Product News

SANYO DENKI Develops Industry's Smallest
SANMOTION R 400 VAC Input Multi-axis Servo Amplifier for High-capacity Servo Motors

October 28, 2020

SANYO DENKI CO., LTD. has developed and released the SANMOTION R 400 VAC input multi-axis servo amplifier.
This servo amplifier can smoothly operate 20 to 37 kW large-capacity servo motors, and is suitable for applications such as machine tools and injection molding machines.
It also has functions for estimating equipment faults from amplifier and motor operating history.



1. Smallest Size in the Industry(1)

Variations of the control, power supply, and amplifier units are available for selection to build multi-axis servo amplifiers that best suit user requirements.
With the smallest size in the industry, this amplifier provides a high degree of freedom, contributing to downsizing of user equipment.


2. Smooth Motion

Compared with our current model,(2) speed frequency response has been doubled(3) and EtherCAT communication cycle has been shortened to half(4) to achieve smoother motor motion. This contributes to shortening the cycle time of user's equipment and increasing productivity.

3. Preventive Maintenance

This servo amplifier features a function to monitor motor holding brake wear and notify users of replacement timing. It also has a power consumption monitoring function for regenerative resistors and a communication quality monitoring function. These contribute to preventive maintenance and remote failure diagnosis of user equipment.

(1) Based on our own research as of October 28, 2020.

(2) Comparison with our current model RM2C4H4.

(3) Speed frequency response 2,200 Hz (1,200 Hz for the current model)

(4) Minimum communication cycle 62.5 μs (125 μs for the current model)


Control unit

Model no. RM3C1H4
No. of controllable axes 1
Interface EtherCAT
Functional safety STO (Safe Torque Off)
Dimensions [mm] 90 (W) × 180 (H) × 21 (D)

Power supply unit

Model no. RM3PCA370
Input voltage and current Main circuit power supply 3-phase 380 to 480 VAC (+10, -15%), 50/60 Hz (±3 Hz)
Control circuit power supply 24 VDC (±15%), 4.6 A
Rated output capacity 37 kW
Input capacity 64 kVA
Compatible amplifier unit 25 to 600 A
Dimensions [mm] 180 (W) × 380 (H) × 295 (D)

Amplifier unit

Model no. RM3DCB300 RM3DCB600
Input voltage and current Main circuit power supply 457 to 747 VDC
Control circuit power supply 24 VDC (±15%), 2.2 A 24 VDC (±15%), 2.6 A
Amplifier capacity 300 A 600 A
Compatible motor 20 to 30 kW 37 kW
Compatible encoder Battery-less absolute encoder
Dimensions [mm] 250 (W) × 380 (H) × 295 (D) 250 (W) × 380 (H) × 295 (D)

PDF Catalog

English [414KB]

Japanese [478KB]


Injection molding machines, machine tools

Release Date

December 18, 2020



Note: The information stated in this release is current as of October 28, 2020.
“SANMOTION” is a trademark of SANYO DENKI CO., LTD.

This site uses cookies to improve service.
By continuing to browse the site you are agreeing to our use of cookies.

Website policy