KEPCO MST Series - Manual (Page 33)

MST SERIES 061813
3-1
SECTION 3 - OPERATION
3.1 INTRODUCTION TO CONTROLLING THE MST POWER MODULE OUTPUT
The MST family of Power Modules is designed for remote operation only. Operating the power
supply requires a series of commands to be sent to the Power Module from a host computer, via
a selected IEEE 1118 bus compatible Controller (see PAR. 1.4.1). The commands may either be
pre-programmed or sent individually using a keyboard, depending upon the controller selected.
The MST Power Module responds to both SCPI (Standard Commands for Programmable
Instruments) and CIIL (Control Interface Intermediate Language) commands. SCPI and CIIL
provide a common language conforming to IEEE 488.2 for instruments. For an explanation of
SCPI and CIIL commands and program syntax, refer to the applicable controller Instruction
Manual.
3.1.1 STATUS FLAGS (ERROR MESSAGES)
The MST Power Module supplies information to the controller regarding its operating condition
when queried via the STAT:QUES:COND? command in SCPI, or via the STA command in CIIL.
A listing of the standard error messages for both SCPI and CIIL appear in the Instruction Manu-
als for the various Kepco Controllers (see PAR.1.4.1). Table 3-1 lists the “catastrophic” status
messages of both SCPI and CIIL, along with the related MST Power Module condition.
3.1.2 TIMING REQUIREMENTS FOR A VALID STATUS
After sending a command that might affect the output of the Power Modules or their relays, it is
recommended that the Status command be sent. For detailed information on this command
refer to the applicable controller Instruction Manual. For the Controller/MST system status com-
mand to be valid, the required time delay before sending the command is as follows:
• After an Open, Close (CIIL only), OUTP ON or OFF (SCPI only), Change of Polarity, or
Change of Mode, wait approximately 300 milliseconds.
TABLE 3-1. ERROR MESSAGES
CIIL ERROR MESSAGE SCPI STATUS MESSAGE POWER MODULE CONDITION
DEV Power Loss POWER LOSS OVERVOLTAGE / OVERCURRENT (See PAR. 3.7.2)
SOURCE POWER LOSS (See PAR. 3.7.4)
DEV Crowbarred None Not Supported
DEV Over Temperature OVERTEMPERATURE OVERTEMPERATURE (See PAR. 3.7.3)
DEV Overload OVERLOAD OPERATION IN MODE OTHER THAN PRO-
GRAMMED MODE (See PAR’s. 3.2.1, 3.2.2)
DEV Voltage Comparison Error VOLTAGE ERROR OUTPUT NOT AT PROGRAMMED VALUE
DEV Current Comparison Error CURRENT ERROR OUTPUT NOT AT PROGRAMMED VALUE
DEV Relay Not Opened
DEV Relay Not Closed
DEV Polarity Error RELAY ERROR DEFECT IN ISOLATION OR POLARITY RELAY
OPERATION
DEV Load Path Fault RELAY ERROR OPEN SENSE LEAD OR OPEN POWER LEAD
CONDITION (See PAR. 3.7.5)