590 Series DC Digital Drive The MAN - MACHINE INTERFACE (MMI) 6-5
LED Indications
There are six LEDs that indicate the status of the Drive. Each LED is considered to operate in two different ways:
The LEDs are labelled HEALTH, RUN, START CONTACTOR, PROGRAM STOP, OVER CURRENT
TRIP, and COAST STOP. The status of the LEDs have the following meanings:
HEALTH Drive State
{
Drive fault condition
z
Drive normal condition
RUN Drive State
{
Drive not enabled:
• the thyristor bridge is disabled
• the main contactor control relay is de-energised
• an alarm is present
z
Drive in run condition
Drive is healthy (as indicated by the HEALTH LED)
Ready (which requires a Start instruction) and enabled; indicates that the controller is in a normal run
condition. The main contactor control relay is energised and the thyristor bridge is enabled.
START CONTACTOR Drive State
{
Start contactor is Open
z
Start contactor is Closed (by a start instruction). The drive is healthy
PROGRAM STOP Drive State
{
The program stop line is open and the program stop is carried out until main contactor drop-out occurs
z
No program stop (+24V is applied to terminal B8)
OVER CURRENT TRIP Drive State
{
Armature current exceeded 280% full load. The drive has tripped, refer to Chapter 7: “Trips and Fault
Finding” - Trip Messages (OVER I TRIP)
z
Armature current normal
COAST STOP Drive State
{
Hardware stop by main contactor drop-out
z
Stop not active (+24V is applied to terminal B8)
In normal run condition, all LEDs on the MMI are illuminated. Any LED which is off indicates a condition which prevents operation of the controller.
HINT: The general rule for LED indications is “ON IS GOOD, OFF IS BAD”
{
OFF
z
ON
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