5-2 The Man-Machine Interface (MMI)
590 Series DC Digital Converter
LED Indications
There are six LEDs that indicate the status of the Converter. 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 Converter State
{
Drive fault condition
z
Drive normal condition
RUN Converter 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 Converter State
{
Start contactor is Open
z
Start contactor is Closed (by a start instruction). The drive
is healthy
PROGRAM STOP Converter 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 Converter 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 Converter 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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