Manual 37941A DTSC-200A - ATS Controller - Operation
© Woodward Page 21/37
Blocking Transfer Operations
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There are four cases that are able blocking ATS’ transfer operations:
1. LogicsManager function ‘Inhibit ATS’ LM 98.01 (see below)
2. LogicsManager function ‘Inhibit XFR to S1’ LM 98.02
3. LogicsManager function ‘Inhibit XFR to S2’ LM 98.03
4. Mechanical Failure LM 21.11; monitored as Limit Switch Failure (see chapter Limit Switch Monitoring
(Mechanical Failure, LM 21.11) on page 23).
LogicsManager function "Inhibit ATS"
If the LogicsManager function "Inhibit ATS" (parameter 12600) is TRUE, all transfers are blocked! This means
that the LogicsManager flags
• 20.07 "Close to S1"
• 20.09 "Close to S2"
• 20.08 "Open from S1"
• 20.10 "Open from S2"
are not enabled anymore. This block all transfer operations!
Refer to the Configuration Manual 37940 for a description of these parameters.
Switch Failures
Depending on the configured "Transfer switch type" (parameter 3424), all transfers are blocked if specific switch
failures occur. Refer to the Configuration Manual 37940 for a description of this parameter.
Transfer Switch Type "Standard"
If one of the following failure conditions is present, all transfer operations are blocked and the respective failure
must be acknowledged before a new transfer is possible:
• Fail to close S1 is present
• Fail to close S2 is present
Transfer Switch Type "Delayed"
If one of the following failure conditions is present, all transfer operations are blocked and the respective fail-
ure(s) must be acknowledged before a new transfer is possible:
• Fail to open S1 is present
• Fail to open S2 is present
• The transfer switch is in NEUTRAL position AND
o Fail to close S1 is present AND
o Fail to close S2 is present
Transfer Switch Type "Closed"
If one of the following failure conditions is present, all transfer operations are blocked and the respective fail-
ure(s) must be acknowledged before a new transfer is possible:
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