Precision Motion Control User Manual Compact Ring Drive Product Family: PL - Planetary Gearbox HG - Harmonic Gearhead DD - Direct Drive MRS - Motor Ready Sealed MRG - Motor Ready Guarded MRO - Motor Ready Open

In accordance with Nexen's established policy of constant product improvement, the specifications contained in this manual are subject to change without notice. Technical data listed in this manual are based on the latest information available at the time of printing and are also subject to change without notice. This document is the original, non-translated, version. Conformity Declaration: In accordance with Appendix II B of CE Machinery Directive (2006/42/EC): A Declaration of Incorporation of Partly Completed Machinery evaluation for the applicable EU directives was carried out for this product...

General Safety Precautions ---------------------------------------------------------------------------------------------------- 4 System Design Overview ------------------------------------------------------------------------------------------------------- 5 Mounting Surface Details ------------------------------------------------------------------------------------------------------- 6 Installation Instructions ---------------------------------------------------------------------------------------------------------- 7 Installation Instructions: Optional Brake-----------------------------------------------------------------------------------...

WARNING Deadly voltages can occur. Risk of electric shock. Check that all live connection points are safe against accidental contact. WARNING Ensure proper guarding of the product is used. Nexen recommends the machine builder design guarding in compliance with OSHA 29 CFR 1910 “Occupational Safety and Health Hazards”. DANGER This product has moving parts that can crush or cut appendages. Provide adequate spacing or guarding from any operating product. WARNING Always make sure that the motors are de-energized during assembly and wiring. Risk of electric shock. WARNING Never undo the electrical...

SYSTEM DESIGN OVERVIEW General System Requirements • Make sure the machine design is rigid enough to avoid deflection that could affect the ring drive system. Large temperature swings can affect performance of the CRD; ideal ambient temperature range is -5°C to 40°C (23°F to 104°F) • Exposed surfaces of the CRD are treated with hot black oxide, therefore will have moderate corrosion resistance. Review surface treatment product specifications for corrosion resistance performance, and determine whether the CRD system is suitable for your application based on your familiarity with the corrosion...

MOUNTING SURFACE DETAILS The surface used to mount the CRD should be machined to a flatness of .050 mm as shown to ensure proper alignment. See Figure 2. All provided provisions for fasteners should be utilized. Make sure there is proper clearance around the drive station and air line/cable slots (if being utilized) as shown in Figures 1 & 2. NOTE: MRO units do not have air line/cable slots. Drive Station Clearance Required

1. Position the ring drive on the customer supplied mounting surface. The CRD can be lifted using the stationary threaded holes or stationary mounting holes. If equipped with a brake the driven output threaded holes can be used. See Figure 3. 2. Once the ring drive is in location, install the mounting bolts to secure to the mounting surface. Tighten the bolts in a star pattern to ensure even distribution of load. Nexen recommends using class 12.9 bolts for any application, although it is the customer’s responsibility to ensure the mounting is suitable for the system loads. Motor Mounting (pl,...

Component Mounting to CRD Output Customer components should be mounted using all available holes. Tighten in a star pattern to ensure even load distribution. It is the responsibility of the customer to ensure the bolt grade and qty is sufficient for the application. Dial Plate Mounting The dial plate is designed to be piloted by a series of dowel pins installed in the plate that straddle the output pilot on the ring drive. Drawings showing this method of piloting are available for each specific size. The dial plates should be mounted using all available holes and supplied fasteners. It is the...

Brake (if equipped) The static holding brake is a factory installed accessory, braking directly on the driven output. Brake Air Connections All Nexen pneumatically actuated devices require clean and dry air, which meet or exceeds ISO 8373.1:2001 Class 4.4.3 quality. Air Supply Typical Brake Control Circuit Gauge Filter Dryer Regulator 3/2 (3 Way) T-n N.C. Valve Quick Exhaust Valve AIR PRESSURE: 8.3 BAR (120 PSI) ABSOLUTE MAX 4.1 BAR (60 PSI) MIN TO ACTUATE 0 BAR (0 PSI) ABSOLUTE MIN The CRD Brake is equipped with the following ports: Refer to Figure 6. - Spring Engaged / Air Disengaged: Port...

The pinion needle bearings are sealed and lubricated for life, and therefore cannot be serviced. Gear - sealed units (pl, hg, dd, mrs) The gear is lubricated for life, and cannot be serviced. Gear - open units (mrg, mro) Nexen recommends lubricating the gear teeth every 2 million pinion revolutions or 6 months, but it may need to be lubricated more frequently based on the application conditions, and observable tooth or roller wear. THK AFA grease is recommended for gear tooth lubrication. Nexen offers this grease under product number 853901. Greases for special applications such as food grade,...

Power Connector Suggested Mating Connector Intercontec BSTA-108-NN-00-08-0036-000 Feedback Connector (View facing front) Suggested Mating Connector Intercontec ASTA-035-NN-00-10-0035-000

Motor Specifications The following are motor-only specifications for use in motor files and drive setup. See “CRD Application & Selection Guide” for system specifications. Motor Winding Configuration When CRD output is rotated CCW, these waveforms result: Voltage U, Leads V, Leads W Voltage U-W leads Voltage V-W by 60° electrical. Embedded Thermistor PTC thermistor (155°C ± 5°C switching temperature) installed. Resistance at 25°C < 550 ohms. Switching Resistance: > 1330 ohms within ± 5°C of switch temperature.