The trips can be grouped into the following categories. It should be noted that a trip can only occur when the drive is not tripped or is already tripped

but with a trip with a lower priority number.

Table 12-4 Trip categories

Priority

Internal / Hardware trips

Trips {HF01} to {HF23} are internal faults that do not have trip numbers, except HF08, HF11, HF12 and HF18. If one of these trips occurs, the main

drive processor has detected an irrecoverable error. All drive functions are stopped and the trip message will be displayed on the drive keypad. If a

non permanent trip occurs this may be reset by power cycling the drive. On power up after it has been power cycled, the drive will trip on Stored HF

(the sub-trip number indicates the HF fault code). Enter 1299 in mm.000 to clear the Stored HF trip.

12.6

Alarm indications

In any mode, an alarm is an indication given on the display by alternating the alarm string with the drive status string display. If an action is not taken

to eliminate any alarm except "Auto Tune", "Limit Switch" and 24V Backup Lost" the drive may eventually trip. Alarms are not displayed when a

parameter is being edited.

Table 12-5 Alarm indications

Alarm string

Brake resistor overload. Braking Resistor Thermal Accumulator (10.039) in the drive has reached 75.0 % of the value at which

Brake Resistor

the drive will trip.

Motor Protection Accumulator (4.019) in the drive has reached 75.0 % of the value at which the drive will trip and the load on

Motor Overload

the drive is >100 %.

Drive Overload

Drive over temperature. Percentage of Drive Thermal Trip Level (07.036) in the drive is greater than 90 %.

Auto Tune

The autotune procedure has been initialized and an autotune in progress.

Limit Switch

Limit switch active. Indicates that a limit switch is active and that is causing the motor to be stopped.

Option Slot 1

Option slot alarm

Low AC

Low voltage mode. See Low AC Alarm (10.107).

Current limit

Current limit active. See Current Limit Active (10.009).

24V Backup Lost

24V Backup not present. See 24V Alarm Loss Enable (11.098)

158

Electrical

Getting

Basic

installation

started

parameters

Trips

HFxx

{Stored HF}

Trip numbers 218 to 247, {Slot 1 HF}

{EEPROM Fail}

Trip numbers 174, 175

and 177 to 188

{PSU}

{OI.ac}, {OI Brake} and {Fan Fail}

{Phase Loss} and

{OHt dc bus}

All other trips

Running

NV Media Card

Optimization

the motor

Operation

These indicate internal problems and cannot be reset. All drive

features are inactive after any of these trips occur.

This trip cannot be cleared unless 1299 is entered into

Parameter (mm.000) and a reset is initiated.

These trips cannot be reset.

This can only be reset if Parameter mm.000 is set to 1233 or

1244, or if Load Defaults (11.043) is set to a non-zero value.

These trips are priority 5 during power-up.

Rectifier 24 V

These trips cannot be reset until 10 s after the trip was initiated.

The drive will attempt to stop the motor before tripping if a

{Phase Loss} trip occurs unless this feature has been disabled

(see Action On Trip Detection (10.037). The drive will always

attempt to stop the motor before tripping if an {OHt dc bus}

occurs.

Description

Onboard

Advanced

Diagnostics

PLC

parameters

Comments

Unidrive M400 Control User Guide

Issue Number: 1

information

Table of Contents

Internal / Hardware Trips; Alarm Indications - Emerson Unidrive M400 Series User Manual