New Tosoku Manual Electric Pulse Generator RE45BA1R5 High Voltage

Tosoku RE45BA1R5 | Manual Pulse Generator — 5V, 100 PPR, Voltage Output, 80mm Dial, 3-Nut Panel Mount, Optical Encoder, Made in Japan

Overview

The Tosoku RE45BA1R5 is a panel-mount optical manual pulse generator (MPG) from Tosoku's RE45B series — a product line developed specifically for NC machine tool applications and built to the exacting standards that Tosoku's Japanese manufacturing operation has maintained across decades of machine tool OEM supply.

At 100 PPR with a 5V voltage output, the RE45BA1R5 is among the most widely specified MPG variants in CNC operator panels, covering the combination of resolution, supply voltage, and output format required by the majority of Fanuc, Mitsubishi, Siemens, and equivalent CNC systems.

The manual pulse generator is the interface between the operator's hand and the machine's servo axes. When an operator needs to move a machine axis without running a program — jogging a tool to a reference point, setting a workpiece origin, verifying clearance before a first cut, or repositioning after a tool change — the handwheel is the tool that makes it possible to do this with the kind of fine, tactile control that a jog button cannot provide.

Each click of the RE45BA1R5's dial generates one or a defined multiple of encoder pulses; combined with the CNC's magnification factor setting (×1, ×10, ×100), the operator can dial in positioning increments ranging from microns to millimetres per detent.

Tosoku's RE45B series uses optical sensing technology — an internal light source and photodetector read an optical disc pattern, converting physical rotation into clean quadrature pulse output.

The optical sensing mechanism is the reason Tosoku can specify 100 PPR with the low noise and consistent detent feel that machine tool applications demand.

The RE45BA1R5's 80mA current draw at 5V is a modest load on the CNC control's operator panel power supply, and the voltage output (R designation) is directly compatible with the 5V digital input circuits found on standard CNC machine tool operator interfaces.

The 80mm diameter dial gives the operator a comfortable hand grip during fine positioning work, and the panel mount via three nuts secures the unit robustly to the machine operator panel regardless of vibration from the machine tool's spindle and servos.

The RE45B series has been designed as a direct installation product: it arrives ready to mount, requiring only wiring to the CNC's MPG input.

Key Specifications

RE45B Series — Voltage Output vs Other Output Options

The RE45B series is available in three output configurations: voltage output (R), open collector (O), and differential line driver (D).

The RE45BA1R5 uses the R (voltage output) option, which produces standard 5V logic high / logic low square wave signals on the A and B phase outputs, 90° out of phase with each other. This output format is directly compatible with most CNC MPG input circuits that accept 5V TTL or CMOS logic levels.

Open collector (O) output requires pull-up resistors at the receiving circuit and is used in applications where the interface voltage level must be set by the pull-up supply rather than the encoder supply.

Differential line driver (D) output provides paired true/complement signals for each phase, offering the best noise immunity over longer cable runs.

For standard panel installations where the MPG is mounted directly on the machine operator panel and cables run less than a few metres to the CNC unit, voltage output is entirely adequate and simplifies the wiring design.

Manual Pulse Generator in the CNC Workflow

The RE45BA1R5 connects to the machine's CNC via the operator panel's MPG input — typically a dedicated connector on the CNC's interface module or a machine-side interface board. Before use, the CNC's axis selection switch directs handwheel pulses to the desired axis (X, Y, Z, or an additional axis), and the magnification selector determines how many micrometres of movement each encoder pulse commands.

At ×1 (1µm per pulse on a typical Fanuc configuration), 100 pulses per revolution means one full rotation of the dial moves the axis 0.1mm — a resolution that makes it easy to set a tool touching on a workpiece surface to within a few microns.

This combination of tactile feedback from the dial's detent and the CNC's precise position measurement closes the loop between the operator's intent and the actual machine position in a way that incremental jog buttons simply cannot match.

FAQ

Q1: What is the difference between the RE45BA1R5 and the RE45BD1R5 variant?

Both are 5V 100PPR voltage output RE45B encoders, but they differ in mounting and dial configuration.

The A-type has a φ80mm dial and is mounted via 3 nuts on the panel.

The D-type is a dial-free variant (D = Without Dial), typically used in custom handwheel assemblies where the machine builder provides their own housing and knob.

For a standard panel replacement, the RE45BA1R5 is the correct variant; the RE45BD1R5 would require the builder to supply a separate handle assembly.

Q2: Is the RE45BA1R5 compatible with Fanuc, Mitsubishi, and Siemens CNC systems?

Yes. The RE45BA1R5's 5V voltage output A/B quadrature signal is the standard MPG interface format supported by all major CNC platforms including Fanuc (Series 0i, 16i, 18i, 21i, 31i), Mitsubishi (M800, M700 series), Siemens (840D sl, 828D), and many others.

The CNC's MPG interface must supply the RE45BA1R5's 5V DC operating power — confirm the pin assignment of the CNC's MPG connector against the RE45BA1R5's wiring diagram before installation, as pin numbering varies between CNC brands.

Q3: The RE45BA1R5 is rated 80mA at 5V — does this place any load concern on the CNC operator panel supply?

80mA at 5V represents 0.4W — a very modest load on any modern CNC's operator panel power supply, which is typically rated for several hundred milliamps at the MPG supply output. No additional current limiting or buffering is required.

If multiple MPGs are installed on the same panel supply (e.g., separate handwheels for the machine control panel and a remote jog pendant), add the total current draw from all MPG units and confirm the CNC's MPG supply output can handle the combined load.

Q4: How is the RE45BA1R5 mounted on the operator panel, and what panel cutout is required?

The RE45B A-type mounts through the operator panel via a circular opening.

The encoder body passes through the opening from the rear of the panel, and three nuts on the front secure the unit against the panel face.

The required panel cutout diameter and panel thickness range (t = 3mm max for the standard RE45B) are specified in Tosoku's dimensional drawing for the RE45B A-type.

The 80mm dial projects from the front face of the panel.

Q5: What is the service life of the RE45BA1R5, and is it field-repairable?

Tosoku's optical MPG products are designed for long operational life in machine tool environments.

The unit is not designed for field repair — if a RE45BA1R5 fails due to optical disc contamination, bearing wear, or electronic damage, the standard service action is replacement with a new unit.

Given the relatively low cost of a replacement MPG compared to the machine downtime a failed handwheel causes, maintaining one spare in the machine's parts kit is a common and practical approach.