Delta ECMA-E11315SS + ASD-A2-1521-L — ASDA-A2 Series 1.5 kW Servo Motor and Drive Kit, 2000 rpm / 7.16 N·m, 130mm Frame with Brake

What's in the Box

This kit combines three factory-matched components into a ready-to-install servo system: the ECMA-E11315SS permanent-magnet AC servomotor, the ASD-A2-1521-L servo drive, and a pair of pre-wired 3-metre cables — one for encoder signals, one for motor power. Everything needed to connect motor to drive is included; the only additions required on-site are a 200–230 V AC power source, a circuit breaker sized to the drive's input current, and the mechanical mounting hardware for the motor and load.

The defining feature of this particular kit is the integrated 24 VDC electromagnetic brake on the motor. Unlike the RS-suffix (no-brake) variants of the ECMA-E11315 family, the SS-suffix motor holds its shaft position mechanically when the servo is de-energised — a capability that becomes essential the moment any part of your load has the potential to move under gravity.

Servo Motor Specifications — ECMA-E11315SS

Brake Specifications

The brake is a fail-safe, spring-applied, electrically-released design: it engages automatically when the 24 V supply is removed or lost — including during an E-stop event or power failure. It is not rated for repeated dynamic stopping from full speed; its role is purely to hold position when the servo is off. Any application that uses the brake as a service stop (e.g. stopping a moving axis by cutting brake power) should include external deceleration logic first.

Servo Drive Specifications — ASD-A2-1521-L

The "-L" suffix indicates the base communications configuration: RS-232 for single-axis parameter work with ASD-SOFT, RS-485 for multi-drop or long-cable setups, and USB for direct PC connection. Customers who require a real-time fieldbus can specify the same drive in -M (DMCNET/CANopen), -E (EtherCAT), or -F (EtherCAT + full-closed loop) configurations — the motor is compatible with all four variants.

Why the ECMA-E Series Motor at 2000 rpm?

Delta's ECMA-E series sits in the medium-to-high inertia bracket of the ECMA motor family. The 130mm frame and relatively substantial rotor inertia (11.18 × 10⁻⁴ kg·m² without the brake) make it the right choice when the driven load itself has significant inertia — heavy platens, large rollers, thick cams — and you want natural smoothing of velocity disturbances rather than fighting them purely through gain tuning.

The 2000 rpm rated speed combined with 7.16 N·m gives a continuous power output of 1.5 kW, but the torque-to-speed characteristic matters more in practice. At the drive's rated current of 8.3 A and a KT of 0.87 N·m/A, the motor produces its rated torque without requiring exceptionally high current — which keeps thermal load modest during sustained operation and leaves headroom for the 3× peak torque burst (21.48 N·m) that demanding positioning moves typically demand.

Built-in ASDA-A2 Platform Features

The ASD-A2-1521-L is part of Delta's full-featured ASDA-A2 platform, and as such carries all the drive intelligence built into that generation — not just basic position/speed/torque control.

Electronic Cam (E-CAM): Up to 720 cam table points are stored directly in the drive. Flying-shear, rotary-cut, and synchronised-conveyor applications can be programmed without a dedicated motion controller, using the cam editor built into ASD-SOFT.

PR Mode (Position Register): 64 programmable position registers, each with its own speed, acceleration, deceleration, and dwell settings, can be chained or triggered by digital inputs. This is enough for most indexing, packaging, and assembly tasks without spending budget on an external motion controller.

Automatic Vibration Suppression: Two independent low-frequency vibration suppression filters reduce the residual ringing that appears at the load after a high-speed move — an issue especially common with 130mm-frame motors driving machines with flexible couplings or long ball-screw assemblies.

Auto Notch Filter: Two automatic high-frequency notch filters detect and attenuate mechanical resonance in real time, allowing higher servo gains without triggering oscillation.

Full-Closed Loop (A2-F only): If positioning accuracy at the tool tip — rather than at the motor shaft — is required, the ASD-A2-1521-F variant accepts a second position feedback signal from a linear scale or rotary encoder mounted directly on the load.

Wiring and Installation Summary

The 1.5 kW drive shares the same physical footprint as Delta's 750 W model, making it compact for its power class. Side-by-side cabinet installation with adjacent drives is permitted as long as the minimum clearance specified in the ASDA-A2 manual is maintained. A cooling fan is built in.

The 3m cables included in the kit — encoder and power — use the correct keyed connectors for the ECMA-E series motor. Longer cable runs (up to the maximum specified length) require heavier-gauge power cable and additional EMC filtering; Delta's recommended EMI filter for the ASD-A2-1521 is the RF037B43BA (footprint type). The brake circuit requires a separate 24 VDC supply, which must be kept isolated from the servo drive's control voltage to prevent interference with encoder signals.

Parameter configuration is handled through ASD-SOFT (Windows-compatible, free download from Delta's industrial automation portal), which also includes a built-in oscilloscope function for gain tuning and a motor-sizing module for verifying that the mechanical system falls within the motor's continuous torque and speed envelope.

FAQ

Q1: Does the brake on the ECMA-E11315SS allow this kit to be used on vertical axes?

Yes — and this is precisely the scenario where the "SS" brake variant earns its place over the "RS" no-brake version. When a vertical axis (Z-axis, gantry lift, press ram) loses servo power, gravity pulls the load downward unless something holds it. The spring-applied brake engages automatically with 10.0 N·m of holding torque the moment the 24 VDC supply drops, which is more than enough to hold the motor's rated torque output without back-driving. The important caveat is sequence: the drive should ramp the axis to a stop via servo control first, and then release the brake supply — not use the brake itself as the stopping mechanism, since it is sized for holding, not repeated dynamic braking from speed.

Q2: What is the difference between this kit and the ECMA-E11320RS + ASD-A2-2023-L kit at 2.0 kW?

Three key differences. First, power: this kit is 1.5 kW versus 2.0 kW, with rated torque of 7.16 N·m versus 9.55 N·m. Second, brake: the ECMA-E11315SS includes an electromagnetic brake; the ECMA-E11320RS does not (the RS suffix indicates a keyway shaft without brake). Third, the drives differ — the ASD-A2-1521 for 1.5 kW accepts single- or three-phase input, while the ASD-A2-2023 for 2.0 kW requires three-phase. If you need a braked vertical axis at 1.5 kW, this is the correct kit; if you need 2.0 kW on a horizontal axis without a brake, the RS kit is the lighter and lower-cost option.

Q3: Can the ASD-A2-1521-L drive be connected to a Delta PLC or motion controller for coordinated multi-axis control?

The -L suffix drive uses RS-485 and can be polled by a Delta DVP-series PLC through the MODBUS protocol, but it does not support synchronised real-time axis coordination over that interface. For tightly coupled multi-axis control — electronic gearing, camming across axes, or interpolation — the preferred approach is to upgrade to the -M suffix (CANopen/DMCNET) or -E suffix (EtherCAT) variant of the same drive, which then integrates with Delta's DVP-MC or AX motion controllers. The motor and cables remain identical regardless of which drive suffix is chosen.

Q4: What external components are not included in the kit?

The kit covers motor, drive, encoder cable, and power cable. You will additionally need: a 24 VDC power supply for the brake circuit (the drive's control circuit supply does not power the brake directly); a correctly rated circuit breaker and fuse on the AC input; an EMI filter if CE compliance is required; and mounting hardware for both the motor and the drive panel. For vertical-axis applications, a 24 VDC safety relay or brake controller is strongly recommended to ensure the brake engages in the correct sequence during E-stop events — cutting drive power and brake power simultaneously without a controlled deceleration first can cause the load to drop briefly before the brake catches.

Q5: Is the 20-bit encoder on the ECMA-E11315SS compatible with controllers other than the ASD-A2 drive?

No — the 20-bit incremental encoder on the ECMA-E series motors uses Delta's proprietary serial communication protocol, not a standard quadrature (A/B/Z) output. The encoder interface is designed exclusively for ASD-A2 series drives. If you need to connect this motor to a third-party motion controller, you would need to use a different motor with a standard quadrature encoder output, or use the ASD-A2 drive as a slave device receiving commands from the controller over RS-485, CANopen, or EtherCAT — which is the intended and supported integration method for this product.