Zyxel Switch DC Power Installation Guide

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Precautions:

• Ensure the DC PSU is disconnected before installation.
• To reduce the risk of electric shock, properly ground the switch according to the User Guide (page 50 of XMG2230 series for example) before operation. If you cannot verify grounding, contact a certified electrician for assistance.
• High-voltage DC PSUs and exposed power wires are dangerous. To ensure equipment safety and regulatory compliance, DC power connections must be performed by a certified electrician.
• When connecting a DC PSU to the switch, ensure the positive and negative wires are correctly connected to the DC terminal block according to the DC connector on the rear panel.

1 Applicable Models and Power Budget

Model	DC input	Maximum DC power budget	Typical AC power budget
XMG2230-28HP	50-57 V	Up to 1440 W	Up to 700 W
XMG2230-52HP	50-57 V	Up to 2400 W	Up to 960 W

Note

If AC and DC power are connected at the same time, the system prioritizes AC input. For extended PoE budget, confirm that the switch is operating from DC input only.

2 AWG Wire Recommendation and PoE Budget Calculation

• Zyxel recommends using 16–28 AWG DC wires to ensure stable power delivery.
• The table below is a planning calculation based on 50 V DC and 10 A per 16 AWG positive/negative wire pair. It explains why additional wire pairs increase available DC-side power for PoE Budget.

Wire pairs	Calculation basis	PoE Budget (W)
1 pair of 16AWG	50V x 10A	500 W
2 pairs of 16AWG	50V x 20A	1000 W
3 pairs of 16AWG	50V x 30A	1500 W
4 pairs of 16AWG	50V x 40A	2000 W
5 pairs of 16AWG	50V x 50A	2500 W
6 pairs of 16AWG	50V x 60A	3000 W

Note

Use this table as a design estimate only. Actual usable power is limited by the PSU rating, switch DC input limit, switch PoE budget, cable length, voltage drop, temperature, terminal rating, overcurrent protection, and local electrical code.

3 DC Power Installation Workflow

Steps	Action	Acceptance criteria
Step 1	Verify PSU output	Check the back label or measure DC output toconfirm50-57VDCbeforeconnecting to the switch.
Step 2	Identify polarity and ground	Confirm or label +V, earth ground, and -V conductors clearly before insertion.
Step 3	Wire the terminal block	Before connecting six wire pairs to the DC terminal block, first verify the terminal orientation against the switch DC connector on rear panel to avoid reversing polarity. Strip and keep approximately 1 cm of insulation from the wire ends to minimize exposed copper when connecting to the DC terminal block.
Step 4	Attach the DC connector	Insert the terminal block into the switch DC input and lift the side levers.
Step 5	Power on and observe	Turn on the DC PSU and monitor switch boot and PSU status.

Step 3 Detail

The 14-pin DC terminal block and Switch DC connector have six positive conductors and six negative conductors.

Caution

1.Do not connect any wires to the center 2-pin of the DC terminal block.

2.For grounding purpose, connect the grounding cable to the grounding screw on the rear panel of the switch.

Step4 Detail

Before inserting the DC terminal block into the Switch DC connector, lift the levers on both sides.

4 Deployment Scenarios

The following examples show how one external DC PSU can supply either a single high-power switch or multiple switches.

Note

It is necessary to reserve 60W for system operation on each switch. Allocating all DC power to Powered Devices (PDs) may overload the power supply, trigger protection mode and causing a shutdown.

Application Environment

• Switches: one XMG2230-28HP and one XMG2230-52HP
• 54V DC PSU, with a maximum output of 2500W
• Six pairs of 16 AWG positive and negative wires
• 14-pin D-sub terminal block (from switch brown box)

Scenario 1: Single XMG2230-52HP high-power deployment

Allocating a DC power source to a XMG2230-52HP.

Device	AWG Wire-pair	Configured Total Power	System Reserve	Planning budget
XMG2230-52HP	6 pairs	2400W	60W	2460W
Remaining power				40W

Scenario 2: One 2500W DC PSU shared by two switches

A single DC PSU can be shared across multiple XMG2230 switches. The allocation below keeps the combined PoE setting below the PSU rating after reserving system power for both switches.

Device	AWG Wire-pair	Configured Total Power	System reserve	Planning budget
XMG2230-52HP	4 pairs	1460 W	60W	1520W
XMG2230-28HP	2 pairs	900W	60W	960W
Total	6 pairs	2360W	120W	2480W
Remaining power				20 W

5 Web GUI Configuration

After the switch boots from the DC input, configure Total Power(W) via PORT > PoE Setup > PoE Setup. Click Apply and save the configuration. Then verify the value in PoE Status.

6 Recommended External DC PSU Models

Delta: PMS 2,500 W series / PMS-□V2K5W1BTD

Meanwell: UHP-1500 series

Meanwell: UHP-2500 Series