JUMO 709050 IPC IGBT Power Converter IPC 70A Operating Manual - Manual (Page 20)

3 Installation
20 [IGBT Power Converter 70A] 02.08
3.4.1 Opening the housing
h Disconnect the built-in converter from the voltage supply on all poles
h Undo the bolt on the bottom left
h Push the housing cover upward and pull off to the front
V Caution!
The converter has 2 power supplies (to the control section and to the power
section). Disconnect both supplies (all poles) prior to starting work on the
converter.
Allow 1 minute to elapse after switching off prior to starting work on the
converter, since potentially fatal voltages could be present in the converter
interior and at the terminals.