GE Power Quality Meter Series, Инструкция по эксплуатации

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GE Power Management PQM Power Quality Meter 3-7
3 OPERATION 3.3 KEYPAD
3
3.3.8 DATA ENTRY METHODS
a) KEYPAD ENTRY
Press the key once and the first page of setpoints is displayed. Press several times to
move to the top of successive pages. A header message with two bars in the first two character positions is the
start of a new page. The page number and page title appear on the second line. All setpoint page headers are
numbered with an ‘S’ prefix. Actual value page headers are numbered with an ‘A’ prefix.
The messages are organized into logical subgroups within each Setpoints and Actual Values page as shown
below.
Press the / key when displaying a subgroup to access messages within that subgroup.
Otherwise select the and keys to display the next subgroup.
b) COMPUTER ENTRY
When running PQMPC, setpoint values are grouped together on a screen. The data is organized in a system
of menus. See Chapter 6: SOFTWARE for further details.
c) SCADA ENTRY
Details of the complete communication protocol for reading and writing setpoints are given in Chapter 7: MOD-
BUS COMMUNICATIONS. A SCADA system connected to the RS485 terminals can be custom programmed
to make use of any of the communication commands for remote setpoint programming, monitoring, and con-
trol.
3.3.9 SETPOINT ACCESS SECURITY
The PQM incorporates software security to provide protection against unauthorized setpoint changes. A
numeric access code must be entered to program new setpoints using the front panel keys. To enable the set-
point access security feature, the user must enter a value in the range of 1 to 999. The factory default access
code is 1. If the switch option is installed in the PQM, a hardware jumper access can be assigned to a switch
input. Setpoint access can then only be enabled if the switch input is shorted and the correct software access
code entered. Attempts to enter a new setpoint without the electrical connection across the setpoint access ter-
minals or without the correct access code will result in an error message. When setpoint programming is via a
computer, no setpoint access jumper is required. If a SCADA system is used for PQM programming, it is up to
the programmer to design in appropriate passcode security.
SETPOINT SETPOINT
MESSAGE MESSAGE
MESSAGE
M E S S A G E
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P A G E H E A D E R
M E S S A G E S U B G R O U P H E A D E R
M E S S A G E M E S S A G E W I T H I N
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