26
Rockwell Automation Publication 440R-UM014D-EN-P - December 2019
Chapter 6
Status Indicators and Diagnostics
ERR Flashing Codes
Figure 15 - ERR Flashing Codes
Line Breakage
Line breakage can be detected at standstill or with the motor spinning.
With Motor at Standstill
With the motor at standstill, the outputs of the MSR55P safety relay are
energized. A break in the wires at L1, L2, and L3 is detected. The ERR
indicator flashes and the ERR semiconductor output turns ON.
• L3 - The ERR indicator flashes three times.
• L2 - The ERR indicator flashes two times.
• L1 - The ERR indicator flashes two times.
With Motor Spinning
• Electronic Drive
In the case where the motor is spinning under the command of an
electronic drive, the outputs are de-energized. Line breakage is not
detected by the MSR55P safety relay. This state is still considered a safe
situation because the outputs of the MSR55P safety relay are de-
energized. When the drive turns off, and the motor spins to a standstill;
the line breakage is detected and the following occurs:
– The outputs of the MSR55P safety relay remain de-energized.
– The ERR output turns ON.
– The ERR status indicator flashes the code that is associated with the
breakage.
t
2s
0s
4s
1) Undervoltage at VS
2) Wire-break/offset on L1 or L2
3) Wire-break/offset on L3
4) Failure in feedback circuit X1-X2
5) Simultaneity failure signal L2/L3
6) Potentiometer error Vm
7) Potentiometer error ts
Flashing codes of the ERR indicator in sequence of priority