Clarification on OTPS Output Voltage and Power Enclosure Input Specification

Blue Robotics Products Outland Technology Power Supply
1

Hello,

My name is Alfin , and I am currently working on a project that references the OTPS system from Blue Robotics.

I have read through the OTPS product specification and noticed that the output from the topside unit is listed as 400VDC. However, in the Power Enclosure documentation, the input voltage is stated as 200VDC.

Screenshot 2025-05-27 194658
Screenshot 2025-05-27 194658790Ă—291 40.7 KB

I would like to ask for clarification regarding this point:

  1. Is the 200VDC input voltage stated in the Power Enclosure manual accurate?
  2. If so, does this mean the Power Enclosure can only accept 200VDC, or is it capable of handling up to 400VDC as well?

I appreciate your time and assistance in clarifying this matter, as it is crucial for ensuring compatibility and safety in our project design.

Looking forward to your response.

Best regards,
Alfin

2

Hi @Alfin,

A voltage is a relative electrical potential, and the conventional zero point of any circuit is a point specified as “ground” (or “earth”).

As is shown in the picture you included, pin 3 is connected to the chassis of the power enclosure, which is considered (for that system) to be the ground. Pin 1 is then +200 VDC (above the chassis ground level), and Pin 2 is -200 VDC (below the ground level), so there is a maximum potential between the chassis and any wire of 200 V, but the power being provided through the two high voltage wires is at 400 VDC (relative to each other).

This kind of split improves the safety of the system, because it makes it harder for anything outside the cable to be exposed to the full 400 V, even if the cable gets partially cut.

By the way, I’ve made your message into a public post, as this kind of information is relevant to the whole community :slight_smile:

4 Likes
4

Hello @Eliot,
I have an OTPS power enclosure, and I’m planning to test it using an external power supply that outputs ±200VDC and GND (total differential of 400VDC), which I believe matches the OTPS input voltage requirement.

I have a couple of questions:

  1. Is it safe and acceptable to use a ±200VDC + GND power supply to power the OTPS system?
  2. If so, what is the voltage tolerance range (maximum and minimum input voltage) that the OTPS can safely accept?

I want to make sure I’m not risking damage to the OTPS by supplying it with this voltage, especially for long-term operation.

Thanks in advance for your insights!

5

Hi @Alfin -

Using a non-OTPS 400V power supply with the same subsea power enclosure seems quite risk! DOes your power supply have the appropriate safety cutoff systems? Blue Robotics can’t encourage this type of combination because of the inherent high-voltage risks involved… I’d recommend reaching out to Outland Technologies for feedback!