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APPENDIX A: GLOSSARY
Curtis 1207B Manual
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APPENDIX A
GLOSSARY OF FEATURES AND FUNCTIONS
Acceleration/deceleration rate
The acceleration rate is the time required for the controller to increase from
0% to 100% duty factor. The shape of the acceleration curve is controlled by
the dynamic throttle response, which is linear.
The acceleration rates in Mode 1 and in Mode 2 are independently adjust-
able via the handheld programmer.
Anti-tiedown
Before enabling Mode 1 operation, the anti-tiedown function checks that the
mode selection switch has been released after the last cycling of the brake switch.
This feature discourages operators from taping or otherwise “tying down” the
mode switch. If Mode 1 is already selected before the brake is released, the
controller remains in Mode 2 until the mode switch is released and pressed
again.
Arcless contactor switching
The controller output duty factor is quickly reduced to zero any time a direc-
tion is de-selected, so that the controller current will be reduced to zero before
the direction contactor drops out.
BB
(see
Emergency reverse)
Brake
The brake must be released (brake input “high”) for the controller to operate.
This is a safety interlock used on most material handling vehicles.
Cycling the brake or KSI clears most faults and enables operation.
Contactor drivers and circuits
The1207B controller can accommodate up to four external contactors: forward,
reverse, main, and shunt. Some vehicles may have no main contactor, or the
main contactor may be wired directly to the KSI or brake signal, bypassing
the controller.
Various protections provided for the contactor drivers ensure that the con-
tactors operate correctly; see
Fault detection.
