Rockwell-automation 150 USE MN/SMC DIALOG + CONTROLLER Manual do Utilizador descarregar pdf (Página 148)

Diagnostics

9-5

Open Gate

Open gate indicates that an abnormal condition that causes faulty

firing (i.e., open SCR gate) has been sensed during the start sequence.

The SMC Dialog Plus controller will attempt to start the motor a total

of three times before the controller shuts down.

Excess Starts/Hour

Excess starts/hour is displayed when the number of starts in a one

hour period exceeds the value programmed.

Controller Temp

Controller temp is an indication that a power pole’s maximum rated

temperature has been reached. The controller’s microprocessor

monitors the temperature of the SCRs by using internal thermistors.

When the controller detects an overtemperature condition, the

microprocessor turns off the SCRs and displays the appropriate fault

code.

An overtemperature condition could indicate the presence of

inadequate ventilation, high ambient temperature, overloading, or

excessive cycling.

If an overtemperature condition exists at start-up, the SCR gate

signals will be inhibited and the controller will trip and indicate the

fault. The fault can be immediately reset. However, the motor cannot

be restarted until after the controller temperature falls below trip

levels.

Comm Fault

The SMC Dialog Plus controller disables control through the serial

communication port as the factory default. To enable control, the

Logic Mask parameter (#85) found in the Linear List programming

group must be set to “4.” With Series B human interface modules,

this can also be accomplished by enabling control logic through the

Control Status programming group.

If a Bulletin 1201 human interface module or Bulletin 1203

communication module is disconnected from the SMC Dialog Plus

controller when control is enabled, a Comm Fault will occur.

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Rockwell-automation 150 USE MN/SMC DIALOG + CONTROLLER Manual do Utilizador Página 148