Comtech EF Data RC-1160 - Manual (Page 63)

Theory of Operation Revision 1
RC-1160 RC-1260 Redundancy Switch Controllers MN-RC1160RC1260
C-3
C.3 Waveguide Switch Driver
The AC waveguide switch assembly (PL/6208), converts the CMOS pulses that enter on header P11 from the
logic control PWB. The pulses range from 90 to 240 VAC. The pulses go through IC modules U1 through U5.
• Modules U2 through U5 will automatically activate, depending on the requested configuration.
• Module U1, the AC power return, is triggered on all commands.
The modules contain opto-isolators, zero voltage cross-over detectors, and triac output drivers with snubbers to
ensure noise-free switch-over.
Relay K1, in a de-energized state, switches primary AC to the waveguide modules through resistor R1.
The logic control board will energize K1 when there is a loss of the primary +15 VDC. In case a waveguide
switch command is accidentally tied to ground externally, resistor R1 will limit the current, preventing damage
to modules U1 to U5.
The DC waveguide switch board (PL/6209), uses two AC/DC power supplies (PS1 and PS2). Primary and
secondary power sources facilitate both units. PS1 and PS2 outputs are selected at either 28 or 48 volts by slide
switch “S1”; they are then “or’d” together through diode CR5.
The pulse switching modules U1 through U8 act together to create the DC pulse on one of the four outputs. The
two DC voltages are also divided down with resistors R2 and R3 and sent to the logic control board for
monitoring.
C.4 Front Panel Display
The front panel display receives the logic low active signal from the logic control board and illuminates the
appropriate LED. When the unit is in local mode, connector P16, pin1 will be at logic zero, which enables the
Lamp test and other momentary command switches. All front panel switches are enabled.
The local/remote switch, S6, is tied to ground, at all times, to retain the ability to switch to local control.
For RC-1160 only: Jumper JP1 ties to ground only, which is sampled by the microprocessor on power-up. This
function allows the controller to configure for a 1:1 redundancy.