HZ171A607 by Danaher

The HZ171A607 is an electromechanical preset counter supplied by Danaher within the Timers and Controllers series. Used in industrial automation panels, it drives a mechanical index shaft to start or stop downstream equipment once a preset tally is reached. By energizing an internal stepping motor and clutch, the product advances through counts and opens or closes an external relay when the preset is met. Its front dial provides a quick way to establish a target without programming software.

The counter operates from a single-phase input of 120 VAC. Inside, the stepping motor completes each increment within 40 ms, while the clutch fully engages after 50 ms. At steady state, the mechanism can register up to 500 counts/min with a count accuracy of 100%. This accuracy supports a one-to-one relationship between accepted input pulses and mechanical increments. The output relay can switch resistive loads up to 10 A at the same mains voltage, permitting direct connection to small heaters, solenoids, or contactors. During operation, the front-bezel dial lock prevents vibration or incidental contact from changing the preset, and the wheel offers a maximum count setting of twelve.

After a batch is completed, the reset solenoid clears the wheel within 500 ms, and the drive remains idle for 80 ms before the next on-pulse arrives. While the mechanism is held, the clutch imposes a 10.5 VA burden, and motor startup draws 26 VA. The electrical burden differs by operating state because the clutch and motor are energized at different points in the cycle. The assembly withstands ambient temperatures up to 60 °C. The housing measures 96.82 mm wide and 107.95 mm high, with a depth of 146.05 mm. The width and height determine front-panel spacing, while the depth establishes the required clearance behind the enclosure door.