KUKA Low-voltage power unit PSU PH1003-2840

The KUKA PH1003-2840 is the Low-Voltage Power Supply Unit (PSU) for the KRC2 Edition 2005 (Ed05) controller.1

While the KPS 600 (which you may have seen in the cabinet) handles the high-voltage DC bus for the robot motors, the PH1003-2840 (manufactured by MGV) is responsible for the stable 27V DC supply that powers the controller's logic boards, the PC, and the peripheral electronics.

Technical Specifications

This unit is a heavy-duty industrial switching power supply designed to handle the high-vibration environment of a robot cabinet.

Feature    Details

Manufacturer    MGV (Model: 15.8044.800)

KUKA Art.  No.    00-109-802 (also referenced as 00-109-032)

Input Voltage    3-phase AC (3 x 320V – 460V)

Output Voltage    27.3V DC (adjustable)

Output Current    40 Amps

Application    Logic power for KRC2 Ed05 / VKRC2 Ed05

Role in the Cabinet

The PH1003-2840 is essentially the "heartbeat" of the control system.  It powers:

The MFC/DSE cards (the "brains" you asked about earlier).

The KCP (Teach Pendant) display and controls.

The PC Chassis (Motherboard and Hard Drive).

The ESC (Electronic Safety Circuit) safety signals.

Common Troubleshooting

Because it provides the logic power, a failure here usually results in a "dead" controller or intermittent "reboot" loops.

No Display on KCP: If the KCP screen is black and there are no lights on the PC, check the input fuses for this power supply.

Overload (Red LED): If the output current exceeds 40A (due to a short circuit in the wiring or a bad gripper solenoid), the unit will shut down.

Voltage Drop: Over time, the capacitors can age.  If the output drops below ~24V, the PC might crash unexpectedly or the safety circuit (ESC) might trigger "Emergency Stop" errors without cause.  You can measure the voltage at the output terminals;  it should ideally be set to 27.1V – 27.3V.

The "Logic Power" Chain

In a typical KRC2 Ed05 setup, the components you've asked about work like this:

PH1003-2840: Provides 27V DC power to the whole system.2

DSE-IBS: Uses that power to run its processor and send commands.

KSD1-08: Receives commands from the DSE and pulls high-voltage power (from the KPS600) to move the motor.