User manual HONEYWELL ML7421B DATASHEET

[. . . ] 1 mA Wiring Wiring terminals 1. 5 mm2 Cable entry M20x1. 5 and knock-out for PG11 Material Cover ABS-FR Yoke and Base Aluminum diecast Weight 2. 0 kg Dimensions see Fig. 4 GENERAL These actuators enable modulating control in conjunction with controls providing an analog output. The direction of movement is reversible by means of an internal selector plug. [. . . ] The factory set is: stem extends at increasing signal (direct acting). NOTE: Jumper plugs W1, W2, W3, and W4 are accessible after the cover has been removed. They are located on top side of the printed circuit board (see Fig. 2). Manual Operation The actuators are equipped with a manual operator used in case of power failure. Manual operation is possible only after the power supply has been switched off or disconnected. To operate, push the manual operator knob down and turn clockwise to move the stem upward and counter-clockwise to move the stem downward. If the actuator returns to automatic control, the manual operator knob unlocks automatically. NOTE: Manual operation allows a very high closing force capable of jamming the actuator spindle and exceeding the rating of the force switches, so that the motor cannot move. Therefore, after a manually close-off operation, it is necessary to release the spindle one turn by turning the manual operator knob, thus ensuring that the manual operator will automatically disengage on power resumption. W2 W3 W1 W4 Fig. Location of jumper plugs W1, W2, W3, W4 Electrical Installation 24 V and 24 V (see Fig. 3. ) must be applied under all operating conditions. Cable length/diameter for field mounting: · Max. 200 m / 1. 5 mm2 Input Signal The Vdc- or mA-input signal is selected by shifting jumper plug W4 (see Fig. The factory setting of W4 is "Vdc". No external resistor for mA-input signal is necessary. EN0B-0416GE51 R0409 2 ML7421A, B ELECTRIC LINEAR VALVE ACTUATORS W2 W3 W4 · 0%: actuator stem position for 0(2) Vdc · 50%: actuator stem in central position · 100%: actuator stem position for 10 Vdc The factory setting of W1 is "50%". V 2. . . 10 V 4. . . 20 mA 0. . . 10 V 0. . . 20 mA 10 V 20 mA 10 V 20 mA mA Accessories The following accessories are available upon request. W1 Y Y W4 = V W3 = 10 V, 20 mA W4 = V W3 = 10 V, 20 mA Auxiliary Switches The actuators can be equipped on-site with an auxiliary switch unit with two switches. Their switching points are adjustable over the full length of the actuator stroke. [. . . ] ML7421B (dimensions in mm) Wiring 0. . . 10 V / 0. . . 20 mA 2. . . 10 V / 4. . . 20 mA 10 V / 20 mA 10 V / 20 mA W2 W3 M position Y 24 V 24 V 24 V ~ 1 2 W1 W4 }0(2). . . 10 V 0(4). . . 20 mA 2. . . 10 V } Y-signal override 24 V~ 204 1 2 3 301 326 4 5 V mA 00 % 50 0 100 0 Fig. Wiring ML7421A, B S1 S2 auxiliary switches 24 Vac / 5 (3) A Fig. Accessories Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Rolle, Z. A. [. . . ]