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6.9.1 Free-running economy circuit (asynchronous switching) for resistive
loads
6.9.2 Master-slave economy circuit (synchronous switching) for resistive and
transformer loads
H
Power units 05.01
A free-running economy circuit has the advantage that the average loading of
the supply network is reduced. Both power units operate independently and
regulate the required 3-phase power quite precisely. Even a possible part-load
failure will not necessarily have an effect on the temperature stability of the
control loop.
A subsidiary P control loop is required for both power units.
Switch
S3
Economy circuit
(free-running)
I resistive load
(master-slave)
I resistive load
- master function
- slave function
I transformer load
- master function
- slave function
If S12 and S13 are closed, it is not possible to change over to phase-angle control.
v Section 2.3 "Burst-firing operation for transformer loads and loads with a
high positive temperature coefficient TC (mixed operation)"
In the standard version, the master-slave economy circuit operates with a V
control. With extra code TO/TR it is also possible to use a P control and part-
load regulation. The control electronics of the master unit takes on the actual
power control function, and drives the slave unit in synchronization. This
makes it possible to drive transformer loads.
The combination of the fixed cycle time of the V
configuration makes it possible to achieve good voltage regulation for the indi-
vidual load resistances, even in the event of a part-load failure.
v Section 4.7 "Master-slave economy circuit, with resistive/inductive loads"
The jumpers on pin header X503 of the slave unit must be turned
through 90° !
v Section 6.2 "Adjustment switches S1 — 21 and pin headers X503
/ X504"
S4
S5
S6
S10 S11 S12 S13 S14 S17 S18 S20 S21
0
0
1
0
1
0
1
0
1
0
0
0
0
6 Settings
0
0
0
1
1
0
1
1
0
0
2
1
1
1
1
1
1
1
1
0
2
2
control and the delta load
1
2
1
1
2
1
1
2
1
2
2
1
2
49
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