PM281X: Switching between 110V and 220V

PM281X: Switching between 110V and 220V
Device	PM281X
Affects part(s)
Needs equipment	Screwdriver
Difficulty	◉◌◌◌ Easy
Type	General

Problem description

If you have bought a Philips/Fluke PM2811, PM2812, or PM2813 power supply from a country who's electric grid runs at a different voltage, you may want to modify your power supply, to match your electrical grid (instead of using a transformer).

Solution

Black wire, 110V position. (Figure 1)

Black wire, 220V position. (Figure 2)

Blue wire, 110V position. (Figure 3)

Blue wire, 220V position. (Figure 4)

These power supplies are internally configured to one of the following ranges:

• 94V .. 130V (a.k.a. nominally 110V)
• 190V .. 255V (a.k.a. nominally 220V)

To switch the voltage of the power supply between 110V/220V configurations you have to take the following actions:

• Move the black jumper wire on the "Input Module" PCB, to the correct jumper. (this is marked via silkscreen on the PCB)
  • (Note: the service manual forgets to mention this)
  • See Figure 1 and Figure 2
• The blue (bl) wire of the cable loom DB1 must be connected to
  • X4106 for 110V operation
  • X4102 for 220V operation
  • You can see the location of these pins on page 63 of the service manual
  • Also see Figure 3 and Figure 4 (note that the PCB from the factory has no text next to these pins, you can only identify them based on relative position)
• The fuses must be replaced. The required fuse current is different for each voltage configuration, and also depends on the number of modules the power supply is configured with
  • Note that number of modules is not the same as number of outputs. Some PM2812 have 2 power modules, while some have 3.
• Please write on the back of the unit the current supported voltage.

Fuses

Required fuse value

Fuses 2x:	1 Module PM2811	2 Modules PM2812/[0,1,2]	3 Modules PM2812/[3,4]; PM2813
110V	2.5AT	4AT	6.3AT
220V	1.25AT	2.5AT	3AT

"T" Typically means slow-blow fuse. Most of the time it's the first character in the code of a fuse, but here it appears to be used at the end of the code.

Note that the following fuses have been found in actual power supplies, it is unclear if they came with these from factory:

• On 3pcs of PM2812/4 originally configured for 110V operation 6.3A FERRAZ SU (medium time lag) fuses have been found
• On 1pcs of PM2811, originally configured for 110V operation F2.5 (Fast Speed) fuses have been found.
• On the bottom power module board there is a fuse, that is not documented in the service manual. The silk screen asks for T1.6A fuse (slow blow), but F1.6A fuses (fast blow) have been found in at least 2 places. (these fuses don't need to be adapted for 110V/220V operation, cause they see the same voltage/current independent of the supply voltage, so feel free to ignore this information)