Emerson Digitax ST User Manual

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Digitax ST User Guide 183
Issue: 5
14 Diagnostics
The display on the drive gives various information about the status of the
drive. These fall into three categories:
• Trip indications
• Alarm indications
• Status indications
14.1 Trip indications
If the drive trips, the output of the drive is disabled so that the drive stops
controlling the motor. The upper display indicates that a trip has
occurred and the lower display shows the trip. If this is a multi-module
drive and a power module has indicated a trip, then the lower display will
alternate between the trip string and the module number.
Trips are listed alphabetically in Table 14-1 based on the trip indication
shown on the drive display. Refer to Figure 14-1.
If a display is not used, the drive LED Status indicator will flash if the
drive has tripped. Refer to Figure 14-2.
The trip indication can be read in Pr 10.20 providing a trip number. Trip
numbers are listed in numerical order in Table 14-2 so the trip indication
can be cross referenced and then diagnosed using Table 14-1.
Example
1. Trip code 3 is read from Pr 10.20 via serial communications.
2. Checking Table 14-2 shows Trip 3 is an OI.AC trip.
3. Look up OI.AC in Table 14-1.
Perform checks detailed under Diagnosis.
Figure 14-1 Keypad status modes
Figure 14-2 Location of the status LED
Users must not attempt to repair a drive if it is faulty, nor
carry out fault diagnosis other than through the use of the
diagnostic features described in this chapter.
If a drive is faulty, it must be returned to an authorized
Control Techniques distributor for repair.
WARNING
Keypad
display
Comms
code
No. Trip
3 OI.AC
Healthy Status Alarm Status Trip Status
Status Mode
Drive status =
tripped
Trip type (UU =
undervolts)
Status LED
Non flashing:
Normal status
Flashing:
Trip status
Trip Diagnosis
OI.AC Instantaneous output over current detected
3
Over current threshold is Kc/0.45 (see the Digitax ST Advanced User Guide for Kc values)
Acceleration /deceleration rate is too short.
If seen during autotune reduce voltage boost Pr 5.15
Check for short circuit on output cabling
Check integrity of motor insulation
Check feedback device wiring
Check feedback device mechanical coupling
Check feedback signals are free from noise
Is motor cable length within limits
Reduce the values in speed loop gain parameters – Pr 3.10, Pr 3.11 and Pr 3.12
Has offset measurement test been completed?
Reduce the values in current loop gain parameters - Pr 4.13 and Pr 4.14

Emerson Digitax ST Specifications

General

Brand	Emerson
Model	Digitax ST
Category	Controller
Language	English