GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions
•
••
•
3-55
Hardware Fault Strings
Each Innova tion Series prod uct provides a hard wired, fail-sa fe circuit to turn off
bridge power and to shut down its control. The circuit consists of two independent
isolated inputs designated the local and system fault strings. The loss of either input
results in the shutdown of the power bridge and control.
Diagnostic variables
The following table sp ecifies the Hardware Fault Strings diagnostic variables.
Variable Description
Local fault string State of the local fault string circuit.
System fault string State of the system fault string circuit.
Function configuration
The following table sp ecifies the Hardware Fault Strings configuration parameters.
Parameter Description
Inh sim Loc/Sys flt Disables th e hardware fault string validat ion in simulatio n
mode only.
Faults and alarms
The following table sp ecifies the faults and alarms associ ated with the Hardware
Fault Strings.
Fault/Alarm Description
Local flt Trip fault that occurs when the local fault string circuit is open.
System flt Trip fault that occurs when the system fault string circuit is open.
Function description
The hardwar e fault string cir cuits are capable of operating with either 24 volts DC or
115 volts AC. The inputs are isolated so the system and local fault string circuits are
not required to operate at the same voltage level. Both circuits must be closed for
normal produ ct operation.
The local fault string circuit is closed when the followin g connections are made
through appropriate circuitry:
• Terminal board (ATBA): Connector L115 or L24 to connector LCOM.
• Backplane: Jumper J2 pin 1 to pin 2.
The system fault strin g circuit is closed when the followin g connection is made
through appropriate circuitry:
• Terminal board (ATBA): Connector S115 or S24 to connector SCOM.
• The local and system fault strings are evaluated by the hardwa re. If one of the
strings opens during pr oduct operation, then the har dware implements a
controll ed shutdown of the power bridge and drop out of the contac tors.
• The state of the hardwar e fault string inputs are reported to the control and
contained in variables Local fault string and System fault string. The variabl es
contain the actual sta te of the hardware circuits wheth er or not the product is
running. The trip fault s associated with the fault strin gs, Local flt and Syste m flt,
are reported when the fau lt string opens only when the product is running or
commanded to run.