5
6.1.2.4. Checking the set safe stall time for
a single start................................133
6.1.2.5. Restart disable level, 49 RESTDIS ..133
6.1.2.6. Prior alarm level, 49 ALARM .......... 133
6.1.2.7. Time constant dial, Kc ...................134
6.1.3. Start-up supervision ....................................134
6.1.3.1. Start-up supervision based on
thermal stress calculation...............134
6.1.3.2. Checking the need for speed switch..134
6.1.4. Cumulative start-up time counter ................... 135
6.1.5. Short-circuit protection ................................. 135
6.1.6. Unbalance and phase reversal protection .......136
6.1.6.1. Selecting the pickup value for
element 46 ..................................136
6.1.6.2. Selecting the time constant, 46
TDIAL.........................................136
6.1.6.3. Connection with two phase current
transformers ................................136
6.1.7. Ground-fault protection ................................ 137
6.1.7.1. Stabilizing virtual ground-fault
currents ......................................138
6.1.7.2. Increasing the sensitivity of the
ground-fault protection...................138
6.1.8. Circuit-breaker failure protection .................... 138
6.1.9. Temperature protection (optional)................... 138
6.2. Protecting a circuit-breaker controlled motor ................ 138
6.3. Protecting a motor at an ambient temperature other
than 40°C..............................................................140
6.4. Protecting a contactor controlled motor.......................141
6.5. Protecting non-rotating objects ..................................142
6.6. Ground-fault protection in an isolated or a
compensated network..............................................142
6.7. Ground-fault protection in a solidly grounded network ...143
7. Ordering information ............................................. 145
8. Check lists ........................................................... 147
9. Abbreviations ....................................................... 155
Motor Protection Relay
Technical Reference Manual - ANSI Version
REM 610REM 610
1MRS755537
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