SAF OP-STOP DCI - Manual (Page 15)

OP-STOP DC INJECTION BRAKE
Page 10
3.5 FAULTS
When a fault exists the OP-STOP DCI relay is de-energized, preventing a properly interlocked
starter from being activated. When an OP-STOP is used in conjunction with a SAF OPAL starter,
this interlock is also carried out through signals passed by the ribbon cable at OPT. When no faults
exist and DC injection is not active, the DCI relay is energized. Therefore, if the 115 VAC supply
is not present the "fail-safe" interlock will prevent the use of the starter. The faults are explained
below.
3.5.1 PHASE LOSS
If the single phase power ( 200-600V ) to L1 and L2 terminals is not present, NE1 will be off
and the DCI relay de-energized. When this condition is corrected the unit will allow the starter
to be energized.
3.5.2 INSTANTANEOUS OVER CURRENT (IOC)
If the current feedback exceeds 1000% of the current setup by the burden resistor (Rb), the unit
will trip on IOC and de-energize the DCI relay. LD2 will be illuminated to indicate an IOC
fault and is reset via SW1, RESET. Causes of this fault may be a shorted output or simply a
burden resistor sized too small. Refer to Section 4.4 for burden table.