- General Electric Computer Accessories User Manual

GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions •
••
• 3-55
Hardware Fault Strings
Each Innovation Series product provides a hardwired, fail-safe 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 specifies 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 specifies the Hardware Fault Strings configuration parameters.
Parameter Description
Inh sim Loc/Sys flt
Disables the hardware fault string validation in simulation
mode only.
Faults and alarms
The following table specifies the faults and alarms associated 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 hardware fault string circuits 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 product operation.
The local fault string circuit is closed when the following 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 string circuit is closed when the following 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 hardware. If one of the
strings opens during product operation, then the hardware implements a
controlled shutdown of the power bridge and dropout of the contactors.
• The state of the hardware fault string inputs are reported to the control and
contained in variables Local fault string and System fault string. The variables
contain the actual state of the hardware circuits whether or not the product is
running. The trip faults associated with the fault strings, Local flt and System flt,
are reported when the fault string opens only when the product is running or
commanded to run.