52 Operation TB9300 Installation and Operation Manual
© Tait International Limited April 2024
3.2.3 PMU
The only controls on the HW version 1 and 2 PMUs are the on/off switches
on the rear panel for the AC and DC modules, and the indicator LEDs
visible through a slot in its front panel. The H/W version 4 PMU has, in
addition, jumper settings for user selectable voltage (see Figure 3.6 on
page 53).
Warning The AC and DC module on/off switches do not totally
isolate the internal circuitry of the PMU from the AC or DC power
supplies. You must disconnect the AC and DC supplies from the
PMU before dismantling or carrying out any maintenance.
AC Module On/Off
Switch
This switch turns the AC input to the PMU on and off. Note that this switch
breaks only the phase circuit, not the neutral.
Note that in H/W version 1 and 2 PMUs, the The AC On/Off switch is
a button that protrudes whether on or off.
DC Module On/Off
Switch
This switch turns the DC output from the PMU on and off. Note that this
switch does not disconnect power from the DC converter itself. It disables
the converter by switching off its control circuitry. Even when the DC
converter is off, the DC input is still connected to its power circuitry.
The switch is recessed to prevent the DC module being accidentally
switched off.
Figure 3.5 Operating controls on the PMU H/W versions 1 and 2
b
AC module on/off switch
d
Indicator LEDs
c
DC module on/off switch
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