Curtis MultiMode 1207B Manual page 35

Curtis 1207B Manual
Emergency reverse
Emergency reverse is activated when the brake is released, KSI is activated,
and the emergency reverse switch (the BB, or "belly button" switch) is pressed.
After the BB switch is released, normal controller operation is not resumed
until neutral (no direction) is selected or until the brake is cycled (brake, then
brake release). However, repeatedly pressing the BB switch will reactivate the
emergency reverse function each time.
Because emergency reverse immediately powers the reverse contactor, some
arcing may occur.
Fault detection
An internal microcontroller automatically maintains surveillance over the func-
tioning of the controller. When a fault is detected, the appropriate fault code is
signalled via the LED, externally visible on top of the controller. The diagnostic
codes flashed by the LED are listed in Section 5, Troubleshooting.
If the fault is critical, the controller is disabled. More typically, the fault is
a remediable condition and temporary—for example, an undervoltage fault is
cleared when the condition is removed.
The automatic fault detection system includes:
contactor coil open / shorted driver (F/R and shunt contactors)
contactor driver overcurrent / contactor coil short
contactor welded
emergency reverse circuit check
M- output fault
memory checks upon start-up
overvoltage cutoff
power supply out of range (internal)
throttle fault
undervoltage cutback
watchdog (external and internal)
watchdog (internal)
Fault recording
Fault events are recorded in the controller's memory. Multiple occurrences of
the same fault are recorded as one occurrence.
The fault event list can be loaded into the programmer for readout. The
Fault » Fault History menu provides access to the controller's diagnostic history
file—the entire fault event list created since the diagnostic history file was last
cleared. The Fault » System Faults menu, on the other hand, provides informa-
tion about only the currently active faults.
APPENDIX A: GLOSSARY
A-3