Sandel ST3400 - Electrical Installation and Wiring

Signal Type Electrical Characteristics (cont.)
Outputs
Signal Type
Nom Range
Absolute
Note 3
Max
Load (Ω)
A429
+/- 5Vdc
70mAdc
2K (Minimum)
RS232
+/- 5Vdc
70mAdc
500 (Minimum)
A575
3.54 mA +/-1%
25mA
500
Audio Output (LL)
0 to 27.2V
pk-pk
27.2V
pk-pk
600
Audio Output (Spkr)
0 to 4 Watts Max RMS into 8 ohms
16V
pk-pk
8 (inductive)
Open Drain
1Ω or High Impedance (over current
protected)
250mAdc
>350K
Notes:
1. At +28Vdc, nominal current is 1.4Adc +/- 5%, 1 minute after start up.
2. Power On Load = 60.4K. For Glideslope there may need to be a 1K load somewhere else in the system to
meet the receiver load requirements. Check installation instructions for the interfaced receiver.
3. Outputs are protected against shorts to ground. Shorts to power supply may cause damage to components.
4. Discrete inputs actively pulled to 27.5v through 30k ohms when selected ‘active low’ or actively pulled to 0v
through 30k ohms when selected ‘active high’ in the maintenance pages. This ensures the input is in the
‘inactive’ state if an external connection fails. If interfacing to discrete signals which do not supply a “hard”
0v/27.5 volt transition, any input network may be used that ensures that the discrete input pin is not within
1.0v from its nominal threshold shown in the table either in the active or inactive state.
4-12 ST3400 INSTALLATION MANUAL 82002-IM-L