User manual HONEYWELL ML7420 DATASHEET

[. . . ] ML7420A/ML7425A, B Electric Linear Valve Actuator SPECIFICATION DATA FEATURES · · · · · · · · · · · · · Easy and quick installation No separate linkage required No adjustments required Low power consumption Force-limiting end stops Spring-return models (ML7425A, B) Manual operation knob Position feedback signal 0. . . 10 Vdc or 2. . . 10 Vdc signal input selectable Direct / reverse action selectable Stroke position on signal failure selectable Corrosion-resistant design Maintenance-free ML7420 ML7425 SPECIFICATIONS Temperature Limits Ambient operating limits Ambient storage limits Medium valve temperature Signals Signal input voltage Signal source Position feedback signal Load Safety Protection class Protection standard Flame retardant housing -10. . . +50 °C at 5. . . 95% r. h. 150 °C (220 °C with High-Temperature kit) y = 0. . . 10 Vdc or 2. . . 10 Vdc Ri = 100k 1 k max. III as per EN60730-1 IP54 as per EN60529 V0 as per UL94 (with metal cable gland) GENERAL The ML7420A / ML7425A, B actuators are designed for modulating control with controllers providing an analog output of 0. . . 10 Vdc or 2. . . 10 Vdc. [. . . ] An integrated spring package limits the stem force to a factory-set value in either direction. The actuator switches off precisely when the specified stem force is reached. The spring return actuators are shipped from the factory with a shipment stop (to lock the manual operation knob) in order to allow connection of the stem button retainer to the valve stem without power supply. Electrical Installation The actuators are delivered with a pre-installed cable gland M20 and two additional knock-outs for M18 and M20. cable length/diameter for field mounting: 200 m / 1. 5 mm2 or 100 m / 1. 5 mm2 (ML7420A6017) NOTE: To avoid malfunction, it is necessary to connect 24 Vac power and ground (see Fig. 3 on page 4). Manual Operation Actuators without spring return are equipped with a manual operation knob used in case of power failure. Manual operation is permitted only after the power supply is switched off or disconnected. To operate, push the manual operation knob down and turn clockwise to move the stem downward and counterclockwise to move the stem upward. If the actuator returns to automatic control, the manual operation knob unlocks automatically. In the case of actuators with spring return, the manual operation knob is located under the cover. Action The direction of action can be reversed by pressing the lefthand pushbutton (W3) located on the printed circuit board (see Fig. 1), If the corresponding LED is lit, this indicates that the actuator stem will retract at a control signal of 0(2) Vdc (factory setting); if it is dark, the actuator stem will extend at a control signal of 0(2) Vdc. Override Option All actuators have an integrated override function (see also Fig. When the override signal is applied, the actuator drives to the fully-open or fully-closed position, regardless of the controller signal. Input Signal Range The range of the analog input signal Y can be changed by pressing the right-hand pushbutton (W2) located on the printed circuit board (see Fig. If the corresponding LED is lit, this indicates that the actuator is set for 0. . . 10 V operation (factory setting); if it is dark, the actuator is set for 2. . . 10 V operation. Spring Return The ML7425A, B spring return actuators provide a defined safety position of the valve in case of power failure. EN0B-0261GE51 R0707 2 ML7420A/ML7425A, B Input Signal Failure Using the potentiometer (W1) located on the printed circuit board (see Fig. 1), the actuator can be adjusted such that in case the signal input fails (due e. g. to a broken wire) or exceeds 12. 5 V, the actuator will run to any pre-configured position between 0% and 100%. [. . . ] ML7420A (left) and ML7425A, B (right), dimensions (in mm) WIRING ML7420A (0/2. . . 10 V) position Y 0(2). . . 10 V 2. . . 10 V 141 ML7425A, B (0/2. . . 10 V) position Y 0(2). . . 10 V 2. . . 10 V Accessory M 24 V override 24 V 24 V~ 1 2 ! override 24 V~ M 24 V 24 V~ 1 2 B safety temperature limiter 24 V 24 V~ 12 S1 3 4 192 100 0 233 100 0 5 S2 6 ! auxiliary switches 250 Vac / 5(3) A Fig. Wiring Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorized Representative: Automation and Control Solutions Honeywell GmbH Böblinger Strae 17 71101 Schönaich Germany Phone: (49) 7031 63701 Fax: (49) 7031 637493 http://europe. hbc. honeywell. com Subject to change without notice. Printed in Germany EN0B-0261GE51 R0707 284 [. . . ]