Siemens SIMADYN D Manual page 466

Closed-loop thyristor current control
External faults
Acknowledging
fault messages
Undervoltage
Temperature
monitoring
Hardware faults
5-26
The user can disable the closed-loop thyristor current control with fault
message at inputs SOL.IF1, .IF2.
The system can be switched-in again after a fault has occurred after
• Removing the fault
• Acknowledging the fault
→ 1)
• Switch-on command
= 0 → 1)
All of the faults which are present are displayed at outputs SOL.YW1 and
YW2; however, they are not saved. Using these outputs, it can be
checked whether a fault has been removed.
The faults are only removed from fault words SOL.YF1, .YF2 after
acknowledgment and if they have been removed.
An undervoltage condition, detected by the SITOR set electronics can be
handled as configured at input SOL.UNM.
The selection results in different responses to this message:
• UNM=0:
Message: Undervoltage as alarm (SOL.YW1\bit 6)
• UNM=1:
Transition into the status: Pulse inhibit SW
• UNM=2:
Transition into the status: Pulse inhibit SW +
total pulse inhibit (HW-ITDC)
The "Temperature monitoring" signal is derived from the fan monitoring of
the SITOR set and must result in a trip in order to avoid destroying the
thyristors as a result of overtemperature.
When the fan runs-up, the SITOR electronics suppresses the monitoring
signal for approx. 10 s. This is the reason that the fan should be
powered-up together with the SITOR set electronics power supply.
The faults, detected by the ITDC hardware are enabled with the
SOL.HMH mask, and entered into alarm word SOL.YW1. These masked
bits are output in word SOL.YHW.
(signal edge at connection SOL.QUI = 0
(signal transition at connection SOL.ION
System- and communication configuring D7-SYS - SIMADYN D
Edition 06.2002