Siemens Flowrite 599 Series Owner's manual

Flowrite™ 599 Series

Technical Instructions

Document No. 155-180P25

EA 599-4

February 28, 2018

SKD6xU Electronic Valve

Actuators

24 Vac Proportional Control

Siemens Industry, Inc.

Description The Flowrite 599 Series SKD6xU Electronic Valve Actuators require a 24 Vac supply

and receive a 0 to 10 Vdc or a 4 to 20 mA control signal to proportionally control a

valve. These actuators are designed to work with Flowrite 599 Series valves with a 3/4-

inch (20 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 or non-spring return fail-in-place

•Automatic stroke calibration

•Maintenance-free

Application These electronic actuators are designed to be used with Flowrite 599 Series valves and

Siemens Industry standard valves with a 3/4-inch (20 mm) stroke in liquid service

applications.

CAUTION:

Do not use in low pressure steam applications.

Product Number SKD62U, Spring Return (Actuator Prefix Code 274)

SKD60U, Non-Spring Return (Actuator Prefix Code 267)

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.

Technical Instructions SKD6xU Electronic Valve Actuators 24 Vac Proportional Control

Document Number 155-180P25

February 28, 2018

Page 2 Siemens Industry, Inc.

Specifications

Power supply Operating voltage 24 Vac -20%/+30%

Frequency 50/60 Hz

Power consumption 17 VA/12W

Control signals Control input (Y)

Voltage 0 to 10 Vdc or 4 to 20 mA

(DIP switch selectable)

Maximum Impedance 0 to 10 Vdc 100K ohms

4 to 20 mA; 240 ohm

Signal resolution <1%

Hysteresis 1%

Control input (Z)

Resistance 0 to 1000 ohms

Voltage 0 to 1.6V

Control output (U) – position feedback

Voltage 0 to 9.8 Vdc + 2%

Load Impedance >10K ohm

Current 4 to 19.6 mA + 2%

Load impedance < 500 ohms

Function Nominal stroke 3/4-inch (20 mm)

Run time with control operation (full stroke)

Pushing stroke, 0 to 100% 30 seconds

Pulling and Spring return stroke, 100 to 0% 15 seconds

Nominal Force Stroke Force

NC and 3-way upper 0% 225 lbs (1000 N)

NO and 3-way by-pass 100% 258 lbs (1150 N)

Agency Certification UL approval UL873

cUL Certified to Canadian standard

C22.2 No. 24-93

conformity per the EMC directive 89/336/EEC

Low voltage directive 73/23/EEC

Ambient conditions Ambient temperature (Operation) 5°F to 122°F (-15°C to 50°C)

Media temperature -13°F to 300°F (-25°C to 150°C)

<32°F (0°C) requires a Stem Heater

Housing NEMA Rating NEMA 1 (interior only)

See Accessories.

Miscellaneous Dimensions See Figure 17

Conduit opening 1/2-inch NPSM

Weight

SKD60U 7.9 lbs (3.6 kg)

SKD62U 8.5 lbs (3.85 kg)

SKD6xU Electronic Valve Actuators 24 Vac Proportional Control Technical Instructions

Document Number 155-180P25

February 28, 2018

Siemens Industry, Inc. Page 3

Accessories NOTE:Installation instructions are included with each accessory.

Figure 1. Auxiliary Switch.

ASC1.6 Auxiliary switch.

Sends a signal to indicate the valve is in

the 0% stroke position. Switching point is

fixed at the 0% stroke position.

Switching capacity 24 Vac

4A resistive

2A inductive

Lowest recommended

current 10 mA

Figure 2. Packing Heating Element.

599-00417 Packing heating element.

Allows stem to move freely in valves

controlling fluids at temperatures below

32°F (0°C). Reduces ice crystal formation

on the stem which may damage the

packing.

Operating Voltage 24 Vac

Heating Output 20 W

Figure 3. Weather Shield.

599-10071 Weather Shield.

See Service Kits for replacement ultraviolet

resistant cable ties.

Service Kits The only field serviceable part is the circuit board.

Circuit board replacement 4-668-5748-8

Plastic wiring compartment cover 4-104 5634-8

Manual Override Kit for SKD 4-268 5504-8

Ultraviolet (UV) resistant cable ties (pkg. of 10) 538-996

WARNING:

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

disassemble the actuator.

Technical Instructions SKD6xU Electronic Valve Actuators 24 Vac Proportional Control

Document Number 155-180P25

February 28, 2018

Page 4 Siemens Industry, Inc.

SKD Details

Figure 4. SKD6xU Details.

Legend

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

Operation 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 SKD62U Actuator spring returns the

valve to its normal position, and the SKD60U Actuator fails in place.

Figure 5. Figure 6.

Spring return: When power is turned off or

in the event of a power failure, the actuator

spring returns the valve to its normal

position.

Non-spring return: When power is turned

off or in the event of a power failure, the

actuator maintains its position.

Figure 7. Valve Stem Travel Indication.

SKD6xU Electronic Valve Actuators 24 Vac Proportional Control Technical Instructions

Document Number 155-180P25

February 28, 2018

Siemens Industry, Inc. Page 5

Mounting and

Installation

Figure 8. Acceptable Mounting Positions.

The vertical position is the recommended position for mounting. Other positions are

allowed. When using the Weather Shield for NEMA 3R rating, the vertical position is

required. See Weather Shield installation instructions and Figure 8.

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 17.

Detailed installation instructions for field mounting are shipped with the actuator.

Start-up Check the wiring for proper connections.

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

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 24 Vac

power supply. The calibration procedure can be repeated as often as necessary.

CAUTION:

Before starting calibration, be sure the manual adjuster

is set to Automatic to register the actual values.

There is a slot on the printed circuit boards of the actuators. To

initiate the calibration procedure, the contacts inside this slot

must be short-circuited, for example, with a screwdriver

(see Figure 9).

Automatic calibration proceeds as follows (see Figure 10):

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

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

(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 9.

Figure 10.

Technical Instructions SKD6xU Electronic Valve Actuators 24 Vac Proportional Control

Document Number 155-180P25

February 28, 2018

Page 6 Siemens Industry, Inc.

Stroke Calibration,

Continued Table 1. 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

Faulty stroke calibration

Internal Error

- Check mounting

- Restart stroke calibration (by

short-circuiting calibration slot)

- Replace electronics

Flashing Inner valve jammed Check the valve

OFF •No power supply

•Faulty electronics -Check mains

-Replace electronics

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

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

SKD6xU Electronic Valve Actuators 24 Vac Proportional Control Technical Instructions

Document Number 155-180P25

February 28, 2018

Siemens Industry, Inc. Page 7

Start-up, Continued

1 2

Figure 11. SKD Electronic Features.

DIP Switches

(Left to right)

Selection of

Control Signal

Selection of

Flow Characteristic

ON 4 to 20 mA Modified*

OFF

Factory Setting 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.

Normally Closed Valve Actuator pressure cylinder moves:

•Outward (0 to 1): Valve opens.

•Inward (1 to 0): Valve closes.

Normally Open Valve Actuator pressure cylinder moves:

•Outward (0 to 1): Valve closes.

•Inward (1 to 0): Valve opens.

Three-Way Valve Actuator pressure cylinder moves

•Outward (0 to 1): Valve opens between port NC and C.

•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.

Technical Instructions SKD6xU Electronic Valve Actuators 24 Vac Proportional Control

Document Number 155-180P25

February 28, 2018

Page 8 Siemens Industry, Inc.

Manual Operation

Figure 12. The Manual Setting Knob in Manual and Automatic Position.

- Turn the manual setting knob clockwise for manual operation.

- A red indicator becomes visible as you begin to crank. Each complete revolution

(360°) is equal to 3/32-inch (2.5 mm) stroke.

- 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.

Automatic operation 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.

Wiring Do not use autotransformers. Use earth ground isolating step-down Class 2 power

supplies.

Determine supply transformer rating by summing total VA of all actuators used.

The maximum rating for Class 2 step-down transformer is 100 VA.

•Since SKD6xU actuators require ≈20 VA, a maximum of four actuators can be

•Operating more than four SKD6xU 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.

SKD6xU Electronic Valve Actuators 24 Vac Proportional Control Technical Instructions

Document Number 155-180P25

February 28, 2018

Siemens Industry, Inc. Page 9

Wiring Diagrams

Figure 13. Connecting Terminals.

24 Vac

G System Potential (SP)

G0 System Neutral (SN)

Y Control input 0 to 10 Vdc or 4 to 20 mA (DIP switch selectable)

M Measuring neutral

U Position indication 0 to 10 Vdc or 4 to 20 mA, (see Table 2.

Z Override control

Table 2.

Actuator input signal

Receiving Impedance

Low (<500

Ohm) High (>10K Ohm)

0 to 10 Vdc 0 to 20 mA 0 to 10 Vdc

4 to 20 mA 4 to 20 mA 2 to 10 Vdc

Figure 14. Auxiliary Switch ASC1.6. Figure 15. Packing Heating Element

599-00417.

Troubleshooting Check that the wires are connected correctly and attached securely.

Check for adequate power supply.

Check that the actuator is set for automatic operation. See the Start-Up section.

Technical Instructions SKD6xU Electronic Valve Actuators 24 Vac Proportional Control

Document Number 155-180P25

February 28, 2018

Page 10 Siemens Industry, Inc.

Dimensions

Figure 16. Dimensions of 599-10071 Weather Shield in Inches (Millimeters).

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