Setpoint Access - GE 239 Instruction Manual

CHAPTER 3: OPERATION
]]
]]
PAGE HEADER
MESSAGE
3.1.5

Setpoint Access

239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
pressed the next choice is displayed. When numeric values are displayed, each time
is pressed, the value increases by the step increment, up to the maximum.
VALUE
Hold the key down to rapidly change the value.
• KEYPAD ENTRY: Press the
displayed. Press the
SETPOINT
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.
]
]
SUBGROUP HEADER
MESSAGE
The messages are organized into logical subgroups within each Setpoints and Actual
Values page as shown above.
Press the MESSAGE / MESSAGE
messages within that subgroup. Otherwise select the
display the next subgroup.
• COMPUTER ENTRY: When using a computer running 239PC software, setpoint values
are grouped together on a screen. The data is organized in a system of menus. See
Chapter 6.1: EnerVista 239 Setup Interface for further details.
• SCADA ENTRY: Details of the complete communication protocol for reading and
writing setpoints are given in 239 Communications Guide. A SCADA system connected
to the RS485 terminals can be customer programmed to make use of any of the
communication commands for remote setpoint programming, monitoring and
control.
Hardware security is designed into the relay to provide protection against unauthorized
setpoint changes. To program new setpoints using the front panel keys a hardware
jumper must be installed across the setpoint access terminals on the back of the relay.
These terminals can be permanently wired to a panel mounted keyswitch if this is more
convenient. Attempts to enter a new setpoint without the electrical connection across the
setpoint access terminals will result in an 'ILLEGAL ACCESS' error message. When setpoint
programming is via a computer connected to the rear RS485 communication port, no
setpoint access jumper is required. If a SCADA system is used for relay programming, it is
up to the programmer to design in appropriate passcode security.
key once and the first page of setpoints is
SETPOINT
key several times to move to the top of successive
|
|
SUB-SUBGROUP
HEADER MESSAGE
key when displaying a subgroup to access
MESSAGE
MESSAGE WITHIN SUB-
SUBGROUP OR SUBGROUP
/ keys to
MESSAGE
3–7