NRG Systems IceFree3 User Manual

NRG IceFree3™ Vane

NRG Turbine Control Vane

User Manual

NRG Systems, Inc. • 110 Riggs Road • Hinesburg • VT 05461 USA

TEL [phone] • FAX [phone] • EMAIL [e-mail]

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 0

Specifications are subject to change without notice.

© NRG Systems, Inc.

PO Box 509

Hinesburg VT 05461

Tel: [phone]

Fax: [phone]

e-mail: [e-mail]

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 1

Table of Contents

Customer Support .................................................................................................................... 3

Introduction .............................................................................................................................. 4

Sensor Identification and Quick ID Table ............................................................................... 5

General Sensor Information .................................................................................................... 7

NRG IceFree3™ Yaw Vane 4ch, NPN ..................................................................................... 8

NRG IceFree3™ Yaw Vane 1ch, PNP .................................................................................... 14

NRG IceFree3™ Yaw Vane 2ch, PNP .................................................................................... 19

NRG Turbine Control Yaw Vane ............................................................................................ 24

Warranty & Repair ................................................................ .................................................. 28

Return Instructions ................................................................................................................ 29

Declaration of Conformity ..................................................................................................... 30

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Customer Support

NRG Systems offers a variety of support options to help you get the most from your NRG
product. If you have questions about your NRG product, first look in the printed product
documentation, the Knowledge Base, or in the Technical Forum in the Tech Support section of

NRG’s web site. If you cannot find the answer, contact your salesperson or NRG Systems

Customer Support for assistance using the information below. Customer support is available
8:30 AM to 5:00 PM EST, Monday through Friday.

NRG Systems, Inc. Telephone: [phone]

110 Riggs Road Toll Free (USA only): 800-448-WIND (800-448-9463)
Hinesburg, Vermont FAX: [phone]
05461 U.S.A. Email: [e-mail]

When you call or email, you should have the appropriate product documentation at hand and
be prepared to give the following information:

 Customer name
 Who purchased equipment
 Item number or description
 Serial number
 When equipment was purchased
 Where equipment is installed - terrain conditions
 Description of the problem with some detail
 What events took place leading up to the problem
 What you have tried while attempting to solve the problem

NRG Systems maintains an extensive website which includes an in-depth customer support
area for NRG customers. If you need assistance at times other than our regular business
hours, we suggest visiting our website, www.nrgsystems.com.

All instruments, sensors, software and towers manufactured by NRG Systems are designed to
be reliable and easy to use. We welcome your comments and appreciate your help in making
NRG products the best available.

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Introduction

NRG IceFree3™ Vane (Heated)

The NRG IceFree3™ yaw vane is an electrically-heated wind direction sensor designed for wind turbine control at
ice-prone sites. The vane base is fixed to the turbine nacelle, with relative “north” facing directly toward the
blades. Rotation of the vane indicates yaw errors and provides output signals relative to the fixed vane base.

The IceFree3™ is reliable in heavy and light winds. It is rugged enough to accurately measure winds in excess of
90 meters per second (200 miles per hour), yet its low moment of inertia allows it to respond to winds as low as

2.0 m/s.

NRG Turbine Control Vane (Unheated)

The NRG Turbine Control yaw vane is a rugged wind direction sensor designed specifically for wind turbine

control. The vane base is fixed to the turbine nacelle with relative “north” facing directly out toward the blades.

Rotation of the vane head interrupts optical sensors and indicates yaw errors by providing output signals relative
to the fixed vane base.

The NRG Turbine Control yaw vane is reliable in heavy and light winds. It is rugged enough to accurately
measure winds in excess of 90 meters per second (200 miles per hour), yet its low moment of inertia allows it to
respond to winds as low as 2.0 m/s.

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Product

Kit#

FG#

Description

See Page

NRG IceFree3™ Yaw Vane

4 Ch, NPN, 2.8 m

#2451

#2443

 Heated yaw error vane
 Four NPN outputs
 2.8m cable

8

NRG IceFree3™ Yaw Vane

4 Ch, NPN, 4.7 m

#4107

#4102

 Heated yaw error vane
 Four NPN outputs
 4.7m cable

8

NRG IceFree3™ Yaw Vane

4 Ch, NPN, 8.0 m

#2652

#2650

 Heated yaw error vane
 Four NPN outputs
 8.0m cable

8

Sensor Identification

Serial Number

The serial number is etched into the base of the sensor.

Finished Good (FG) vs. Kit Numbers

Finished Good (FG) numbers are used to refer to the sensor itself. A Kit number always includes the FG number,
but may include item accessories as well. Always use the Kit # when placing an order.

Quick ID: NRG IceFree3™ Vanes (Heated)

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NRG IceFree3™ Yaw Vane

4 Ch, NPN, 8.0 m, M8

#3292

#3291

 Heated yaw error vane
 Four NPN outputs
 8.0m cable
 8mm Mounting Screw

8

NRG IceFree3™ Yaw Vane

4 Ch, NPN, 10.0 m

#3450

#3448

 Heated yaw error vane
 Four NPN outputs
 10.0m cable

8

NRG IceFree3™ Yaw Vane

4 Ch, NPN, 17.0 m

#2850

#2848

 Heated yaw error vane
 Four NPN outputs
 17.0m cable

8

NRG IceFree3™ Yaw Vane

1 Ch, PNP, 2.8 m

#2808

#2807

 Heated yaw error vane
 One PNP output
 2.8m cable

14

NRG IceFree3™ Yaw Vane

1 Ch, PNP, 4.6 m

#3059

#3057

 Heated yaw error vane
 One PNP output
 4.6m cable

14

NRG IceFree3™ Yaw Vane

2 Ch, PNP, 8.0 m

#3482

#3480

 Heated yaw control vane
 Two PNP outputs
 8.0m cable

19

Product

Kit#

FG#

Description

See Page

NRG Turbine Control

Yaw Vane

2 Ch, PNP, 8.0 m

#3581

#3579

 Yaw error vane
 Two PNP outputs
 8.0m cable
 Unheated sensor

24

Quick ID: NRG Turbine Control Vane (Unheated)

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General Sensor Information

ESD, Circuit Protection, and Cautions

 Do not apply greater than 30 Volts to the outputs at any time.
 We suggest that you not mount the sensor until the proper grounding is available. When you mount the

sensor, protect the signal wires and connect the ground first. After connecting to ground, attach the
signal wires from the sensor.

 There are internal TVS diodes on the output. If the output voltage is pulled above 30 V, or below ground,

the diode will clamp the output to ground.

 Do not apply constant reverse voltages to the outputs. The internal diode is intended only to protect the

sensor output from transient reverse voltages, for example, the inductive turn-off spike caused by driving
reed-relay coils directly from the output.

Heater Operation

The heat source for the IceFree3 is a self-regulating constant-temperature heater. In severe wind and icing
conditions, the IceFree3 draws full power and remains clear of ice. As weather conditions improve, the IceFree3
draws less power. The IceFree3’s self-regulating feature increases its reliability, insuring that the head does not
reach excessive temperatures. The IceFree3 heater is powered by 24 volt power, AC or DC, making it compatible
with a wide range of remote site equipment. An optional 120/240V - 24 VAC transformer is also available.

 Following a brief inrush current, the heater quickly settles into its temperature-controlled mode.

 It is recommended that a 15 A slow-blow fuse be placed in line with the heater.

Installation

1. Tape the ends of the cables to prepare them for feeding through the mounting boom. Maintain the isolation of
the signal leads from the boom. Remove the nut and bolt from the base of the unit. Feed the cables through the
mounting boom until the sensor is on the boom. Align the bolt hole in the base (not the slot) with the hole in the
boom such that the hole in the base points forward toward the rotor blades.

2. Check to be sure that the sensor is secure against the top of the boom. Insert the bolt into the slot side of the
base. Place the nut on the end of the bolt and tighten.

3. Using the notations on the individual wires, connect the ground (common) lead to your controller first. Then
connect the signal leads. Connect power last, especially if power is on during connection. Confirm input on
controller.

4. Connect the heater power cable to your power source and check to be sure that the sensor head is heating.
You do not need to wait until the body gets hot to be sure the heaters are working. Any warmth at the top of the
stem (near the head) means that the heaters are working. The lower housing will take longer to warm up and
will not get as hot.

IceFree sensors should be heated year-round to maintain constant bearing temperatures and to prevent
moisture or condensation internally. We do not recommend turning off the heaters, even in warm
weather.

*Calibration

If the IceFree sensor has been calibrated, a sensor specific calibration report has been shipped with the sensor.
If the calibration report should get lost, you may contact NRG for a copy. Please note that you will need the
sensor serial number when you contact NRG.

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Sensor Maintenance

The bearings used in the IceFree3 sensors will last a minimum of 2 years. Sensor bearing life is variable and
depends upon the amount of exposure to salinity, dust, moisture, icing, vibration, and other environmental
factors. These factors independently, or in combination with each other, may reduce the bearing life. Routine
maintenance should be considered at 2 year intervals.

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NRG IceFree3™ Yaw Vane

NPN Output Circuit Operation

The IceFree3™ yaw vane has four output signals, each centered on one of the four cardinal directions. The

outputs are open-collector type; they sink current to signal ground when active and are high impedance when
inactive.

Typically, these outputs are used with a pull up resistor from the output to the desired power supply, and then the
output is connected to a digital input on the controller. The active outputs are pulled low by the sensor, and when
the output is inactive, the signal is pulled high by the resistor to the supply voltage. This open-collector
arrangement allows you to choose the signal high voltage independently of the power input supply. The outputs
can also directly drive current loop inputs such as reed-relay coils or opto-isolated inputs, if the approximately 4
mA output drive capability is sufficient.

The opto-interrupters require an external power supply to operate the LED lamps. The sensor signals are
powered through an additional two wires: the red (excitation) and black (ground) wires.

4 Ch, NPN

Kit# 2451, 4107, 2652, 3292, 3450, 2850
FG# 2443, 4102, 2650, 3291, 3448, 2848

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Interpreting Output Signals – 4 Channels

The diagrams and table below indicate when each of the four outputs is active (1) or inactive (0) for each relative
direction the nose is pointing. For example, if the vane nose is pointing 55 degrees relative to the base, the VR
output (blue wire) and VR90 output (orange wire) will become active.

Output Signals

Azimuth Range

(clockwise

degrees)

VR

VL

VR90

VL90

5 to 175

1 0 0

0

185 to 355

0 1 0

0

95 to 265

0 0 0

1

275 to 85

0 0 1

0

Output Signal

Wire Color

VR

Blue

VL

Green

VL90

White

VR90

Orange

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[ Kit# 2451, 4107, 2652, 3450, 2850 ]
[ FG# 2443, 4102, 2650, 3448, 2848 ]
Sensor and Mounting Outline

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[ Kit# 3292, FG#3291 ] M8 Sensor and Mounting Outline

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Description
Sensor type

heated yaw error vane

Applications

wind turbine yaw control

Sensor range

mechanical range 360°

Output signal
Signal type

 four NPN outputs, open-collector, active outputs sink current
 can sink 4.0 mA at approximately 0.75 V drop; can sink 1.8 mA

at approximately 0.4 V drop

Transfer function

4 outputs, switch 5 degrees each side of relative north, south,
east, and west

Accuracy

+/- 3 deg

Power requirements

Supply voltage

8 V to 24 V DC

Supply current

30 mA typical; sensor power draw is internally regulated

Heater supply voltage

 24 V AC/DC
 optional transformer available

Heater supply current

 Inrush: 8 A maximum
 Steady state: 1 A at 20 °C (68 °F), 4 A under maximum thermal

load (head frozen in clear ice then powered on)

Response
characteristics

Threshold

<2 m/s

Installation
Mounting

mounts to a 27 mm (1.05 inch) diameter (3/4 inch IPS) pipe with a
5/16 inch nut and bolt(*FG#3291 uses M8 bolt); cabling exits into
mounting pipe

Tools required

13 mm (0.5 inch) nut driver

Environmental
Operating temperature

range

-40 °C to 60 °C (-40 °F to 140 °F)

Operating humidity
range

0 to 100% RH

Physical

Connections

Sensor Cable

 red: power
 black: ground
 blue: VR
 green: VL
 orange: VR90
 white: VL90

Heater Cable
 black/white: heater power (AC/DC)

Cable length

Signal and power cables: See Quick ID Table

Weight

1.23 kg (2.7 pounds) not including cable

Dimensions

 overall assembly height: 239 mm (9.41 inches)
 body diameter: 70 mm (2.75 inches)
 swept diameter: 212 mm (8.38 inches)
 center to tail radius: 106 mm (4.19 inches)

Materials

Body

cast aluminum with black anodized finish and heat-resistant black
paint

[ Kit# 2451, 4107, 2652, 3292, 3450, 2850 ]
[ FG# 2443, 4102, 2650, 3291, 3448, 2848 ]

Specifications

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Shaft

centerless ground, stainless steel

Bearing

 upper: sealed, stainless steel, ball bearing with application
specific lubrication
 lower: modified teflon bearing

Wing

precision balanced aluminum with black anodized finish and heat­resistant black paint

Cable

 Signal: 6 conductor 22 AWG, Teflon jacket with braid shield and
drain, 3.6 m (12 feet) long
 Heater: 2 conductor 20 AWG, Teflon jacket with braid shield
and drain

Enclosure

 sealed to IP55
 heater is epoxy encapsulated to IP65
 sensor electronics epoxy encapsulated to IP65

Signal generator

epoxy encapsulated inside glass reinforced thermoplastic shell

Heater

fully encapsulated, self-regulating

Base

cast aluminum with black anodized finish and heat-resistant black
paint

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PNP Output Circuit Operation

The IceFree3™ Yaw Error sensor has one output signal. The output is “PNP”, which means an active output

sources current from the sensor supply to the load on the output.
Typically, the output is used by connecting the output to a grounded load such as a relay or optical isolator in the

turbine controller. The active output powers the relay coil or opto-isolator loop, and when the output is inactive,
the load is off.

The opto-interrupters require an external power supply to operate the LED lamps. The sensor signals are
powered through an additional two wires: the red (excitation) and black (ground) wires.

NRG IceFree3™ Yaw Vane
1 Ch, PNP

Kit# 2808, 3059
FG# 2807, 3057

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Interpreting Output Signals – 1 Channel

The diagrams and table below indicate when the output is active (1) or inactive (0), for each relative direction the
nose is pointing. For example, if the vane nose is pointing 205 degrees relative to the base, the VR output (blue
wire) will become active.

Output Signal

Azimuth Range

(clockwise

degrees)

VR

190 to 360

1

Output Signal

Wire Color

VR

Blue

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[Kit# 2808, 3059]
[FG# 2807, 3057]
Sensor and Mounting Outline

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 17

Description
Sensor type

heated yaw error vane

Applications

wind turbine yaw control

Sensor range

mechanical range 360°

Output signal
Signal type

 one PNP output, active output sources current from the sensor
power supply

 can source up to 25 mA to within 1 V of the supply voltage
 inactive output leakage is less than 100 uA

Transfer function

output switches 5 degrees each side of relative north

Accuracy

+/- 3 deg

Power requirements

Supply voltage

8 VDC to 24 VDC

Supply current

30 mA typical; sensor power draw is internally regulated

Heater supply voltage

 24 V AC/DC
 optional transformer available

Heater supply current

 Inrush: 8 A maximum
 Steady state: 1 A at 20 °C (68 °F), 4 A under maximum thermal

load (head frozen in clear ice then powered on)

Response
characteristics

Threshold

<2 m/s

Installation
Mounting

mounts to a 27 mm (1.05 inch) diameter (3/4 inch IPS) pipe with a
5/16 inch nut and bolt; cabling exits into mounting pipe

Tools required

13 mm (0.5 inch) nut driver

Environmental
Operating temperature

range

-40 °C to 60 °C (-40 °F to 140 °F)

Operating humidity
range

0 to 100% RH

Physical

Connections

Sensor Cable

 red: power
 black: ground
 blue: VR

Heater Cable
 black/white: heater power (AC/DC)

Cable length

Signal and heater cables: See Quick ID Table

Weight

1.23 kg (2.7 pounds) not including cable

Dimensions

 overall assembly height: 239 mm (9.41 inches)
 body diameter: 70 mm (2.75 inches)
 swept diameter: 212 mm (8.38 inches)
 center to tail radius: 106 mm (4.19 inches)

Materials
Body

cast aluminum with black anodized finish and heat-resistant black
paint

Shaft

centerless ground, stainless steel

[Kit# 2808, 3059]
[FG# 2807, 3057] Specifications

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Bearing

 upper: sealed, stainless steel, ball bearing with application
specific lubrication
 lower: modified teflon bearing

Wing

precision balanced aluminum with black anodized finish and heat­resistant black paint

Cable

 Signal: 3 conductor 22 AWG, Teflon jacket with braid shield and
drain,
 Heater: 2 conductor 20 AWG, Teflon jacket with braid shield
and drain

Enclosure

 sealed to IP55
 heater is epoxy encapsulated to IP65
 sensor electronics epoxy encapsulated to IP65

Signal generator

epoxy encapsulated inside glass reinforced thermoplastic shell

Heater

fully encapsulated, self-regulating

Base

cast aluminum with black anodized finish and heat-resistant black
paint

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 19

PNP Output Circuit Operation

The IceFree3™ Yaw Error sensor has one output signal. The output is “PNP”, which means an active output

sources current from the sensor supply to the load on the output.
Typically, the output is used by connecting the output to a grounded load such as a relay or optical isolator in the

turbine controller. The active output powers the relay coil or opto-isolator loop, and when the output is inactive,
the load is off.

The opto-interrupters require an external power supply to operate the LED lamps. The sensor signals are
powered through an additional two wires: the red (excitation) and black (ground) wires.

NRG IceFree3™ Yaw Vane
2 Ch, PNP

Kit# 3482
FG# 3480

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 20

Interpreting Output Signals – 2 Channels

The diagrams and table below indicate when each of the two outputs is active (1) or inactive (0), for each relative
direction the nose is pointing. For example, if the vane nose is pointing 35 degrees relative to the base, the V90
output (green wire) will become active.

Output Signals

Azimuth Range

(clockwise

degrees)

V90

V0

0 to 90

1

0

90 to 190

0

0

190 to 280

0

1

280 to 0

1

1

Output Signal

Wire Color

V90

Green

V0

White

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[ Kit# 3482, FG#3480 ] Sensor and Mounting Outline

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 22

Description

Sensor type

heated yaw control vane

Applications

wind turbine yaw control

Sensor range

mechanical range 360°

Instrument
compatibility

digital inputs of turbine controllers and PLCs

Output signal
Signal type

 PNP outputs: active high output sources current to the sensor
output load from the sensor power supply; inactive low output is
pulled down to ground by sensor output load
 each output can source up to 25 mA to within 1 V of the supply
voltage
 inactive output leakage is less than 100 uA

Transfer function

2 outputs; switch points at relative wind 0°, 90°, 190°, 280°

Accuracy

+/- 3 deg

Power requirements

Supply voltage

8 VDC to 24 VDC

Supply current

30 mA typical; sensor power draw is internally regulated

Heater supply
voltage

 24 V AC/DC
 optional transformer available

Heater supply
current

 Inrush: 8 A maximum
 Steady state: 1 A at 20 °C (68 °F), 4 A under maximum thermal

load (head frozen in clear ice then powered on)

Response
characteristics

Threshold

<2 m/s

Installation
Mounting

mounts to a 27 mm (1.05 inch) diameter pipe (3/4 inch pipe size) with
a 5/16 inch nut and bolt; cabling exits into mounting pipe

Tools required

13 mm (0.5 inch) nut driver

Environmental
Operating

temperature range

-40 °C to 60 °C (-40 °F to 140 °F)

Operating humidity
range

0 to 100% RH

Physical

Connections

Sensor Cable

 red: power
 black: ground
 white: V0
 green: V90

Heater Cable
 black/white: heater power (AC/DC)

Cable length

Signal and heater cables: 8.0 m (26.2 feet)

Weight

1.23 kg (2.7 pounds) not including cable

Dimensions

 overall assembly height: 239 mm (9.41 inches)
 body diameter: 70 mm (2.75 inches)
 swept diameter: 212 mm (8.38 inches)
 center to tail radius: 106 mm (4.19 inches)

Materials
Body

cast aluminum with black anodized finish and heat-resistant black
paint

Shaft

centerless ground, stainless steel

[ Kit# 3482, FG#3480 ] Specifications

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 23

Bearing

 upper: sealed, stainless steel, ball bearing with application specific
lubrication
 lower: modified teflon bearing

Wing

precision balanced aluminum with black anodized finish and heat­resistant black paint

Cable

 Signal: 4 conductor 22 AWG, Teflon jacket with braid shield and
drain,
 Heater: 2 conductor 20 AWG, Teflon jacket with braid shield and
drain

Enclosure

 sealed to IP55
 heater is epoxy encapsulated to IP65
 sensor electronics epoxy encapsulated to IP65

Signal generator

epoxy encapsulated inside glass reinforced thermoplastic shell

Heater

fully encapsulated, self-regulating

Base

cast aluminum with black anodized finish and heat-resistant black
paint

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 24

PNP Output Circuit Operation

The NRG Turbine Control Yaw Vane has two output signals. The outputs are “PNP”, which means that an active

output sources current from the sensor supply to the load on the output.
Typically, these outputs are used by connecting the output to a grounded load such as a relay or optical isolator in

the turbine controller. The active outputs power the relay coil or opto-isolator loop, and when the output is
inactive, the load is off.

The opto-interrupters require an external power supply to operate the LED lamps. The sensor signals are
powered through an additional two wires: the red (excitation) and black (ground) wires.

NRG Turbine Control Yaw Vane (Unheated)
2 Ch, PNP

Kit# 3581
FG# 3579

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 25

Interpreting Output Signals – 2 Channels

The diagrams and table below indicate when each of the two outputs is active (1) or inactive (0), for each relative
direction the nose is pointing. For example, if the vane nose is pointing 35 degrees relative to the base, the V90
output (green wire) will become active.

Output Signals

Azimuth Range

(clockwise

degrees)

V90

V0

0 to 90

1

0

90 to 190

0

0

190 to 280

0

1

280 to 0

1

1

Output Signal

Wire Color

V90

Green

V0

White

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[ Kit# 3581, FG# 3579 ] Sensor and Mounting Outline

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 27

[ Kit# 3581, FG#3579 ] Specifications

Description
Sensor type

yaw error vane

Applications

wind turbine yaw control

Sensor range

mechanical range 360°

Output signal
Signal type

 PNP outputs: active high output sources current to the sensor
output load from the sensor power supply; inactive low output is
pulled down to ground by sensor output load
 each output can source up to 25 mA to within 1 V of the supply
voltage
 inactive output leakage is less than 100 uA

Transfer function

2 outputs; switch points at relative wind 0°, 90°, 190°, 280°

Accuracy

+/- 3 deg

Power requirements
Supply voltage

8 VDC to 24 VDC

Supply current

30 mA typical; sensor power draw is internally regulated

Response characteristics

Threshold

<2 m/s

Installation
Mounting

mounts to a 27 mm (1.05 inch) diameter pipe (3/4 inch pipe size) with
a 5/16 inch nut and bolt; cabling exits into mounting pipe

Tools required

13 mm (0.5 inch) nut driver

Environmental
Operating

temperature range

-40 °C to 60 °C (-40 °F to 140 °F)

Operating humidity
range

0 to 100% RH

Physical

Connections

Sensor Cable

 red: power
 black: ground
 white: V0
 green: V90

Cable length

Signal cable: 8.0 m (26.2 feet)

Weight

1.23 kg (2.7 pounds) not including cable

Dimensions

 overall assembly height: 239 mm (9.41 inches)
 body diameter: 70 mm (2.75 inches)
 swept diameter: 212 mm (8.38 inches)
 center to tail radius: 106 mm (4.19 inches)

Materials

Body

cast aluminum with black anodized finish and heat-resistant black
paint

Shaft

centerless ground, stainless steel

Bearing

 upper: sealed, stainless steel, ball bearing with application specific
lubrication
 lower: modified teflon bearing

Wing

precision balanced aluminum with black anodized finish and heat­resistant black paint

Cable

 Signal: 4 conductor 22 AWG, Teflon jacket with braid shield and
drain

Enclosure

 sealed to IP55
 sensor electronics epoxy encapsulated to IP65

Signal generator

epoxy encapsulated inside glass reinforced thermoplastic shell

Base

cast aluminum with black anodized finish and heat-resistant black
paint

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 28

Warranty & Repair

Two Year Limited Warranty

NRG Systems, Inc. (NRG) warrants its products for a period of two years from the date of original
purchase solely for the benefit of the original consumer purchaser. If this NRG product is determined
to be defective in materials or workmanship, NRG will, at NRG’s option, repair or replace this product
without charge. This warranty does not cover damage due to improper installation or use, accident or
misuse, lightning or damages due to any unauthorized service. This warranty also will not apply if
any seal on any instrument or sensor is broken or the equipment is not grounded.

To return a defective product, call NRG Systems at the telephone number listed below for an RMA
number. You must have available when you call the serial number of the item as well as the date
purchased. No products will be accepted for warranty work without an RMA number. The product
must be returned, postage prepaid, to NRG. Include a brief description of the problem, RMA number
and a return address with phone number.

The foregoing limited warranty is given in lieu of all other warranties, express or implied. NRG
specifically disclaims all implied warranties, including, but not limited to, any implied
warranties of merchantability and fitness for a particular purpose.

The above limited warranty expressly excludes, and NRG shall not be liable for, any incidental
or consequential damages caused or related to the use of, inability to use or malfunction of
this product.

Prompt disposition: NRG will make a good faith effort for prompt correction or other adjustment with
respect to any product which proves to be defective within warranty. First contact NRG or
representative from whom product was purchased and ask for an RMA number.

NRG will also make a good faith effort for prompt service after the warranty period. Contact NRG
with the nature of the problem and obtain an RMA number.

Inspect your shipments for damaged or missing packages immediately upon receipt. Record any
such exceptions on the freight receipt of the delivery agent. If any contents are damaged or missing,
report this in writing to the freight carrier and send NRG a copy of the damage report. If you insured
the shipment yourself, report any damages to your insurance carrier.

TEL: [phone] FAX: [phone] EMAIL: [e-mail]

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 29

Return Instructions (Repairs)

If you wish to return an item to NRG Systems for repair or any other reason, please before
shipping contact NRG’s Service Department by phone [phone] or fax (802) 482­2272 to obtain a Return Material Authorization (RMA) Number. The RMA Number allows us

to track and route your shipment or repair. Note the RMA Number on all boxes shipped to us
and refer to it in your correspondence or phone calls to us. Please fill out a copy of this sheet
and send it with your shipment to NRG Systems.

Date: Your Name: RMA No:
Items being returned: Serial Number:
Reason for return:
Warranty: Yes No Not Sure Purchase Date / Invoice No:
Estimate for repair charges requested? Yes No Repair not to exceed US$:
Person to be contacted with estimate: Phone:
Person to issue Purchase Order for repair: Phone:
Billing Address: Shipping Address:

Send your shipment FREIGHT PREPAID and INSURED against loss or damage in transit to:

NRG Systems, Inc.
Attn: Receiving Dept., RMA No. R-________
110 Riggs Road
Hinesburg, VT 05461, USA

SHIPMENTS SENT FREIGHT COLLECT WILL NOT BE ACCEPTED BY NRG SYSTEMS.
International Customers please state the following in your shipping documents:

“THESE ITEMS ARE BEING RETURNED TO THEIR U.S. MANUFACTURER.
COUNTRY OF MANUFACTURE AND ORIGIN IS U.S.A. HS CODE 9801.00.1025”

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 30

IceFree3_Turbine_Control_Vane_Manual | Rev 3.0 | 30 January 2015 | [e-mail] || 31