AMETEK ReFlex Fault Protection Groups - Manual (Page 4)

Technical Note
ReFlex Power™ Fault Protection Groups
Document No. M380595-TN Rev A • 01/08/09
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FAULT PROTECTION GROUP SCPI COMMANDS
The ReFlex Power
TM
MODF signal requires the following SCPI
command to setup or preprogram power modules to execute a
shutdown on individual faults or when the ENAble input is
deasserted. For additional details of ReFlex Power
TM
SCPI
programming commands please refer to the Programming
Manual, M380056-03.
SCPI Command Description
OUTP:MODFault bval Establish on module n, bval = On, that Trig Out is in MODule Fault
output mode, bval = Off, normal trigger mode (Power on default).
OUTP:MODFault? Query if Trig Out is configured for MODF operation on module n.
When a Fault occurs, if the cause of the fault is external to the
RFP system, the user will need to take corrective action to
remove the cause of the fault. Only the Module that caused
the fault will show a fault other than GroupFault if the fault was
triggered from a Series or Parallel Group. If the fault was
caused by a non-group module then its fault indicator will be
illuminated. For example, if the fault was caused by an OCP,
and the Current protection limit turned out to be too low, then
the OCP limit would need to be modified. To resume
operation of the fault group, issue the following command
sequence: *CLS to the module that caused the fault that
brought down the group; this will de-assert the MODF signal,
and then issue OUTP:STATE 1 commands to the
modules/Group Masters in the proper order to bring up the
voltages in proper sequence. A system Reset (*RST) will
clear all Fault Protection Groups restore all modules to power-
on default conditions. Fault Protection Groups must be
reprogrammed after a system rese
FAULT PROTECTION GROUP TIMING CHARACTERISTICS
The Module Fault Output signal is generated in VHDL to
ensure fast response to any reported fault condition with a
latency of 500 nanoseconds maximum from module-to-
module. The Oscillograph below shows two ReFlex Power
TM
modules MODF signals on Ch. 1 and 3, and output signals on
Ch. 2 and 4, respectively. A fault condition on one module
immediately de-asserts the ENAble input to the second
module, resulting in both modules shutting down.
Module 1 Fault
Module 2
Deasserted
Module 1 Output Shut Down
Module 2 Output Shut Down