Siemens Flowrite 599 Series, SKB62UA Series, SKB62UC Series, SKB62UD Series Technical Instructions

Flowrite™ 599 Series

Technical Instructions

Document No. 155-717

September 25, 2018

SKB/C/D 62UA Series
Electronic Valve Actuator 24 Vac
Proportional Control
Advanced Features

SKB/C

SKD

Siemens Industry, Inc.

Description

The Flowrite 599 Series SKB/C/D62UA Electronic Valve Actuator requires a 24 Vac
supply and receives a 0 to 10 Vdc or a 4 to 20 mA control signal to proportionally control
a valve. This actuator is designed to work with valves with a 3/4-inch (20 mm) or 1-1/2­inch (40 mm) stroke.

Features

• Direct-coupled installation requires no special tools or adjustments

• Visual and electronic stroke indication

• Die-cast aluminum housing

• Manual override

• Spring return to fail-safe position

• Automatic stroke calibration

• Direct or reverse acting

• Adjustable start and span

• Stroke limit control

• Choice of linear or equal-percentage flow characteristic

• Maintenance-free

Application

These electronic actuators are designed to be used with Flowrite 599 Series valves with
either 3/4-inch (20 mm) stroke (SKB/D) or a 1-1/2 inch (40 mm) stroke (SKC) in liquid
and steam service applications; or other manufacturer's valves with appropriate
Universal Valve Linkage Kits.

Technical Instructions Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
September 25, 2018

Page 2 Siemens Industry, Inc.

Product Numbers

Table 1. Product Numbers.

Actuator

Stroke

Order Number

3/4-inch (20 mm)

SKB62UA

SKD62UA

1-1/2 inch (40 mm)

SKC62UA

Warning/Caution Notations

WARNING:

Personal injury or loss of life may occur if you do not
perform a procedure as specified.

CAUTION:

Equipment damage or loss of data may occur if you
do not perform a procedure as specified.

Specifications

Power Supply

Operating voltage (SELV,PELV) 24 Vac ± 20%
Frequency 50 or 60 Hz
Power consumption
SKB62UA 17 VA/12W

SKC62UA 28 VA/20W
SKD62UA 17 VA/12W

Operating

Type of control (proportional) 0 to 10 Vdc; 4 to 20 mA;
or 0 to 1000 ohms

Running time Opening: Closing:
SKB62UA 120 seconds 15 seconds
SKC62UA 120 seconds 20 seconds
SKD62UA 30 seconds 15 seconds

Spring-return time Closing:
SKB62UA 15 seconds
SKC62UA 20 seconds
SKD62UA 15 seconds

Nominal stroke
SKB62UA 3/4-inch (20 mm)
SKC62UA 1-1/2-inch (40 mm)
SKD62UA 3/4-inch (20 mm)

Position force
SKB/C 62UA 2800N
SKD62UA 1000N

Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features Technical Instructions
Document Number 155-717
September 25, 2018

Siemens Industry, Inc. Page 3

Signal Inputs

Terminal Y
Voltage 0 to 10 Vdc

Input impendence 100K ohm
Current 4 to 20 mA
Input impedance 240 ohm
Signal resolution <1%
Hysteresis <1%

Terminal Z
Resistance 0 to 1000 ohm

Override control functions
Z not connected No function (priority at Terminal Y)
Z connected directly to G Maximum stroke 100%
Z connected directly to G0 Minimum stroke 0%
Z connected to M via 0 to 1000 ohm Linear or equal percentage

Signal Inputs, Continued

Terminal U
Voltage 0 to 9.8 Vdc ± 2%
Load impedance >500 ohm
Current 4 to 19.6 mA ± 2%
Load impedance <500 ohms

Ambient Conditions

Media temperature
SKD 20°F to 300°F (-7°C to 150°C)
SKB/C 20°F to 337°F (-7°C to 170°C)

Operation To IEC 721-3-3
Environmental conditions Class 3K5
Temperature

SKD 5°F to 122°F (-15°C to 50°C)
SKB/C 5°F to 130°F (-15°C to 55°C)

Humidity 5% to 95% rh

Transport To IEC 721-2-1
Environmental conditions Class 3K5
Temperature 22°F to 149°F (-5°C to 65°C)
Humidity <95% rh

Storage To IEC 721-3-1
Environmental conditions Class 1K3
Temperature

SKD 5°F to 122°F (-15°C to 50°C)
SKB/C 5°F to 130°F (-15°C to 55°C)

Humidity 5% to 95% rh

Agency Certification

UL Listed to UL873
C-UL Certified to Canadian standard
C22.2 No. 24-93

Meets CE requirements:
EMC Directive 89/336/EEC

C-tick N474
Protection standard IP54 to EN 60 529

Protection Class III to EN 60 730

Technical Instructions Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
September 25, 2018

Page 4 Siemens Industry, Inc.

Miscellaneous

Materials
Actuator housing and bracket Die-cast aluminum
Housing box and manual adjustor Plastic

Conduit opening 1/2-inch NPSM
Dimensions See Figure 23, Figure 24, Figure 25

and Figure 26.
Weight

SKB62UA 18.9 lbs (8,60 kg)
SKC62UA 22.5 lbs (10,00 kg)
SKD62UA 8.5 lbs (3,85 kg)

Housing

NEMA Rating NEMA 1 (Interior only)
See Accessories

Advanced Features

Direction of Operation
Direct acting / reverse acting 0 to 10 Vdc; 10 to 0 Vdc
4 20 mA; 20 to 4 mA
0 to 1000 ohm/1000 to 0 ohm
Stroke Limit Control
Range of lower limit 0% to 45% adjustable
Range of upper limit 100% to 55% adjustable

Sequence Control
Starting Point of Sequence (Start) 0 to 15V adjustable
Operating Range of Sequence (Span) 3 to 15V adjustable

Accessories

Figure 1. Auxiliary Switch.

ASC1.6 Auxiliary switch

• Sends a signal to indicate that the valve is
in the 0% stroke position.

• The switching point is fixed at the 0%
stroke position.

Switching capacity 24 Vac
4A resistive,
2A inductive

Lowest recommended current 10 mA

Figure 2. Stem Heating Element.

ASZ6.6 The stem heating element prevents

the formation of ice on the stem when the
medium temperature drops below 32°F (0°C).
It is suited for universal use with valves having
a stem or spindle diameter of 10 or 14 mm.

Operating voltage 24 Vac/dc ± 20%
Power consumption ≤ 40 VA/30W

Figure 3. SKB/C Weather Shield.

599-10065 The SKB/C actuator is UL listed to

meet NEMA Type 3R requirements (a degree
of protection against rain, sleet, and damage
from external ice formation) when installed with
this weather shield and outdoor-rated conduit
fittings in the vertical position. See Service Kits
for replacement ultraviolet resistant cable ties.

Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features Technical Instructions
Document Number 155-717
September 25, 2018

Siemens Industry, Inc. Page 5

Accessories,
Continued

Figure 4. SKD Weather Shield.

599-10071 The SKD actuator is UL listed to

meet NEMA TYPE 3R requirements (a degree
of protection against rain, sleet, and damage
from external ice formation) when installed with
this weather shield and outdoor-rated conduit
fittings in the vertical position. See Service Kits
for replacement ultraviolet resistant cable ties.

Figure 5. Valve Retrofit Kit.

Universal Retrofit Kit

Kit contains the parts needed to adapt a valve
to the following Siemens 599 Series Flowrite
actuators: SKB, SKC, SKD, SQX. Selected
valves from the following manufacturers can
also be accommodated: Honeywell, Johnson
Controls, and Siebe. See your local Siemens
representative for details.

Service Kits

Circuit board replacement 4 668 5751 8
Manual override kit 4268 5510 8
Plastic wiring compartment cover 4 104 5582 8
Stem retainer kit

Contains one stem nut (Figure 7, Item 6) and one stem retainer clip.
2-1/2 and 3-inch valves 599-10048
4, 5, and 6-inch valves 599-10049

Retainer clamp kit 599-10200
Ultraviolet (UV) resistant cable ties (pkg. of 8) 538-994

WARNING:

This product contains a spring under high compression. Do not
attempt to disassemble the actuator.

Valve Details

Figure 6. SKB/C Valve Parts.

1. Manual Adjuster

2. Pressure Cylinder

3. Piston

4. Reservoir

5. Pressure Chamber

6. Pump

7. Return Spring

8. Bypass Valve

9. Coupling

10. Valve Stem

11. Inner Valve

12. Position Indicator (0 to 1)

Technical Instructions Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
September 25, 2018

Page 6 Siemens Industry, Inc.

Valve Details,
Continued

Figure 7. SKD Valve Parts.

1. Pressure cylinder

2. Piston

3. Oscillating pump

4. Return spring

5. Bypass valve

6. Valve stem retainer

7. Manual override knob

8. Position indicator

Standard Operation

Figure 8. SKB/C Valve Stem Travel Indication.

Figure 9. SKD Valve Stem Travel Indication.

The actuator accepts a 0 to 10 Vdc or a 4 to 20 mA control signal. The actuator
mounted on a valve produces a stroke proportional to the input signal. When power is
turned off or in the event of a power failure, the actuator spring returns the valve to its
normal position.

Direct Acting

Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features Technical Instructions
Document Number 155-717
September 25, 2018

Siemens Industry, Inc. Page 7

Mounting and
Installation

The vertical position is the recommended position for mounting and the only position for
NEMA Type 3R rating with the Weather Shield. Acceptable mounting positions are shown
in Figure 10.

Figure 10. Acceptable Mounting Positions.

Allow four inches (100 mm) around the sides and back of the actuator and eight inches
(200 mm) above and to the front of the actuator.

See dimensions in Figure 23, Figure 24, Figure 25, and Figure 26.
Detailed installation instructions for field mounting are shipped with the actuator.

CAUTION:

When removing the knockout do not damage the circuit board. Use
the top knockout position, if possible.

Start-up

Check the wiring for proper connections.

NOTE: The valve body assembly determines the complete assembly action.

Spring Return
Function

All SKB/C/D62UA actuators are factory-fitted with a spring-return function. If the control
signal or power supply fails, the actuator will return to the 0% stroke position (stem fully
retracted).

Override Control

The override control input (Z) has three modes of operation:

NOTE: The Z-modes have a "direct acting" factory setting.

Technical Instructions Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
September 25, 2018

Page 8 Siemens Industry, Inc.

Stroke Calibration

To determine the stroke positions 0% and 100% in the valve, calibration is required when the
valve/actuator are commissioned for the first time. The actuator must be mechanically
connected to a valve and must have a supply voltage of 24 Vac. The calibration procedure can
be repeated as often as necessary

CAUTION:
Before starting calibration, be sure that the manual adjuster is set to Automatic for

the actual values to register.

There is a slot on the printed circuit boards for the actuators. To
initiate the calibration procedure, the contacts inside this slot must
be short-circuited (possibly with a screwdriver). See Figure 11.

Automatic calibration proceeds as follows (see Figure 12):

• Actuator runs to the 0% stroke position (1), the green LED

flashes.

• Actuator then runs to the 100% stroke position (2), the

green LED flashes.

• Measured values are stored in the EPROM.

• The actuator now moves to the position defined by control

signal Y or Z (3), and the green LED now glows steady
(normal operation).

• Throughout this procedure, output U is inactive, meaning

the values only represent actual positions when the green
LED stops flashing and remains on continuously.

Figure 11.

Figure 12.

Automatic Calibration.

Table 2. LED Status.

LED

Display

Function

Action

Green

ON

Normal Operation

Automatic operation

Flashing

Stroke calibration In
Progress

Wait for calibration to be
completed (LED stops flashing)

Red

ON

Faulty stroke calibration

Internal Error

- Check mounting

- Restart stroke calibration (by
short-circuiting calibration slot)

- Replace electronics

Flashing

Valve plug jammed

Check the valve

OFF

• No power supply

• Faulty electronics

- Check mains

- Replace electronics

Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features Technical Instructions
Document Number 155-717
September 25, 2018

Siemens Industry, Inc. Page 9

Start-up, Continued

Advanced Features

1 2 3

4

Figure 13. DIP Switches.

DIP Switches

(From Left to Right)

1

Select

Direction of

Operation

2

Sequence Control

or

Stroke Limit Control

3

Selection of

Control

Signal

4

Selection of

Flow

Characteristic

ON

Reverse-acting

Sequence control

4 to 20 mA

Modified*

OFF

(Factory Settings)

Direct-acting

Stroke limit control

0 to 10 Vdc

Default

*Changing the default setting will modify an equal percentage valve to a linear flow characteristic. When

set to default, the flow characteristic is determined by the valve body.

Technical Instructions Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
September 25, 2018

Page 10 Siemens Industry, Inc.

Start-Up,
continued

Selecting the
Direction of
Operation

• With normally-closed valves, "direct-acting" means that with a 0 Vdc signal input, the valve
is closed.

• With Normally-open valves, "direct-acting" means that with a 0 Vdc signal input, the valve
is open.

Input:

0 to 10 Vdc

Input

10 to 0 Vdc

0 Vdc

10 Vdc

4 to 20 mA

20 to 4 mA

4 mA

20 mA

0 to 1000 ohm

1000 to 0 ohm

0 ohm

1000 ohm

Figure 14. Direction of Operation.

Sequence Control
or Stroke Limit
Control

Check the wiring for proper connections.

NOTE: The valve body assembly determines the complete assembly action.

Table 3. Table 4.

Setting the Stroke Limit Control

Setting the Sequence Control

The rotary switches LO and UP can be
used to apply an upper and lower limit
to the stroke in increments of 3% up to
a maximum of 45%.

The rotary switches LO and UP can be used
to determine the starting point (Start) or the
operating range of a sequence (Span).

Position

of

LO

Lower
Stroke

Limit

Position

of

UP

Upper

Stroke

Limit

Position

of

LO

Starting

Point for

Sequence

Control

Position

of

UP

Operating

Range of

Sequence

Control

0

0% 0 100% 0

0V 0 10V

1

3% 1 97% 1

1V 1 10V*

2

6% 2 94% 2

2V 2 10V*

3

9% 3 91% 3

3V 3 3V*

4

12% 4 88% 4

4V 4 4V

5

15% 5 85% 5

5V 5 5V

6

18% 6 82% 6

6V 6 6V

7

21% 7 79% 7

7V 7 7V

8

24% 8 76% 8

8V 8 8V

9

27% 9 73% 9

9V 9 9V

A

30% A 70% A

10V A 10V

B

33% B 67% B

11V B 11V

C

36% C 64% C

12V C 12V

D

39% D 61% D

13V D 13V

E

42% E 58% E

14V E 14V

F

45% F 55% F

15V F 15V

*The smallest adjustment is 3 Vdc; Control with 0 to
3 Vdc is possible only via Y.

Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features Technical Instructions
Document Number 155-717
September 25, 2018

Siemens Industry, Inc. Page 11

Start-up, continued

Normally Closed Valve

When actuator pressure cylinder:

Moves outward (0 to 1): Valve opens.
Moves inward (1 to 0): Valve closes.

Normally Open Valve

When actuator pressure cylinder:

Moves outward (0 to 1): Valve closes.
Moves inward (1 to 0): Valve opens.

Three Way Valve

When actuator pressure cylinder:

Moves outward (0 to 1): Valve opens between port NC and C.
Moves inward (1 to 0): Valve opens between ports NO and C.

The measuring voltage at terminal U provides valve stem position feedback to an
indicating instrument or building automation system.

Manual operation

Figure 15. SKB/C Manual

Operation.

Figure 16. SKD Manual Operation.

Turn the manual setting knob clockwise for
manual operation. As you begin to turn, a red
indicator becomes visible. Each complete
revolution (360°) is equal to 3/32-inch (2.5 mm)
stroke.

NOTE: If a signal is sent to the actuator while it is in manual operation, the actuator

will move, but the control will not be accurate. The valve cannot be
commanded to its 0% position while in manual operation.

Technical Instructions Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
September 25, 2018

Page 12 Siemens Industry, Inc.

Start-up, Continued

Automatic Operation
SKB/C

When returning to automatic control, you must turn the crank arm of the manual
setting knob counterclockwise until the red numbers disappear. It is essential that the
window is clear and the crank arm is snapped into position. See Figure 17.

Figure 17. SKB/C Automatic Operation.

SKD

For automatic operation, the manual override knob must be in the fully closed
position. Turn the manual override knob counterclockwise until the red indicator
disappears.

Figure 18.

Fully Retracted Coupling

Fully Extended Coupling

► Stroke = 0%

► Stroke = 100%

CAUTION:
The manual adjuster must be rotated
counterclockwise to the end stop until
the red indicator marked MAN is no
longer visible.

Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features Technical Instructions
Document Number 155-717
September 25, 2018

Siemens Industry, Inc. Page 13

Wiring

Do not use auto-transformers. Use earth ground isolating step-down Class II power
supplies.

Determine supply transformer rating by summing total VA of all actuators used.
Determine the rating for Class 2 step-down transformer is 100 VA and consider the

following requirements:
SKB62UA = 17 VA SKC62UA = 28 VA SKD62UA = 17 VA;

A maximum of four actuators can be powered by one transformer (80% of transformer
VA). Operating more than four SK series actuators requires additional transformers or
separate 100 VA power supplies.

The position output signal U will switch from 0 to 10 Vdc to 4 to 20 mA when a 4 to
20 mA input signal is selected and used on the Y terminal.

Wiring Diagrams

Figure 19. Terminal Connections.

24 Vac

G

System potential (SP)

G0

System neutral (SN)

Y

Control input signal 0 to 10 (30) Vdc or 4 to 20 mA

M

Measuring neutral

U

Position indication 0 to 10 Vdc or 4 to 20 mA (see Table 1)

Z

Override input.

Figure 20. Auxiliary Switches.

Table 1. Actuator Output Signal U.

Actuator Input Signal

Receiving Impedance

Low

(<500 ohm)

High

(>10K ohm)

0 to 10 Vdc

0 to 20 mA

0 to10 Vdc

4 to 20 mA

4 to 20 mA

2 to 10 Vdc

Technical Instructions Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
September 25, 2018

Page 14 Siemens Industry, Inc.

Wiring Diagrams, Continued

System neutral (SN) red

System potential (SP) black

24 Vac/30W

Figure 21.

Auxiliary Switch

ASC1.6.

Figure 22.

Stem Heating Element

ASZ6.6.

Dimensions

Figure 23. Dimensions of 599-10065 SKB\C Weather Shield in Inches (Millimeters).

Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features Technical Instructions
Document Number 155-717
September 25, 2018

Siemens Industry, Inc. Page 15

Dimensions,
Continued

Figure 24. Dimensions of 599-10071 SKD Weather Shield in Inches (Millimeters).

Figure 25. Dimensions of SKB/C Weather Shield, 599-10071 in Inches (Millimeters).

Technical Instructions Flowrite 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
September 25, 2018

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Flowrite is a trademark of Siemens Industry, Inc. Other product or company names mentioned herein may
be the trademarks of their respective owners. © 2018 Siemens Industry, Inc.

Siemens Industry, Inc.

Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089
USA
+ 1 847-215-1000

Your feedback is important to us. If you have comments about this

document, please send them to

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Document No. 155-717

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Page 16

Dimensions,
Continued

Figure 26. Dimensions of SKD Actuator in Inches (Millimeters).