JUMO 709050 IPC IGBT Power Converter IPC 70A Operating Manual - Manual (Page 10)

2 Introduction
10 [IGBT Power Converter 70A] 02.08
2.4 Brief description
Instrument The
J IPC is a IGBT power converter for controlling heater loads that
previously required a transformer (either a variable transformer or a
combination of transformer and thyristor power unit).
Its function is that of an electronic transformer with a pulsed DC output.
Advantages It combines the advantages of a conventional variable transformer, such as
amplitude control which is the sinusoidal current loading, with the advantages
of a thyristor power switch, such as current limiting, load monitoring,
subordinate control action, etc.
Application This power converter is employed wherever large resistive loads need to be
switched and no electrical isolation is required between the supply voltage
and the load voltage. Thanks to the amplitude control (the current drawn from
the supply is always sinusoidal), synchronous clock controls (as for burst-firing
operation) and power-factor compensation networks (for the reactive power
resulting from phase-control) are no longer required.
2.5 Interpretation of the LEDs
A
There is no electrical isolation between the voltage supply and the
load voltage.
overheat
This LED lights up if the maximum permitted temperature is
exceeded. The instrument remains disconnected until the
temperature has fallen below the limit value again.
The load fail LED is lit at the same time.
current limit
This LED lights up if the converter is working at the current
limit.
v Chapter 5.11 „Setting the current limit (max. current
adjust)“
load fail
This LED lights up if a total or partial load failure has been
detected.
v Chapter 5.12 „Total and partial load failure monitoring
(load fail adjust)“
This LED lights up if the fault signal relay has dropped out
Causes:
- Overheat
- Safety cut-out in the load circuit (semiconductor
failure, semiconductor short)
Power
This LED indicates that the control section is connected to the voltage supply.
It does not indicate the status of the power section!