BECKWITH ELECTRIC M-3425, Instruction Book

Page: 39 / 225

M-3425 Instruction Book
2–2
60FL V.T. FUSE LOSS
disable ENABLE
60FL BLOCK INPUT
fl i6 i5 i4 i3 i2 I1
60FL RELAY OUTPUT
o8 o7 o6 o5 o4 o3 o2 O1
Status input IN1 is preassigned to be the 52b
breaker status contact. If a multiple breaker scheme
is used, the input IN1 must be the series
combination of the “52b” breaker contacts. Additional
user-chosen status inputs may initiate actions such
as breaker failure, initiate external fuse loss
detection, or trigger the oscillograph recorder.
(“•” denotes standard protective functions and “+”
denotes optional protective functions.)
• 21 Phase Distance, #1, #2
• 24 Volts/Hz: Def Time #1, #2, Inv Time
• 27 RMS Undervoltage, 3-Phase #1, #2
• 27TN Third-Harmonic Undervoltage,
Neutral, #1, #2
• 32 Directional Power, 3-Phase #1, #2
• 40 Loss of Field #1, #2
• 46 Negative Sequence Overcurrent:
Def Time, Inv Time
• 50 Instantaneous Phase Overcurrent
• 50BF Breaker Failure
• 50DT Definite Time Overcurrent, #1, #2
• 50N Instantaneous Neutral Overcurrent
• 50/27 Inadvertent Energization
• 51N Inverse Time Neutral Overcurrent
+ 51T Inverse Time Positive Sequence
Overcurrent for Stator Thermal Protection
• 51V Inverse Time Phase Overcurrent with
Voltage Control/ Restraint
• 59 RMS Overvoltage, 3-Phase #1, #2
• 59N RMS Overvoltage, Neutral #1, #2
• 60FL Fuse Loss Detection
+ 64B Brush Lift-Off Detection
+ 64F Field Ground Protection, #1, #2
• 78 Out-of-Step
• 81 Frequency #1, #2, #3, #4
• 81R Rate of Change of Frequency, #1,#2
• 87 Phase Differential
• 87GD Ground Differential
• External #1, #2
The relay allows the user to designate up to two
external functions which perform similarly to internal
relay functions. These external functions may be
enabled or disabled, and output contacts and
blocking inputs are chosen the same as for the
internal functions. The external functions are
described in further detail in Section 2.3, Setpoint
and Time Settings, External Functions subsection.
This designation is required for each relay function. After enabling
the function, the user is presented with the two following screens:
This assigns the blocking designations (up to six) for the enabled
function. “OR” logic is used if more than one input is selected.
This screen assigns the output contacts (up to eight) for the particular
relay function. If no output contacts are assigned, the function will
not generate any output or targets even though the function is
enabled.
■
NOTE: Uppercase text indicates selection.