Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual - Manual (Page 310)

310 Rockwell Automation Publication 750-PM001J-EN-P - October 2014
Chapter 6 Troubleshooting
Power Layer Interface (PLI)
Board 7-Segment Display PowerFlex 755 Frame 8 and larger drives utilize a pair of 7-segment displays to
indicate drive status and conditions.
Series A Display
Series B Display
Lit Segment Indication Description
Fault Clear Indicates a fault condition has been cleared.
Fault Indicates a fault condition exists.
Power On Indicates that power is applied to the PLI board.
Charged Indicates the state of the pre-charge pin.
PWM Enable IGBT gating is enabled. When disabled, all IGBT signal inputs to the PLI IGBT
driver chip are low. IGBT gating is enabled by setting bit 0 of the Config Register.
IGBT gating is disabled by clearing bit 0 or by “POE” fault (IOC, Bus Overvoltage,
or Ground Fault).
Fiber Loss Fault Turns on when a Fiber Loss fault occurs. A Fiber Loss fault occurs when the LOS
signal is high or when a valid data packet has not been received for a period of
1024 μs. The fault is latched and is cleared be setting bit 8 of the Config Register.
The Fiber Loss fault inhibits IGBT firing in the same manner as a “POE” fault.
Fiber Loss Pin Indicates the actual state of the LOS pin described in Write Enable.
SAFE Vcc Power On Power is applied to the PLI IGBT driver chip (U14). Delayed for 12 seconds after
power up.
Write Enable Data writes from the Fiber Optic link are enabled to PLI registers. Data writes are
disabled for ten seconds (time required for the Control Board to initialize) after
negation of the LOS pin of the PLI fiber optic transceiver. LOS is driven high when
the optical power into the fiber optic receiver is too low (broken, crimped,
disconnected fiber, or transmitter at opposite end of fiber is not operating.
Lit Segment Indication Description
PWM Enable IGBT gating is enabled. IGBT gating is enabled by setting bit 0 of the Config
Register. IGBT gating is disabled by clearing bit 0 or by fault.
Fault Indicates a fault condition exists.
Initialization Done Indicates that the control has initialized the PLI board.
Fiber Loss Actual state of the LOS pin. LOS is driven high when the optical power into the
fiber optic receiver is too low (broken, crimped, disconnected fiber, or
transmitter at opposite end of fiber is not operating.
On Line The PLI is powered.
System Safety
Enable B Pin 1 of the 541 PLI IGBT driver chip (U14) is low. This pin must be low to fire the
IGBTs.
Aux Power The PLI board is powered by a 24 volt auxiliary supply.