Product Description
Everest S Safe NET (EVS-S-NET-E) is a Functional Safety certified high-power, highly integrated, low profile, digital servo drive intended to be plugged or soldered to an application-specific daughter board. The drive includes advanced Functional Safety features, such as FSoE (Safety over EtherCAT) communication, Safe Stop Safe Torque Off and Safe Input. It offers best-in-class energy efficiency thanks to its state-of-the-art power stage. The product is based on EtherCAT communication and can be easily configured with the Novanta Drives' free software MotionLab 3.
Main features:
Ultra-small footprint
Functional Safety: STO, SS1, SI, FSoE - SIL3 and PLe certified
Up to 60 VDC, 45 A continuous
Up to 99% efficiency
Up to 50 kHz current loop, 25 kHz servo loops
10 kHz ~ 100 kHz PWM frequency
16-bit ADC current sensing
Supports Digital Halls, Quadrature Incremental encoder, Absolute BiSS-C encoder
Up to 4 simultaneous feedback sources
Full voltage, current, and temperature protections
Capable of controlling low inductance motors
Target applications:
Collaborative robot joints
Robotic exoskeletons
Medical applications
AGVs and AMRs
Humanoid robot joints
Page contents
Part numbering
Product | Ordering part number | Status | Image |
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Everest S Safe NET Functional Safety certified pluggable servo drive with EtherCAT communication. | EVS-S-NET-E | IN DESIGN | ![]() |
General Label Identification |
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Specifications
Electrical and Power Specifications
Minimum absolute DC bus supply voltage | 8 VDC |
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Maximum absolute DC bus supply voltage | 60 VDC |
Internal drive DC bus capacitance | 20 µF Note that EVS-S-NET-E uses ceramic capacitors. The capacitance value varies with DC bias and temperature. |
Logic supply voltages | Recommended voltage range is 5 V ± 2% (4.9 VDC ~ 5.1 VDC). Maximum voltage in case of external failure 25 V. A minimum of 500 mA should be provided. Higher current may be needed depending on the feedbacks used. Rise time of the 5 V supply must be between 2 ms and 10 ms to guarantee a proper initialization. |
Boot-up time | 4 s |
Minimum shutdown time | 500 ms |
Output reference voltages | 3.3 V ± 0.2%, 10 mA source / sink capability |
Maximum continuous phase current | 45 A @ 60 ºC Typically, 45 A can be obtained working at 48 V, 20 kHz with an appropriate cooling to keep case temperature under 60 ºC. On higher temperatures an automatic current derating will be applied to protect the system. See Thermal and Power Specifications.. |
Maximum peak phase current | 60 A @ 1 sec Notice that peak current could be limited by an automatic current derating algorithm. |
Maximum continuous output power | > 3 kW For more information, please see How to calculate the output power of a Servo Drive |
Maximum DC Bus voltage utilization | 99.73% @ 10 kHz 99.55% @ 20 kHz 99.04% @ 50 kHz 95.25% @ 100 kHz Note: The values assume a Sinusoidal commutation and no load connected. |
Minimum Standby Consumption | 1.85W typ. See details and conditions in Thermal and Power Specifications below |
Motion Control Specifications
Supported motor types | Rotary brushless (SVPWM and Trapezoidal) |
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Power stage PWM frequency (configurable) | 10 kHz, 20 kHz (default), 50 kHz, 100 kHz |
Current sensing | 3 phase, shunt-based current sensing. 16-bit ADC resolution. Accuracy is ±2% full scale. |
Current sense resolution | Current gain is configurable in 3 ranges:
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Current sense range | Current ranges for the 3 configurable current gains:
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Max. Current loop frequency (configurable) | 50 kHz Check the Power Stage & Control loops relationship section below. |
Max. servo loops frequency (position, velocity & commutation) (configurable) | 25 kHz Check the Power Stage & Control loops relationship section below. |
Feedbacks |
All feedback inputs are single-ended, 3.3 V logic levels. Check Safe Feedback section. The following feedback protocols are supported and can be used outside of the Functional Safety certification (Phase 2):
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Supported target sources | Network communication: EtherCAT with Safety over EtherCAT (FSoE) |
EtherCAT |
Magnetic and capacitive connections supported |
Control modes |
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Functional Safety Specifications
This product is certification pending. Until receiving the certificate any content in this section is subject to change.
EVS-S-NET-E Safe Communication (already implemented) | EVS-S-NET-E Safe Motion (future release) | |
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Safety functions |
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Safe Feedback | Not Supported | Safe Feedback with the combination of 2 individual encoders:
See Safe Feedback Combinations (DEN-S-NET Safe Motion - future release) for further details. |
Safe Output | None | 1 x Redundant Safe Output. Logic level, active-low. Designed to be used with an external SBC (Safe Brake Control). |
Safety Integrity Level (SIL) according to IEC 61508:2010 | SIL3 | |
Performance Level (PL) according to ISO 13849-1:2015 | PLe, Cat. 3 | |
Safety Function Reaction Time | ≤ 25 ms | |
Safe inputs | 1 x Redundant Safe Input. Non-Isolated. Logic level (3.3 V and 5 V tolerant). Active-low. | |
Command Source |
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FSoE cycle time | ≤ 50 ms | |
Standards compliance | Targeted standards (certification pending):
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Safe Feedback Combinations (EVS-S-NET-E Safe Motion - future release)
The section below is relevant to the future implementation of the EVS-S-NET-E drive offering Safe Motion features.
This product is certification pending. Until receiving the certificate any content in this section is subject to change.
Everest S Safe NET can provide advanced Safe Motion functions by using two individual non-certified encoders:
Feedback Combination | EVS-S-NET-E Safe Communication (already implemented) | EVS-S-NET-E Safe Motion (future release) | |
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Safe Feedback 1 | Safe Feedback 2 | Safety Functions allowed | |
- | - | STO, SS1-t, and SI | STO, SOUT, SS1-t, and SI |
BISS-C BP3 - Port 1 | BISS-C BP3 - Port 2 | N/A | STO, SOUT, SS1-t, and SI Safe Velocity Functions: SS1-r, SAR, SLS, SSR, SDI, SV Safe Position Functions: SS2-r, SS2-t, SOS, SLP, SLI, SP |
BISS-C BP3 - Port 1 | QEI | N/A | STO, SOUT, SS1-t, and SI Safe Velocity Functions: SS1-r, SAR, SLS, SSR, SDI, SV Safe Position Functions: SS2-r, SS2-t, SOS, SLP, SLI, SP |
Digital Halls | BISS-C BP3 - Port 2 | N/A | STO, SOUT, SS1-t, and SI Safe Velocity Functions: SS1-r, SAR, SLS, SSR, SDI, SV Safe Position Functions: SS2-r, SS2-t, SOS, SLP, SLI, SP |
Digital Halls | QEI | N/A | STO, SOUT, SS1-t, and SI Safe Velocity Functions: SS1-r, SAR, SLS, SSR, SDI, SV Safe Position Functions: SS2-r, SS2-t, SOS, SLP, SLI, SP |
Note: To guarantee enough diversity, the encoders must be of different technology or manufacturer.
Note: Other feedback combinations can be used for Motion Control purposes out of Functional Safety certification.
Environmental Conditions
Environmental test methods | IEC 60068-2 |
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Case temperature (Operating) | -20 ºC to +70ºC |
Ambient temperature (Operating) | -20 ºC to +60 ºC |
Case and Ambient temperature (Non-Operating) | -40 ºC to +100 ºC |
Altitude (Operating) | < 2000 m above sea level. |
Vibration (Operating and Non-operating) | 10 Hz to 150 Hz, 1 g |
Mechanical Shock (Operating and Non-operating) | ±5g Half-sine 30 msec |
Maximum Humidity (Operating) | up to 93%, non-condensing at 60 ºC |
Maximum Humidity (Non-operating) | up to 93%, non-condensing at 60 ºC |
Over-voltage category | II |
Inputs/Outputs and Protections
General purpose Inputs and outputs | 4x non-isolated single-ended digital inputs - 3.3 V logic level. Can be configured as:
4x non-isolated single-ended digital outputs - 3.3 V logic level, 3 mA max. sink / source current. Can be configured as:
2x ±3.3 V ,16-bit, differential analog inputs for load cells or torque sensors. Can be read by the Master to close a torque loop. 1x 0.3 V ~ 3 V, unbuffered analog output. |
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Safe Inputs | 1 x Redundant Safe Input. Non-Isolated. Logic level (3.3 V and 5 V tolerant). Active-low. |
Dedicated digital output | Dedicated 3.3 V digital output for Fault Signal status. |
Shunt braking resistor output | Configurable over any of the digital outputs (see above). Enabling this function would require an external transistor or power driver. |
Motor brake output | Dedicated, PWM-capable, 3.3 V digital output for driving a mechanical brake. Turn-on and turn-off times are configurable. Enabling this function would require an external transistor or power driver. |
Motor temperature input | 1x dedicated, 5 V, 12-bit, single-ended analog input for measuring motor temperature. NTC, PTC, RTD, linear voltage sensors, silicon-based sensors and thermal switches are supported. |
Protections |
The configurable protections are configurable up to the drive limits. In any case when the limits are reached, the drive is completely switched off with the current reduced to 0.
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Over-current | An overcurrent device in series (i.e. fuse or similar) is needed with a rating of maximum x3 of the max current of the motor on the system and a minimum voltage rating of 60V. Consider Vbus overshoots and reinjections to dimension the protection accordingly. |
Communication for Operation
EtherCAT | CANopen over EtherCAT (CoE) File over EtherCAT (FoE) Ethernet over EtherCAT (EoE) Failsafe over EtherCAT (FSoE) Magnetic and capacitive connections supported |
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Mechanical Specifications
Dimensions | 37x 28.5x 17.14mm |
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Weight | 28g |
Compliance
EC Directives |
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Electromagnetic Compatibility (EMC) Standards |
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Product Safety Standards |
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Functional Safety Standards | See section Functional Safety Specifications |
Environmental Test methods | IEC 60068-2:
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Thermal and Power Specification
Standby power consumption
The following table shows the standby power consumption when the Everest S Safe power stage is disabled assuming 2 EtherCAT/Ethernet port is active and communicating at full speed, no feedbacks or I/Os are connected. At this point the power consumption comes from the 5 V supply input only. The table also shows the "active standby" dc bus power consumption when the power stage is enabled, motor current is set to 0 and housing temperature is kept at under 70 ºC.
Power supply voltage | Standby 5 V logic supply consumption | Power stage DC bus consumption switching at 0 current | |||
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10 kHz | 20 kHz | 50 kHz | 100 kHz | ||
8 V | 1.94W (logic supply consumption does not depend on bus voltage) | 0.01W | 0.02W | 0.05W | 0.10W |
48 V | 0.22W | 0.42W | 1.00W | 1.97W | |
60 V | 0.32W | 0.60W | 1.45W | 2.85W |
Thermal model
The Everest S Safe NET is designed to be mounted on a cooling plate or heatsink to achieve its maximum ratings. In order to calculate the heatsink requirements, the power dissipation can be estimated below.
In some low power applications, the Everest S Safe NET is NOT required to be mounted to any heatsink. In this case its thermal resistance from housing/case to ambient Rth(h-a) can be estimated between 8 K/W, to 12 K/W assuming 10 cm clearance to allow air convection at sea level. Typically 7 W can be dissipated without heatsink, refer to the graph below to know which current can be handled.

*Product shown differ from Everest S NET.
Power Stage & Control loops relationship
The power stage PWM frequency can be adjusted in 4 different frequencies. Each frequency has an associated rate for the control loops, as specified in the following table.
Power stage PWM frequency | Current loop frequency | Servo loops frequency (position, velocity, commutation & shunt) |
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20 kHz | 20 kHz | 20 kHz |
50 kHz | 50 kHz | 25 kHz |
100 kHz | 50 kHz | 25 kHz |
200kHz | 50 kHz | 25 kHz |