Emerson 400518-01 Encoder Hardware, Motor Overtemp, Overspeed, RMS Shunt, Following Error

Safety Information Product Overview

Installation

Diagnostics

Options and Accessories

Specification

Encoder Hardware

If any pair of complementary encoder lines (A, B, Z) are in the same state, an encoder line fault is generated. Also, can be generated if all three commutation channels (U, V, W) are 0 or 1, an illegal state. The most likely cause is a missing or bad encoder connection.

Motor Overtemp

This fault is generated when the motor thermal switch is open due to motor over-temperature or incorrect wiring.

Overspeed

This fault occurs in one of two circumstances:

1.When the actual motor speed exceeds the Overspeed Velocity Limit parameter or 150% of motor maximum operating speed. This parameter can be accessed with PowerTools Pro software.

2.If the combination of command pulse frequency and Pulse Ratio can generate a motor command speed in excess of the fixed limit of 13000 RPM, an Overspeed Fault will be activated. In Pulse mode operation and any Summation mode which uses Pulse mode, the input pulse command frequency is monitored and this calculation is made. For example, with a Pulse Ratio of 10 pulses per motor revolution, the first pulse received will cause an Overspeed fault even before there is any motor motion.

RMS Shunt

This fault is generated when filtered average shunt power dissipation is greater than the design rating of the shunt resistor.

Following Error

This fault is generated when the following error exceeds the following error limit (default following error limit for an EP-I and EP-B is 0.2 revs). With PowerTools Pro you can change the Following Error Limit value or disable it in the Position view. In an EP-B and EP-I the Following Error Limit is functional in Pulse mode only.

Travel Limit +/-

This fault is caused when either the + or - Travel Limit input function is active.

Sync Fault

This fault occurs when the user selected trajectory update rate is set too shortbased on the processor requirements. The three possible trajectory update rates are 800µs, 1200 µs, or 1600 µs. Try changing the trajectory update rate to the largest value (1600 µs) and run the application again. If the problem persists after setting to 1600 µs, contact Control Techniques technical support. For more information on the trajectory update rate see the Epsilon EP-P

Drive and FM-3/4 Modules Reference Manual (P/N 400518-04).

Run Time Faults (EP-P only)

The "4" fault is caused by any of the following internal routine faults:

Trajectory Fault #1

This fault occurs when the drive commands motion that cannot be achieved due to excessive following error, accel, decel, velocity settings, or unuseable user units. Check the user units, velocities, accels and decels for correct values.

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