MMP SA-2550A
Page 8 of 24
Midwest Motion Products
DESIGN, MANUFACTURING & DISTRIBUTION - MOTION CONTROL EQUIPMENT
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Importance of Proper Current Monitoring
There are many factors which affect motor performance and longevity. One very important factor to motor life is motor current. An
input current that is too high can cause severe, irreversible damage to a motor. One common misconception with servo amplifiers is
that the input current into the amplifier and output current to the motor phases are the same amplitude:
𝐈
𝐈𝐍
≠ 𝐈
𝐌𝐎𝐓𝐎𝐑
(𝒏𝒆𝒄𝒆𝒔𝒔𝒂𝒓𝒊𝒍𝒚)
Due to the nature of the MMP SA-2550A the input and output currents usually correlate but are not always equal. To ensure the
motor is receiving the proper amount of current we highly recommend utilizing the current monitor pin (P1-8, see page 5, Pin
Functions table for further details) and measuring the voltage relative to signal ground as shown below.
The voltage output is analog and linearly scaled to the current input to the motor phases. The scale is 8.05 A/V by default as stated
in the Pin Functions table on page 5.
The current monitor signal tracks current delivered to all three motors phases (where applicable).
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