Abstract: The present invention provides a monitoring system (30) for monitoring operation of dynamic plant apparatus (10, 100). Electronic processing means (31, 32, 33) is provided for processing the electrical parameter signals provided by sensors (11-15) and is capable of thereby producing a plurality of different fault signals. Display means (34) is provided for displaying fault information to a user of the monitoring system (30), the display means (34) being controlled by the fault signals produced by the electronic processing means (31, 32, 33). The electronic processing means (31, 32, 33) compares the values of at least some of the measured parameter signals with limit values stored in memory by the electronic processing means (31, 32, 33) and when the comparison shows that the value of a measured parameter signal is outside the respective limit value the electronic processing means (31, 32, 33) produces a respective basic fault token signal.