SSD 605C Product Manual - Rips and

Trips and Fault Finding  

7-1

605C Frequency Inverter

7 

T

RIPS AND 

F

AULT 

F

INDING

Trips

What Happens when a Trip Occurs

When a trip occurs, the Inverter’s power stage is immediately disabled causing the motor and

load to coast to a stop. The trip is latched until action is taken to reset it. This ensures that trips

due to transient conditions are captured and the Inverter is disabled, even when the original

cause of the trip is no longer present

Inverter Indications

If a trip condition is detected the unit displays and performs the following actions.

1.  The HEALTH LED flashes indicating a Trip condition has occurred. (Investigate, find and

remove the cause of the trip.)

1.  The programming block SEQUENCING LOGIC::TRIPPED signal is set to TRUE.

The DIGITAL OUTPUT 1 (HEALTH) digital output changes between TRUE/FALSE,

depending on the output logic.

Operator Station Indications (when connected)

If a trip condition is detected the MMI displays and performs the following actions.

1.  The HEALTH LED on the Operator Station flashes indicating a Trip condition has

occurred and a trip message is displayed stating the cause of the trip.

2.  The programming block SEQUENCING LOGIC::TRIPPED signal is set to TRUE.

The DIGITAL OUTPUT 1 (HEALTH) digital output changes between TRUE/FALSE,

depending on the output logic.

3.  The trip message(s) must be acknowledged by pressing the E key. Refer to Chapter 5: “The

Operator Station” - Alert Message Displays.

Resetting a Trip Condition

All trips must be reset before the Inverter can be re-enabled. A trip can only be reset once the

trip condition is no longer active, i.e. a trip due to a heatsink over-temperature will not reset

until the temperature is below the trip level.

Note:  More than one trip can be active at any time. For example, it is possible for both the

HEATSINK TEMP and the LINK OVERVOLTS trips to be active. Alternatively it is possible

for the Inverter to trip due to an OVERCURRENT error and then for the HEATSINK TEMP

trip to become active after the Inverter has stopped (this may occur due to the thermal

time constant of the heatsink).

Reset the trip(s) using the remote trip reset input, or by pressing the STOP/RESET key on the

Operator Station.

Success is indicated by the HEALTH LED (on the unit or MMI) ceasing to flash and returning

to a healthy “ON” state. The programming block  SEQUENCING LOGIC::TRIPPED output is

reset to FALSE.

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