Test Configuration; Test Output Relays & Leds - GE 239 Instruction Manual

CHAPTER 4: PROGRAMMING
4.8.1

Test Configuration

4.8.2 Test Output Relays & Leds
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
• DISABLE START PROTECTION: To verify correct operation of overload curves it may be
necessary to disable the start protection. When this feature is turned on and current is
injected above the full load setting, the overload curves will be used to build up the
thermal capacity instead of the
setpoints. When this feature is enabled the 239 assumes the motor is in RUN condition
any time current is present even on initial startup inrush current.
EXAMPLE:
S2: SYSTEM SETUP\MOTOR DATA\MOTOR FULL LOAD CURRENT: 100 A
S2: SYSTEM SETUP\MOTOR DATA\SAFE STALL TIME COLD: 20.0 S
S2: SYSTEM SETUP\MOTOR DATA\LOCKED ROTOR CURRENT: 6.0 X FLC
S2: PROTECTION\PHASE CURRENT\OVERLOAD\OVERLOAD CURVE NO: 4
S5: TESTING\TEST CONFIGURATION\DISABLE START PROTECTION: YES
Inject phase current that 5.0 × FLC. The OVERLOAD TRIP will occur in 14.57
seconds instead of 28.8 seconds. This is because the overload curves is being
used to buildup the thermal capacity instead if the
settings.
ROTOR CURRENT
As a safeguard, start protection will automatically be re-enabled if:
•power to the 239 is turned off and on
•time programmed in the
PROTECTION FOR:
disabled
When start protection is disabled the following flash message will be displayed for 3
seconds.
START PROTECTION
HAS BEEN DISABLED
When start protection is re-enabled the following flash message will be displayed for 3
seconds.
START PROTECTION
HAS BEEN ENABLED
• DISABLE PROTECTION FOR: Select the desired length of time that start protection will
be disabled. When the programmed time has elapsed, start protection will be re-
enabled. If is selected, start protection will be disabled until the feature is
UNLIMITED
turned off via the DISABLE START PROTECTION
control power is removed from the 239.
• DISABLE STATISTICS LOGGING: Setting this setpoint to NO disables the logging of the
MOTOR MAX STARTING CURRENT
Section 5.25.2.3 Motor Statistics on page 5–61 for further details.
• OPERATION TEST: To verify correct operation of output relay wiring, each output relay
and status indicator can be manually forced on or off via the keypad or serial port.
LOCKED ROTOR CURRENT
SAFE STALL TIME
S5: TESTING\TEST CONFIGURATION\DISABLE
setpoint has elapsed since the start protection was first
setpoint or via the serial port or until
and
MOTOR RUNNING TIME
and SAFE STALL TIME
and
LOCKED
actual values. See
4–51