Comtech EF Data HPCST-5000 - Manual (Page 64)

Single Thread System Installation High-Power TWTA Satellite Terminals
2–18 Rev.1
2.3.4.1 TWTA Monitor & Control (J1)
The TWTA is controlled using a discrete signal type interface. Table Chapter 2-2 lists
the pinouts for the 32-pin M&C connector.
Table Chapter 2-2. TWTA Monitor & Control Pinouts
Type Pins Functions
Control Commands
(All active low)
a
F
J
X
Z
AC Power ON
High Voltage Enable
Heater Standby
Fault Reset
Control Common (TWT GND)
Status Indicators, digital outputs
(unless specified, all active low)
A
C
G
H
K
M
R
S
T
U
W
Helix/Arc Fault Latched
Helix/Arc/Fault
Heater Timer Complete
TWT Temperature Fault
High Voltage ON
Fan ON
High Voltage Fault
EXT Fault (Active = High)
Summary Fault
Fan Lock
Status Return (Floating Common)
Status Indicators, analog outputs b
D
L
N
P
Reserved
Helix Current
High Voltage Monitor
VDC/Analog Return (TWT GND)
TWT Temperature
Output Voltages
(power on indicator) E
V
B
+15 VDC (100 mA max.)
+24 VDC (100 mA max.)
Chassis Ground
Ext. Voltage Input Y +5/15 VDC external supply input
Notes:
1. AC Power ON (Pin A) — Connect to ground (Pin Z) to apply power to unit.
2. High Voltage Enable (Pin F) — Connect to ground (Pin Z) to turn high
voltage ON.
3. Heater Standby (Pin J) — Connect to ground (Pin Z). The HV Enable
command overrides this command when enabled. If the HV Enable is
removed, TWT will return to a reduced TWT heater voltage.
An external control and monitor device may be connected to the TWTAs for operation of
the power amplifier. The optional EFData HPC-1200 controller can be used for this
purpose.