Power supply and motor brake

Pinout Power Terminal

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Terminal #  
1 Phase A
2 Phase B
3 Phase C
4 Phase D - Brake output 0-48 V PWM
5 Ground
6 Main Power Supply 12-48 V
7 Optional Logic Ground
8 Optional Logic Supply 12-24 V *

* not connected by default. Upon request only, please contact sales@synapticon.com

Important

The motor and power cables must be twisted for EMC reasons.

Note

SOMANET Servo Nodes are densely packed with high-performance components. Even at idle/torque off, several components such as power supplies, cause the Node to get warm, especially when it’s not connected to any heat conducting structure. The SOMANET Servo Nodes’ power stages and control algorithms were optimized for efficiency at high power output and actually make them one of the most efficient servo drives available. The heat generation is not linear, which makes it actually more noticable at idle or low power. Please ensure by design of your mounting situation that the heat interface is connected to sufficient structure to appropriately dissipate generated heat.

Using a PELV or SELV power supply

It’s recommanded to use a protected extra-low voltage supply (PELV) instead of a safety extra-low voltage supply (SELV).

If a SELV is used, it’s possible that the isolation from the earth can be violated through our drive (e.g. through heatsink or mechanical mountings) and the supply becomes PELV.

Warning about using contactors behind the power supply

Attention

Our Servo Nodes are designed for voltages between 12 V and 48 V (60 V Max), they should be run with an appropriate extra-low voltage supply. Please do not use contactors behind the power supply since the transient-voltage-suppression diodes could get damaged due to the power-up voltage increase (Surge). This is likely to happen when the power up occurs fast and can lead to complete failure of your Servo Node.

If contactors behind the power supply are used, it’s necessary to include an uni-directional TVS diode type 1.5KE62A-E3/54* between Main Power Supply and Ground of the terminal.

* this model has been successfully tested by Synapticon. Other products with the same specifications may also be appropriate but can’t be recommended.

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In case you are running several Servo Nodes behind a contactor, please use an uni-directional TVS diode on each Node because of the inductances of the wiring.

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Connecting a Brake

If your system has an attached brake, please connect the brake cables to Phase D and Ground. These two threads should be twisted together or at least be paired to have a minimum area between them.

By default, Logic Supply is deactivated, it is therefore recommended to use Logic Ground (pin 7 of the Main Supply Connector) for the brake.

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If Logic Supply is active, Ground of the brake can be connected to the Ground cable of the 48V power supply in a spot close to the board or it can be connected together with the Ground of the 48V supply to the pin 5 of the Main Supply connector if they fit in there.

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Important

Please make sure the node is properly grounded.