Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 89
4.2.4 Summary Fault Signal
The Summary Fault signals, SUMMARY FAULT (Pin-6) and SUMMARY FAULT RETURN (Pin-7) signals
provides an indication of abnormal condition occurrence. A summary fault signal with a high state (applied
Vcc) indicates that there is no fault present, and a Low state (0V / short) indicates that fault is present,
refer to Figure 4-8.
NOTE: The user must make sure that the resistor should be designed in such a way that the current to the
summary fault pin should not exceed 0.1A.
In the default configuration, the signal reports the summary bit that is the logic-OR of the Questionable
Status Register outputs for the following events:
a) HV BUS OV fault: Overvoltage in HVDC BUS
b) Amplifier fault: Inverter Overcurrent Fault
c) Overtemperature fault: Inverter Over temperature
d) Output overvoltage fault
e) Output voltage regulation fault
f) Output current-limit fault.
The functionality of the Summary Fault signal could be programmed through SCPI commands to report
events as captured in either of the following sources: Questionable Status Register (default setting),
Operation Status Register, Standard Event Status Register, or Request Service Summary Bit. Also, the
Summary Fault signal operation could be enabled and disabled through SCPI commands. Refer to the
Sequoia Programming Manual, P/N M447353-01, and Tahoe Series Programming Manual P/N M447354-
01for specific information on the programming options.
Figure 4-8: Summary Fault Pinout Diagram
4.2.5 Output On/Off Status
External I/O Control Signal 15-pin connector is provided with Output ON/OFF Status; refer to Table 4-1 for
pin-out details. An output signal with a high state (2 to 5 VDC) indicates that the output of the power supply
is enabled, and a Low state (0V) indicates that the output of the power supply is disabled. The Output
status signal can be monitored between Pin-11 (OUTPUT STATUS) and Pin-1 (ISO_COM/ Return); refer
to Figure 4-9 for the pin-out diagram.
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