Wesley BC-6200-8SA - Manual (Page 36)

30 Curtis 1268 Manual, Rev. D
3 — PROGRAMMABLE PARAMETERS: Output Driver Parameters
DRV OVRCUR DIS
The driver overcurrent detection disable parameter disables the controller’s
driver overcurrent detection. The overcurrent detection mechanism acts to
protect the main contactor and auxiliary drivers in the event they are con-
nected to a load with too little resistance. This can occur due to miswiring or a
defective peripheral device. For example, a fault condition could occur from a
direct connection to B+ or from a short in the windings of a contactor coil or
EM brake. In such cases, the controller must recognize the condition quickly
and turn the driver Off before it is permanently damaged by excessive current.
However, because of the speed of the detection, electrical noise (which the con-
troller is subjected to during EMI testing) may cause the detection mechanism
to trigger a nuisance fault.
DRV OVRCUR DIS = off (default setting)
When the parameter is programmed Off, overcurrent detection is not
disabled, and the controller will detect an overcurrent situation.
DRV OVRCUR DIS = on
When the parameter is programmed On, overcurrent detection is
disabled. This leaves the main contactor and auxiliary drivers unpro-
tected from coil shorts and miswiring. However, it may be desirable
to set the parameter On temporarily during EMI testing.