Α Start; Monitoring Of The Mains Voltage Drop; Firing Pulse Inhibit - JUMO 709061/8-01-032 Operating Manual

6 Special device functions
6.8 α start
Default setting

6.9 Monitoring of the mains voltage drop

Default setting

6.10 Firing pulse inhibit

Internal
External
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The phase-angle control of the first half-wave (α start) is not activated.
For transformer loads, the thyristor power controllers operate in continuous
burst-firing mode and in logic operation with phase control of the first half-
wave.
The factory setting is an angle of 70 °el. (electrical). This value can be adjusted
in the configuration level or operator level within the range of 0 to 90 °el.
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If the effective values of the analyzed half-waves are more than 10 % apart, an
alarm message is displayed and the digital output for the collective alarm
switches depending on the set control direction.Immediate firing pulse inhibit
prevents the connected transformer loads from destroying the semiconductor
fuse due to a DC component.If there are no further mains voltage drops, the
firing pulse inhibit is removed and the power controller continues operation
(e.g. with a soft start).
Monitoring is not activated.
v Chapter 5.1.5 "Monitoring"
The inhibit function serves to protect the thyristor power controller and the
connected devices.
The thyristor output is locked during:
- Device switch-on (during the startup procedure)
- Changes in the configuration level
- Insufficient or excessive voltage supply
- Setup of data transfer to the device
- Device temperature greater than 115 °C
- Short-term supply drops > 10 % within a half-wave
vChapter 6.9 "Monitoring of the mains voltage drop"
Via the "Inhibit" digital input
v Chapter 3.3 "Connection diagram"
Alternatively, the thyristor output can also be switched off via the PROFIBUS,
RS422/485 interfaces.
V1.04/EN/00561071 [Thyristor Power Switch TYA 201]]
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