General Faults - Nidec Digistart D3 User Manual

Display
The motor has experienced a sharp drop in power, caused by loss of load. Causes can include
Underpower
broken components (shafts, belts or couplings), or a pump running dry.
Related Pr: 5E, 6B, 16D
This trip is not adjustable.
Unsupported option
The selected function is not available (eg jog is not supported in inside delta configuration).
(function not available in
Related Pr: None
inside delta)
This is a name selected for a programmable input. See Input A trip.
Vibration
Where 'X' is 1, 2 or 3.
VZC Fail Px
Internal fault (PCB fault). Contact your local supplier for advice.
This trip is not adjustable.
Related Pr: None
9.3

General Faults

This table describes situations where the soft starter does not operate as expected but does not trip or give a
warning.
Symptom
Starter "Not Ready"
The soft starter does not respond to
the START or RESET button on the
keypad.
The soft starter does not respond to
commands from the control inputs.
The soft starter does not respond to a
start command from either the local or
remote controls.
A reset does not occur after an
Auto-Reset, when using a remote
two-wire control.
Non-resettable Thermistor Cct trip,
when there is a link between the
thermistor input TH1, TH2 or when
the motor thermistor connected
between TH1, TH2 is permanently
removed.
Digistart D3: User Guide
Issue: G
Possible cause/Suggested solution
Check Input A (DI4, +24V). The starter may be disabled via a
•
programmable input. If Pr 3A or 3F is set to Starter Disable and there is
an open circuit on the corresponding input, the Digistart D3 will not start.
The soft starter may be in Remote control mode. When the soft starter is
•
in Remote control mode, the Local LED on the starter is off. Press the
LCL/RMT button once to change to Local control.
The soft starter may be in Local control mode. When the soft starter is in
•
Local control mode, the Local LED on the starter is on. Press the
LCL/RMT button once to change to Remote control.
The control wiring may be incorrect. Check that the remote start, stop
•
and reset inputs are configured correctly (see Start/Stop control logic on
page 24 for details).
The signals to the remote inputs may be incorrect. Test the signalling by
•
activating each input signal in turn. The appropriate remote control input
LED should activate on the starter.
The soft starter may be waiting for the restart delay to elapse. The length
•
of the restart delay is controlled by Pr 6G Restart Delay.
The motor may be too hot to permit a start. If Pr 5L Motor Temperature
•
Check is set to Check, the soft starter will only permit a start when it
calculates that the motor has sufficient thermal capacity to complete the
start successfully. Wait for the motor to cool before attempting another
start.
The starter may be disabled via a programmable input. If Pr 3A or 3F is
•
set to Starter Disable and there is an open circuit on the corresponding
input, the Digistart D3 will not start. If there is no further need to disable
the starter, close the circuit on the input.
NOTE
Pr 3M Local/Remote controls when the LCL/RMT button is
enabled.
The remote 2-wire start signal must be removed and reapplied for a
•
re-start.
The thermistor input is enabled once a link is fitted and short circuit
•
protection has activated.
- Remove the link then load the default parameter set. This will
disable the thermistor input and clear the trip.
- Place a 1k2 Ω resistor across the thermistor input.
- Turn thermistor protection to 'Log only' (Pr 16K).
Probable Cause
95