Dfi (Direct Fault Indicator); Table 2-4 Dfi Connector Pinout - Elgar SW 5550AE Operation Manual

Installation
2.7.3

DFI (Direct Fault Indicator)

The DFI connector on the rear panel has both input and output functionality.
The DFI Output Relay indicates a shutdown fault has occurred on the SW. It is a SPST
reed relay with rear panel connections to the normally closed output contacts. When
the SW is operating the relay is energized so that the contacts are open. When a fault
occurs, or if the unit should lose power, the relay closes to indicate a fault has occurred.
The DFI Output Relay will remain latched until the front panel Power switch is cycled.
The DFI Input Signal is used to command the SW to open the Output relay, and close
the DFI relay. It is a TTL-compatible input with a 1 kΩ input impedance, a 10 kΩ pullup
to +5 VDC, and clamping diodes to +5 VDC and ground. A signal with a negative going
edge from +5 VDC to ground will trigger the DFI response.
Refer to Figure 2–3, Item 5.
PIN #
1
2
3
4 and 5
6
7
8
9
2-8
MNEMONIC
DFI RLY COMM
Not Used
DFI IN +
Not Used
DFI RLY N.O.
Not Used
DFI IN RTN
IEEE 488.2
Table 2–4 DFI Connector Pinout
SW 5550AE • SW 3700AE • SW 1850AE
LEVEL
—
—
Ω
TTL (10 k input impedance)
—
—
—
TTL
SIGNAL GND
Operation Manual