Analog Output Simulation - GE 239 Instruction Manual

CHAPTER 4: PROGRAMMING
4.8.4

Analog Output Simulation

239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
When current simulation is turned on the following flash message will be displayed for
3 seconds.
SIMULATION
HAS BEEN ENABLED
When current simulation is turned off the following flash message will be displayed for
3 seconds.
CURRENT SIMULATION
HAS BEEN DISABLED
• 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
S4: PROTECTION\PHASE CURRENT\UNBALANCE\PHASE UNBALANCE TRIP PICKUP
20% , and set S4: PROTECTION\PHASE CURRENT\ UNBALANCE\PHASE UNBALANCE
to . Enter the following simulation values, assuming
ALARM OFF
SETUP\MOTOR DATA\MOTOR FULL LOAD
27%:
I = 100 A
a
I = 52 A
b
I = 85 A
c
Now set
S5: TESTING\CURRENT SIMULATION\SIMULATION: ON
simulated current in all 3 phases instead of the actual input current. The 239 should
trip after a time determined by
CURRENT\UNBALANCE\PHASE UNBALANCE DELAY:
TESTING\CURRENT SIMULATION\SIMULATION: OFF
• GROUND CURRENT: Enter the ground current for simulation of a ground fault. Then
set
S5: TESTING\CURRENT SIMULATION\SIMULATION: ON
current.
• 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
is selected, simulated current will be used until one of the above
UNLIMITED
mentioned conditions is met.
• 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 automatically turn off if:
•power to the 239 is turned off and on
•time programmed in the
SIMULATION\SIMULATION ENABLED FOR
simulation was first enabled
is set to , to create an unbalance of
100A
S4: PROTECTION\PHASE
setpoint. Set
after testing is complete.
to see the effect of this
S5: TESTING\ANALOG OUTPUT
setpoint has elapsed since
to
S2: SYSTEM
. The relay will see this
S5:
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