Vestil EPT-30 - Manual (Page 65)

65
Curtis PMC 1207/1207A Manual A-10
APPENDIX A: GLOSSARY
The ramp start current limit is adjustable via the handheld programmer. The
Mode 1 and Mode 2 ramp start current limits can be set independently.
Reset
Almost all faults require a cycling of the KSI or brake input to reset the controller
and enable operation; see Fault recovery for exceptions.
Sequencing delay
Sequencing delay allows the brake to be cycled within a set time (the sequencing
delay), in order to prevent inadvertent activation of HPD or SRO. This feature
is useful in applications where the brake switch may bounce or be momentarily
cycled during operation. The delay can be set with the handheld programmer
from 0 to 3 seconds, where 0 corresponds to no delay.
Shunt field control
The shunt field of a compound motor can be directly controlled by using the
shunt winding driver (if the current requirement meets the contactor driver
specifications). The shunt is activated while a direction is selected, as long as the
controller is not in plug braking mode. A programmable delay is available for the
shunt drive. This delays the shunt turn-on until some time after the reversing
contactors have shuttled. The delay can be set with the handheld programmer
from 0 to 0.5 seconds, where 0 corresponds to no delay.
Smooth, stepless operation
Like all Curtis PMC 1200 Series controllers, the 1207 and 1207A models allow
superior operator control of the vehicle’s drive motor speed. The amount of
current delivered to the motor is set by varying the “on” time (duty cycle) of the
controller’s power MOSFET transistors. This technique—pulse width modula-
tion (PWM)—permits silent, stepless operation.
Speed settings
The maximum speed setting defines the upper-limit speed as a percentage of
PWM output at full throttle. If you have a MultiMode™ controller, the
maximum speed settings in Mode 1 and in Mode 2 are independently adjustable
via the handheld programmer. If you have a 1207 controller with the MultiMode™