JUMO 709062 TYA 202 - Three-Phase Power Controller Operating Manual - Manual (Page 85)

2012-12-31/00561073 [SCR power switch TYA202] 83
6 Special device functions
6.9 Monitoring of the supply voltage drop
If the effective values of the analyzed half-waves are more than 10 % apart, an
alarm message is displayed and the binary output for the collective alarm
switches depending on the set control direction.
Immediate firing-pulse inhibit prevents the connected transformer loads from
destroying the semi-conductor fuses due to a DC component.
If there are no further supply voltage drops, the firing-pulse inhibit is removed
and the power controller continues operation (e.g. with a soft start).
Factory setting Monitoring is not activated.
v Chapter 5.1.5 "Monitoring"
6.10 Firing-pulse inhibit
The inhibit function serves to protect the SCR power controller and the con-
nected devices.
Internal The SCR output is locked during:
- Device switch-on (during the startup procedure)
- Reset or restart as a result of changes in the configuration level
- Insufficient or excessive supply voltage
- Master/slave data line interruption
- Master/slave synchronization failure
- Setup of data transfer to the device
- Device temperature greater than 115 °C
- Rotary electrical field error
- Short-term supply drops > 10 % within a half-wave
v Chapter 6.9 "Monitoring of the supply voltage drop"
External Via the "Inhibit" binary input
v Chapter 3.3 "Connection diagram"
Alternatively, the SCR output can also be switched off via the PROFIBUS,
RS422/485 interfaces.