Section 3 Basic Application Methods
3-6
3.2
Monitoring Motor Load Current
Advantages of Using the K3HB-X
• The motor load current can be monitored and the measurement
value and output status held when the motor is tripped. The
K3HB-X will hold this status even if a power interruption occurs.
• A 75:5 current transformer (CT) can be used for motor current
detection.
• Up to 10 A can be input directly using the K3HB-XAA.
• Current can be displayed in amperes (A) up to two digits past the
decimal point (@@.@@ A) on the K3HB-XAA.
• Two-level output detection can be used for the upper limit.
• The startup compensation timer on the K3HB-XAA can be set to
prohibit measurements for a certain amount of time after the
motor startup signal is received to prevent judgments that result in
inadvertent output due to inrush current measured when the
motor starts.
• The startup compensation timer is set to 10 s.
• An output is generated when the H and L values exceed the
comparative output settings. (Uses two-level detection for the
upper limit.)
K3HB-X
Power
supply
ON
signal
Magnetic
relay
0 to 50 A AC
0 to 5 A
Process Indicator
K3HB-XAA
Comparative output 1
(comparative output H)
Comparative output 2
(comparative output L)
Motor
Comparative output H
Startup compensation
timer input
Power supply side
Com
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