3.2.5
Backspin Probes
ESP motors do not immediately come to a stop when power is removed. Instead the column of
fluid from the top of the pump to the surface falls back down the tubing causing the pump to spin
backwards. Starting the ESP motor during this “backspin” can cause damage to the pump or
motor. Backspin Probes provide Apollo the ability to detect when backspin is occurring. Apollo
can then be programmed to wait until the backspin has ended before starting the ESP motor.
A motor in backspin generates a voltage back up the motor lead cables to the transformer.
Backspin Probes measure this motor voltage at the output of the step-up transformer. The
probes are connected to the Apollo EIO board via three AC inputs and are installed inside an
external enclosure mounted to the VSD as shown in Figure 19: Backspin Probes-Drawing
1, page 45. Part Number 197543 consists of the external enclosure and the backspin probe
assembly. Currently, backspin input is not supported by RSTi.
Figure 19: Backspin Probes-Drawing 1
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