User Manual

ManualsBrandsSiemens ManualsLarge Stroke (BC1)2-port valves PN25, flanged connections, VVF52..

CE1N4389en

10.01.2011

Building Technologies

389

ACVATIX™

Control device PN25, safety

function to DIN EN 14597

MK..5..G

Preassembled valve-actuator combinations for steam applications

• MKB532..G Operating voltage AC 230 V, 3-position control signal

• MKB562..G Operating voltage AC 24 V, control signal DC 0...10 V,

4...20 mA or 0...1000 Ω

• MKB562..G Choice of flow characteristic, position feedback,

stroke calibration, LED status indication, override control

• Electrohydraulic actuators

• With safety function to DIN EN 14597

• With position indicator

• Optional functions with auxiliary switches and potentiometer

• Nodular cast iron EN-GJS-400-18-LT valve body

• DN 15...40

• k

1.25...25 m

Use

Control devices with safety shut-off function per DIN EN 14597 for protection

against excessive temperature and pressure in district heating, heating, ventilation

and air conditioning systems using steam as medium.

For closed circuits.

Summary of content (14 pages)

PAGE 1
s 4 389 ACVATIX™ Control device PN25, safety function to DIN EN 14597 MK..5..G Preassembled valve-actuator combinations for steam applications • • MKB532..G MKB562..G • • • • • • • • Operating voltage AC 230 V, 3-position control signal Operating voltage AC 24 V, control signal DC 0...10 V, 4...20 mA or 0...1000 Ω MKB562..
PAGE 2
Type summary Control device MKB532..G MKB562..G Electrohydraulic actuator 2800 N, 120 s Operating voltage AC 230 V AC 24 V Positioning signal 3-position DC 0…10 V, DC 4…20 mA, 0…1000 Ω Δpmax Δps 2-port valve Product number Stock number Product number Stock number MKB532.15-1.2G S55329-M123-A110 MKB562.15-1.2G S55329-M123-A111 [kPa] [kPa] DN kvs 1.25 MKB532.15-1.6G S55329-M124-A110 MKB562.15-1.6G S55329-M124-A111 MKB532.15-2G S55329-M125-A110 MKB562.15-2G S55329-M125-A111 MKB532.15-2.
PAGE 3
Steam applications For applications with saturated steam, super-heated steam up to max. 600 kPa (6 bar) abs Pay attention to the valve's flow direction. Spring return facility The return spring causes the actuator to move to the «0 %» stroke position and closes the valve. MKB532..G 3-position • Voltage on Y1 piston extends valve opens • Voltage on Y2 piston retracts valve closes • No voltage on Y1 and Y2 piston / valve stem remain in the respective position MKB562..G DC 0...10 V, DC 4… 20 mA, 0...
PAGE 4
Stroke calibration MKB562..G In order to determine the stroke positions 0 % and 100 % in the valve, calibration is required on initial commissioning: Stroke 4567Z09 Prerequisites • Red safety clamp is removed, see “Commissioning notes”, page 9 • AC 24 V power supply • Housing cover removed Calibration 01124 1. Short-circuit contacts in calibration slot green LED flashes; (e.g. with a screwdriver) position feedback 2. Actuator moves to «0 %» stroke position (1) U inactive (valve closed) 3.
PAGE 5
Override control input can be operated in following different modes of operation Override control input Z MKB562..
PAGE 6
Sizing Flow diagram Δpmax = Δpv100 = = V 100 100 kPa = 3 1 m /h = Valve flow characteristic Maximum permissible differential pressure across the valve, valid for the entire actuating range of the motorized valve Differential pressure across the fully open valve and the valve’s control path by a volume flow V100 Volume flow through the fully open valve (H100) 1 bar ≈ 10 mWC 0.
PAGE 7
Absolute working pressure [bar] Working pressure and medium temperature Saturated steam Superheated steam Medium temperature [°C] wet steam saturated steam superheated steam avoid permissible range of use For saturated steam and superheated steam the differential pressure Δpmax across the valve should be close to the critical pressure ratio.
PAGE 8
Engineering notes The use of these valves for steam is subject to specific parameters: Observe diagram for steam on page 7 and "Technical data" on page 10! To ensure the reliability of the valve, we recommend the fitting of a strainer at the valve inlet even in closed circuits. Conduct the electrical connections in accordance with local regulations on electrical installations as well as the internal or connection diagrams.
PAGE 9
Commissioning notes The manual adjuster must remain secured with anti-tamper screws as factory delivered. When removing anti-tamper screws TÜV approval for the safety function to DIN EN 14597 ceases. Valve stem retracts: Valve stem extends: valve opens valve closes = increasing flow = decreasing flow When commissioning the system, check the wiring and functions, and set any auxiliary switches and potentiometers as necessary, or check the existing settings.
PAGE 10
Warning A damaged housing or cover represents an injury risk. • NEVER uninstall an actuator from the valve. • Uninstall the valve-actuator combination (actuating device) as a complete device. • Use only properly trained technicians to uninstall the unit. • Send the actuating device together with an error report to your local Siemens representative for analysis and disposal. • Properly mount the new actuating device (valve and actuator).
PAGE 11
Actuators Power supply MKB532..G MKB562..G AC 230 V ± 15 % AC 24 V –20 % / +30 % SELV / PELV Operating voltage Voltage tolerance Frequency 50 or 60 Hz Max. Power consumption at 50 Hz External supply cable fuse Signal inputs 15 VA / 13 W 17 VA / 12 W min. 0.5 A, slow max. 6 A, slow Control signal Y 3-position Voltage Input impedance Current Input impedance Signal resolution Hysteresis Resistor 1000 Ω Z not connected No function, priority terminal Y Z connected directly to G max.
PAGE 12
MKB532..G MKB562..G Conform with C-tick N474 Environmental compatibility ISO 14001 (Environment) ISO 9001 (Quality) SN 36350 (Environmentally compatible products) RL 2002/95/EG (RoHS) Pressure Equipment Directive PED 97/23/EC As per article 3, section 1.4 Accessories with safety functions Category IV, with EC design examination module B, test authority number 0036 to ISO 7005 Fluid group 2 Flange connections Accessories ASC1.6 Switching capacity Auxiliary switch ASC9.
PAGE 13
Connection terminals MKB562..G operating voltage AC 24 V: system neutral (SN) operating voltage AC 24 V: system potential (SP) Positioning signal DC 0...10 (30) V or DC 4...20 mA Measuring neutral (= G0) Position indication DC 0...10 V or DC 4...20 mA Override control (functionality see page 5) Auxiliary switch ASC1.6 c1 Connection diagrams MKB532..
PAGE 14
Dimensions All dimensions in mm Minimum clearance from ceiling or wall for mounting, connection, operation, maintenance etc. ► = > 100 mm ►► = > 200 mm DN B D D2 D4 K L1 L2 L3 Ø Ø Ø Ø 46 65 130 65 69 15 16 95 25 18 115 65 85 160 80 73 40 20 150 19 (4x) 84 110 200 100 97.5 14 (4x) H 439 kg 12 14.7 432 17.8 DN = Nominal size Revision numbers for control devices MK..5..G Type Valid from Rev.-No. MKB532..G Actuator, refer to data sheet N4564: SKB32.