V1.04/EN/00561071 [Thyristor Power Switch TYA 201]
89
6 Special device functions
Silicon carbide heating elements have a nominal resistance that can increase
by a factor of 4 over the long term. So when dimensioning a system it is nec-
essary to adapt the power controller to produce twice the power for the heat-
ing elements. This doubles the current for the thyristor power controller.
Old = old state of the heating element R
New
=
New = new condition of the heating element
The relationship is illustrated by the following formula:
P control is also used for free-running economy circuits running off a 3-phase
supply network.
Which
operating mode
is suitable for
which load?
R
Alt
4
---------
P
Neu
U
Neu
I
Neu
•
U
Alt
2
---------
2I
Alt
•
U
Alt
I
Alt
•
P
Alt
=
=
=
=
(12)
Operating mode
Resistive load
Inductive
load
TC constant
TC positive
TC nega-
tive
Long-
term ag-
ing
Phase-angle control
X
X
Phase angle control
with
current limiting
X
X
X
Burst-firing operation
X
Burst-firing operation
with
α
start
X
X
Burst-firing operation
and current limiting
X
X
X
Subordinate control
loop
U
2
X
X
X
I
2
X
X
P
X
X
Содержание 709061/8-01-020
Страница 16: ...1 Introduction 14 V1 04 EN 00561071 Thyristor Power Switch TYA 201 ...
Страница 22: ...2 Mounting 20 V1 04 EN 00561071 Thyristor Power Switch TYA 201 TYA201 100A TYA201 150 200A ...
Страница 23: ...V1 04 EN 00561071 Thyristor Power Switch TYA 201 21 2 Mounting TYA201 250A ...
Страница 46: ...3 Electrical connection 44 V1 04 EN 00561071 Thyristor Power Switch TYA 201 ...
Страница 56: ...4 Operation 54 V1 04 EN 00561071 Thyristor Power Switch TYA 201 ...
Страница 78: ...5 Configuration 76 V1 04 EN 00561071 Thyristor Power Switch TYA 201 ...
Страница 96: ...6 Special device functions 94 V1 04 EN 00561071 Thyristor Power Switch TYA 201 ...
Страница 112: ...8 Error messages and alarms 110 V1 04 EN 00561071 Thyristor Power Switch TYA 201 ...
Страница 120: ...10 Technical data 118 V1 04 EN 00561071 Thyristor Power Switch TYA 201 ...
Страница 124: ...11 Certificates 122 V1 04 EN 00561071 Thyristor Power Switch TYA 201 ...