Current Simulation - GE 239 Instruction Manual

4.8.3

Current Simulation

4–52
Courtesy of NationalSwitchgear.com
Testing is only allowed if there is no phase and ground current present and current
simulation is turned off.
If the test is attempted while current is present, the setpoint will be forced to NORMAL
MODE and the following flash message will be displayed for 3 seconds.
RELAY TEST BLOCKED
CURRENT PRESENT
If
S5: TESTING\ CURRENT SIMULATION\SIMULATION
to NORMAL MODE and the following flash message will be displayed for 3 seconds.
RELAY TEST BLOCKED
AMPS SIMULATION ON
If testing is attempted via the serial port while phase or ground current is present or
simulation mode is on, an error code will be returned.
While the
OPERATION TEST
key to scroll to the desired output relay and/or status indicator to be tested. As long as
the test message remains displayed the respective output relay and/or status
indicator will be forced to remain energized. As soon as a new message is selected,
the respective output relay and/or status indicator return to normal operation.
As a safeguard, relay and LED test will turn off automatically if:
•power to the 239 is turned off and on
•phase or ground current is detected by the 239
•current simulation is turned on
•new message is displayed
Simulated currents can be forced instead of the actual currents sensed by the external CTs
connected to the 239. This allows verification of all current related relay functions such as
timed overload trip. It also allows verification that external trip and alarm wiring is
responding correctly.
• SIMULATION: Enter the required simulation phase and ground currents in the
following messages. Enter ON to switch from actual currents to the programmed
simulated values. This command will be ignored if real phase or ground current is
present. Set this setpoint
will automatically turn off if:
•real phase or ground current is detected while in simulation mode
•power to the 239 is turned off and on
•time programmed in the
ENABLED FOR setpoint has elapsed since simulation was first enabled
•239 is tripped
is
ON
setpoint is displayed, use the
after simulation is complete. As a safeguard, simulation
OFF
S5: TESTING\CURRENT SIMULATION\SIMULATION
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
CHAPTER 4: PROGRAMMING
, the setpoint will be forced
or
VALUE VALUE