Diagnostics 9-5
1560D-UM051D-EN-P – February 2005
Open Gate (Start A,B,C firing fault)
Open gate indicates that an abnormal condition that causes faulty firing (i.e.,
open SCR gate or driver system) 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 (>85°C) of the SCRs by using internal thermistors.
When the controller detects an over-temperature condition, the micro-
processor 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.
The temperature signal line is also used as a control signal. A "Controller
Temp" trip may also indicate a problem with other hardware in the system
(loss of gate driver board power during starting or stopping). Refer to
Table 10.A.
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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