Output Connection Methods with Parallel Control

Posted on: June 23rd, 2021 by Doug Lovell

Parallel operation is very useful to expand an output capacity; especially master-slave parallel operation allows you to control an entire system by one master unit.
When making the master-slave connection such as signal wiring and load connection, you may find some issues with load connection. Improper connection may cause oscillation so that our user’s manual describes how to connect the load.
In this article, you will learn not only the basic connection methods also the advanced techniques to stabilize an unstable output, which can apply to almost all our DC power supplies (except for high-speed power supply PBZ Series).
1. Basic Connection Methods
1) Make the cable connection between the master/slave units and DUT as short as possible and each connection should be the same length; In Figure 1, the cable connection L1, L2 and L3 should be the same length and then connect them to the DUT as short as possible.
2) If the above cable length is too long, connect the master/slave units to a relay terminal block as short as possible. Then, tightly twist the relay terminal block cables and connect them to the DUT at an appropriate length (See L4 in Figure 1).
See Figure 1 for the example:

*1: The L4 cables should withstand the total current from the master and slave 1 & 2.

2. Advanced Connection Methods
If the output becomes unstable under the basic connection, the following methods are available. Use all or any of three methods as required.
1) Ground either the positive or negative terminal of output (See the green lines in Figure 2). If either of the DUT input is grounded, check if short circuit may occur due to the output grounding.
For the parallel operation, you also need to check that all paralleled DC power supplies have the same control common terminal. Keep in mind that the control common terminal differs by our DC power supply series as follows:

2) Add a large capacitor to the relay terminal block (See the red lines in Figure 2). If high speed power supply such as PBZ Series has been used, avoid this method.

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