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6. Mains load optimization
Mains load optimization offers considerable advantages, e.g. redu-
cing mains load peaks and system disturbances. Mains load optimi-
zation is possible under the following conditions:
• When more than one power controller is used
• Operating mode TAKT
The mains load is optimised by cascading the switching on of the
individual devices. There are two different processes for doing so.
6.1 Internal mains load optimization
(Operating modes QTM (Thyro-1A ) and TAKT)
In the operating modes QTM and TAKT the synchronization of 2-12
controllers is possible. The operating mode QTM works in a quick
half wave switch principle with a pattern of switched and blocked half
waves at a set time interval < 1 second, also known as T0. In order
where possible to create in mains a balance from the start (not after
T0) the individual controllers synchronize by offsetting themselves
by a network period. The first of the controllers connected has the
SYT input X2.7 bridged to +5V X2.8.
The following controllers get their signal to X2.7 from the sync. out-
put X2.6 of the previous controller. At the last controller X2.6 is free.
(Parallel series connection) (see figure 8, page 75).
6.2 Synchronization with Thyro – Power Manager
If power controllers are working in accordance with the full wave
switch principle (TAKT) then this can lead to an increased mains
load through an unfavourable spread of switching on and off times.
This, as a result, then has negative effects such as higher power loss,
flicker effects etc.
If load elements are used, whose resistances increases over time
(ageing), then potentially a transformer with increased power output
may even need to be implemented.
DANGER
Danger when making adjustments
Risk of injury / Risk of damage to the device or plant
> Observe all safety regulations in the safety chapter.
68
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