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TW 3700 • TW 5550
2 .7 .1
B NC CONNE CT OR S
The diagram below illustrates the signal and return connections. Refer to Figure 2-3,
Items 1 and 2.
2 .7 .2
DF I (DI S CR E T E F AU L T I NDI CAT OR )
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 TW. It is a SPST
reed relay with rear panel connections to the normally closed output contacts. When
the TW 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 Input Signal is used to command the TW 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
Elgar TrueWave
MNEMONIC
DFI RLY COMM
Not Used
DFI IN +
Not Used
DFI RLY N.O.
Not Used
DFI IN RTN
IEEE 488.2
Table 2-3 DFI Connector Pinout
LEVEL
—
—
TTL (10 kΩ input impedance)
—
—
—
TTL
SIGNAL GND
Installation
2-7
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