Nidec Unidrive M400 series User Manual

64 Unidrive M400 Quick Start Guide
Issue Number: 8
8.1 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 "tuning”, “LS" or
“24.LoSt” the drive may eventually trip. Alarms are not displayed when a parameter is being edited.
Table 8-2 Alarm indications
Thermistor
Motor thermistor over-
temperature
The Thermistor trip indicates that the motor thermistor
connected to terminal 14 (digital input 5) on the control
connections has indicated a motor over temperature.
User OI ac User OI ac
The User OI ac trip is initiated if the output current of the
drive exceeds the trip level set by User Over Current
Trip Level. Refer to the Control User Guide.
User Prog Trip
Trip generated by an onboard
user program
This trip can be initiated from within an onboard user
program
User Program On board user program error
An error has been detected in the onboard user program
image.
User Save User Save error / not completed
The User Save trip indicates that an error has been
detected in the user save parameters saved in non-
volatile memory.
Watchdog
Control word watchdog has
timed out
The Watchdog trip indicates that the control word has
been enabled and has timed out
Alarm string Description
Brake
Resistor
Brake Resistor overload. Braking Resistor Thermal Accumulator in the drive has
reached 75.0 % of the value at which the drive will trip.Refer to the Power
Installation Guide.
Motor
Overload
Motor Protection Accumulator in the drive has reached 75.0 % of the value at
which the drive will trip and the load on the drive is >100 %, reduce motor current
(load). Refer to the Parameter Reference Guide
Drive
Overload
Drive over temperature. Percentage Of Drive Thermal Trip Level in the drive is
greater than 90 %. Refer to the Parameter Reference Guide
Autotune 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.
Low AC Low voltage mode. See Low AC Alarm in Control User Guide.
Current Limit Current limit active. See Current Limit Active in Control User Guide.
24V Backup
Lost
24V backup not present. See 24V Alarm Loss Enable in the Control User Guide.
Trip code Condition Description

Nidec Unidrive M400 series Specifications

General

Brand	Nidec
Model	Unidrive M400 series
Category	Controller
Language	English