Product Description
The Thyristor Firing Unit is a plug-in control module designed for the control of power thyristors in power
converter circuits. It generates four 0-5 V pulse signals in the single-phase control mode, and six in the 3-phase
mode. These control or “firing” signals are brought out to a 9-pin socket and can be routed to the Power
Thyristors, Model 8841, through the use of an included mating 9-pin socket. The firing angle is determined by a
low-level dc signal applied at the angle control input. The dc source output on the front panel can be used to
produce this control signal. Four conversion functions can be selected to change the direction, and the rate of
change of the firing angle which can be easily monitored on a 7-segment display on the front panel. A
synchronization signal from the ac network is applied at safety 4 mm sockets.
Specifications
Control Input
Level - -10 to +10 V
Input Impedance - 1MΩ
DC Source
Voltage Range -10 to +10 V
Output Impedance - 1kΩ
Control Outputs
Number of Output Signals - 7
Level - 0-5 V (TTL compatible)
Operating Frequency - 50/60Hz
Output Impedance - 300 Ω
Cosmetic Notes:
Minor scuffing and dust on outer frame, cosmetic in nature, see pictures. We have more than one, so you may not get the exact item pictured, but they are all in similar cosmetic condition. If you would like to receive pictures of the exact unit/units you will receive please send us a request.
Testing and Functional Notes:
This item is TESTED & WORKING, as pictured. See above for any additional notes.
converter circuits. It generates four 0-5 V pulse signals in the single-phase control mode, and six in the 3-phase
mode. These control or “firing” signals are brought out to a 9-pin socket and can be routed to the Power
Thyristors, Model 8841, through the use of an included mating 9-pin socket. The firing angle is determined by a
low-level dc signal applied at the angle control input. The dc source output on the front panel can be used to
produce this control signal. Four conversion functions can be selected to change the direction, and the rate of
change of the firing angle which can be easily monitored on a 7-segment display on the front panel. A
synchronization signal from the ac network is applied at safety 4 mm sockets.
Specifications
Control Input
Level - -10 to +10 V
Input Impedance - 1MΩ
DC Source
Voltage Range -10 to +10 V
Output Impedance - 1kΩ
Control Outputs
Number of Output Signals - 7
Level - 0-5 V (TTL compatible)
Operating Frequency - 50/60Hz
Output Impedance - 300 Ω
Cosmetic Notes:
Minor scuffing and dust on outer frame, cosmetic in nature, see pictures. We have more than one, so you may not get the exact item pictured, but they are all in similar cosmetic condition. If you would like to receive pictures of the exact unit/units you will receive please send us a request.
Testing and Functional Notes:
This item is TESTED & WORKING, as pictured. See above for any additional notes.
