excited simultaneously, the rotor is then positioned between phases A1 and B2

3. Next, by exciting the successive adjacent pairs of phases sequentially i.e phases B2 and A2, phases A2 and B1, and phases B1 and A1, the rotor rotates through two phase excitations

4. By completely reversing the cycle in the following sequence phases B1 and A1 to phases A2 and B1 to phases B2 and A2 to phases A1 and B2, the stepper motor then reverses its rotation

5. The stepper motor is stopped by holding the phase excitation for a speciﬁed period at the last phase of forward or reverse rotation

Fig. 1.

Fig. 2.

Two phase full step excitation

ETS Colibri valves can also be driven by micro stepping excitation method (preferred) in addition to the one explained above.

DKRCC.PD.VD1.E7.02 | 8

Data sheet | Colibri® Electric expansion valves, type ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C

Dimensions ETS 12C / ETS 24C

Connections

Typ e

ODF x ODF (A x B)

[in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in]

/2 x 1/

ETS 12C

ETS 24C

*) For the equivalent industrial p acked code number see the ordering sec tion

/8 x 5/

/8 x 7/

/2 x 1/

/8 x 5/

/8 x 7/

ØD1 L1 L2 L3 min L4 min H1 H2

49.9 2 122 4.8 41.6 1.6 9.5 0.3 9.5 0.3 65.6 2.6 40.7 1.6 034G7500

49.9 2 132 5.2 46.6 1.8 14.7 0.6 14.7 0.6 65.6 2.6 40.7 1.6 034G7501

49.9 2 135 5.3 48.4 1.9 20.0 0.8 20.0 0.8 65.6 2.6 40.7 1.6 034G7502

49.9 2 122 4.8 41.6 1.6 9.5 0.3 9.5 0.3 65.6 2.6 40.7 1.6 034G7900

49.9 2 132 5.2 46.6 1.8 14.7 0.6 14.7 0.6 65.6 2.6 40.7 1.6 034G7901

49.9 2 135 5.3 48.4 1.9 20.0 0.8 20.0 0.8 65.6 2.6 40.7 1.6 034G7902

MADE IN DENMARK

ØD1

Colibri® Electric Expansion valve

ETS XXXC

N0317A 10 Ω, 800mA peak PS 50bar / MWP 735psig

-40/+70°C / -40/+158°F

034GXXXX

NormalReverse

L3 L3

Danfoss

34G156.12

Danfoss 34G223.20

Code no. *)

ETS 25C, ETS 50C and ETS 100C

ØD1

Connections

Typ e

ODF x ODF (A x B)

[in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [kg]

ETS 25C

ETS 50C

ETS 100C

*) For the equivalent industrial p acked code number see the ordering sec tion

/8 x 7/

/8 x 1 1/ 1 1/8 x 1 1/ 1 1/8 x 1 3/ 1 1/8 x 1 1/ 1 1/8 x 1 3/ 1 3/8 x 1 3/ 1 5/8 x 1 5/

ØD1 L1 L2 L3 min L4 min H1 H2

49.9 2 135 5.3 48.4 1.9 20 0.8 20 0.8 65.6 2.6 40.7 1.6 0.31 034G7602

49.9 2 135 5.3 48.4 1.9 20 0.8 20 0.8 65.6 2.6 40.7 1.6 0.31 034G7700

49.9 2 137 5.4 48.4 1.9 20 0.8 20 0.8 65.6 2.6 40.7 1.6 0.32 034G7701

49.9 2 139 5.5 50.4 2 20 0.8 20 0.8 65.6 2.6 40.7 1.6 0.32 034G7702

49.9 2 147 5.8 50.4 2 20 0.8 25 1.0 65.6 2.6 40.7 1.6 0.33 034G7703

49.9 2 139 5.5 50.4 2 20 0.8 20 0.8 65.6 2.6 40.7 1.6 0.32 034G7800

49.9 2 147 5.8 50.4 2 20 0.8 25 1.0 65.6 2.6 40.7 1.6 0.33 034G7801

49.9 2 155 6.1 58.4 2.3 25 1.0 25 1.0 65.6 2.6 40.7 1.6 0.35 034G7802

49.9 2 169 6.7 65.4 2.3 30 1.2 30 1.2 65.6 2.6 40.7 1.6 0.37 034G7803

GREEN: DRY

MADE IN DENMARK

Colibri® Electric Expansion valve

ETS XXXC

N0317A 10 Ω, 800mA peak PS 50bar / MWP 735psig

-40/+70°C / -40/+158°F

034GXXXX

YELLOW: WET

NormalReverse

L3 L3

Danfoss 34G222.20

Net

weight

Code no. *)

DKRCC.PD.VD1.E7.02 | 9

Troubleshooting

Symptom Possible Cause Remedy

Lack of proper electrical connection • Check the connection between valve and a controller

• Check valve settings in controller i.e pre-selected valves, no. of steps, phase current, direction of valve rotation, steps per second

• Check the resistance between coil A and coil B. Resistance in each coil should be 10 ohms @20°C. Details on page 4

• Replace a complete valve

• Separate the cable from high power lines

• Check the maximum cable length allowed between the controller and the valve

• For longer cable distance, use cable with bigger wire diameter

• Use cable ﬁlter

• Controller should overdrive the valve to compensate the lost steps after a number of changes in opening degree

• Check the current/voltage supply from controller to valve

• Check the supply power to controller

• Check refrigeration system capacity and compare with expansion valve capacity. Replace with larger valve if necessary

• Check superheat performance, the settings SH min and SH max. in the super heat controller

• Check valve capacity

• Check ‘total number of steps’ deﬁned in the controller

• Also check section ‘High Superheat’

• Check refrigerant

• Also refer to section Insuﬃcient capacity

• Check the controller superheat settings and sensors connected to it

• Tune PID parameters in the controller

• Check refrigerant for ﬂash gas ahead of expansion valve / external subcooler

• If the valve is placed much higher than condenser outlet, check pressure diﬀerence

• Limit max opening degree of the valve setting in controller

• Check refrigeration system capacity and compare with expansion valve capacity. Use proper valve size suitable for the system

No valve movement

Internal leakage (due to ‘Step Loss’)

Insuﬃcient capacity

High superheat

Flash gas

Wrong parameter setting in controller

Broken motor/ short circuit

Insuﬃcient power supply to valve • Check the current/voltage supply from controller to valve Control pulse to valve is inﬂuenced by high

external electrical noise

Longer cable length between valve and controller

Accumulated backlash in valve

Insuﬃcient power supply to the valve

Expansion valve too small

Suction pressure too low Evaporator superheat too high

Expansion valve blocked with foreign material • Remove and examine the valve Evaporator wholly or partly iced up • De-ice evaporator

Lack of sub-cooling

Controller is not setup/tuned properly

Lack of sub-cooling ahead of expansion valve

Oversized valve selected

Danfoss ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual