JUMO 709040 TYA-110 thyristor power unit Operating Manual - Manual (Page 9)

Power units 02.06 9
1 Introduction
1.3 Description
Application A thyristor power unit can be used wherevere sizeable resistive or inductive
loads are switched frequently – for instance, in industrial furnaces and plastics
processing.
Operating
modes The thyristor power units can operate under phase-angle control with adjust-
able current limiting or in burst-firing mode, depending on the setting of the in-
ternal switch. An external switch may also be used to change over the operat-
ing mode. In burst-firing mode, the phase angle can be cut back for the first
half-cycle, for driving transformer loads.
Regulation Variations in the line supply voltage have no effect on the control-loop regula-
tion during operation. This is ensured by a subsidiary V
2
, P or I
2
control loop.
An input signal attentuator (trimmer) permits the restriction of the control
range, and a base load can be set by an external potentiometer. In burst-firing
mode an economy circuit can be used for multi-phase loads. With phase-an-
gle control, the target phase angle that is set by the controller is gradually ap-
proached from the initial 180°, thus avoiding high surge currents (soft start).
Versions The power stage is composed of 2 thyristors connected in anti-parallel, the in-
sulated heatsink, and the control electronics. Thyristor units for up to 50A rat-
ed load can either be snapped onto a 35mm DIN rail, or mounted on a bas-
plate fixed to a wall. Units for 75A or higher rated load can only be wall-
mounted.
Standards The thyristor power units meet VDE 0160 5.5.1.3 (5/88) and VDE 0106 Part 100
(3/83). Earthing must be carried out in accordance with the regulations of the
local electrical supply utility.
1.4 Type designation
The basic version, TYA-110/3, includes the following features:
- Voltage, current and potentiometer input
- Input signal is freely selectable
- Operating mode is freely selectable
- Phase-angle reduction of 1st half-wave for burst-firing operation
- Supply line voltage monitoring
- Input signal attentuation by trimmer
- Soft start in phase-angle operation
- V
2
-control with adjustable power level output signal
- Master-slave economy circcuit
- Firing-pulse inhibit