GE 239 Instruction Manual page 78

4 PROGRAMMING
• PHASE A/B/C CURRENT: Enter the desired phase current for simulation. For example, to verify
operation of the unbalance function, turn the unbalance function trip on, set 6 3527(&7,21?3+$6(
&855(17?81%$/$1&(?3+$6( 81%$/$1&( 75,3 3,&.83 to  , and set 6 3527(&7,21?3+$6( &855(17?
81%$/$1&(?3+$6( 81%$/$1&( $/$50 to 2)) . Enter the following simulation values, assuming 6
6<67(0 6(783?02725 '$7$?02725 )8// /2$' is set to $ , to create an unbalance of 27%:
I = 100 A
a
I = 52 A
b
I
= 85 A
c
Now set 6 7(67,1*?&855(17 6,08/$7,21?6,08/$7,21 21 . The relay will see this simulated current
in all 3 phases instead of the actual input current. The 239 should trip after a time determined by
6 3527(&7,21?3+$6( &855(17?81%$/$1&(?3+$6( 81%$/$1&( '(/$< setpoint. Set 6 7(67,1*?&85
5(17 6,08/$7,21?6,08/$7,21 2)) after testing is complete.
GROUND CURRENT: Enter the ground current for simulation of a ground fault. Then set 6
•
7(67,1*?&855(17 6,08/$7,21?6,08/$7,21 21 to see the effect of this current.
4 • SIMULATION ENABLED FOR: Select the desired length of time that simulation will be enabled.
When the programmed time has elapsed, current simulation will turn off. If 81/,0,7(' is selected,
simulated current will be used until one of the above mentioned conditions is met.
d) ANALOG OUTPUT SIMULATION
• SIMULATION: Enter ON to switch from actual analog output to the programmed simulation
value. Set this setpoint to OFF after simulation is complete. As a safeguard, simulation will auto-
matically turn off if:
• power to the 239 is turned off and on
time programmed in the 6 7(67,1*?$1$/2* 287387 6,08/$7,21?6,08/$7,21 (1$%/('
•
)25 setpoint has elapsed since simulation was first enabled
When analog output simulation is turned on the following flash message will be displayed for 3 sec-
onds.
When analog output simulation is turned off the following flash message will be displayed for 3
seconds.
• ANALOG OUTPUT FORCED TO: Enter in percent the analog output value to be simulated.
Whether the output is 0-1mA, 0-20mA or 4-20mA is dependent upon the selection in 6 
6(783$1$/2* 287387$1$/2* 287387 5$1*( .
EXAMPLE:
Alter the setpoints below as shown:
6  6(783$1$/2* 287387$1$/2* 287387 5$1*(  0$
6 7(67,1*$1$/2* 287387 6,08/$7,21$1$/2* 287387 )25&(' 72 
6 7(67,1*$1$/2* 287387 6,08/$7,216,08/$7,21 21
4-40
Courtesy of NationalSwitchgear.com
SIMULATION
HAS BEEN ENABLED
ANALOG OUT SIMULATION
HAS BEEN DISABLED
239 Motor Protection Relay
4 PROGRAMMING
GE Multilin