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6.7 Load current adaptation (only with extra code TR/T0)
A
6.8 Select operating modes and load types
Power units 05.01
2
With P or I
control, switch S15 must be in position 0 if the operating current is
less than half the rated current. This is to ensure proper measurement of the
load current for the subsidiary control loop, the current limiting, and the over-
current / low current detection.
The factory setting must not be altered on the 150A and 250A
versions!
(Reserved for service purposes: 1A test mode)
Load current adaptation
I
< 0.5 x I
L
ThyN
L
> 0.5 x I
L
ThyN
k
factory setting
The internal switches S3, S10 — S13 and S20 are used to set the required
mode of operation.
In both phase-angle and burst-firing modes the thyristor power unit basically
operates with a subsidiary V
be changed over from V
v Section 6.5 "Subsidiary control loops"
Switch
Operating mode:
Phase-angle control
I for resistive or
transformer load
Burst-firing operation
I resistive load
I transformer load
- R ≈ constant
R
w
-
> 1
-- -- - -
R
K
- fixed cycle (500ms)
- variable cycle
Internal switch S 15
2
control loop. With extra code T0 or TR this can
2
2
to P or I
control.
S3
S10 S11 S12 S13 S14 S17 S18 S19
1
1
0
0
0
1
0
0
0
1
1
0
1
6 Settings
0
1
0
1
1
1
1
1
1
1
1
1
1
0
1
2
2
1
47
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