Woodward ProTech 203, Руководство по эксплуатации

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Manual 85204 ProTech 203 Overspeed Protection System
Woodward 11
Figure 3-3. Voter Relay Configuration
This configuration makes testing of the voter relays in the system a relatively
simple operation. Six relay status indicator LEDs (STATUS A1, STATUS A2,
STATUS B1, STATUS B2, etc.) are mounted on the control panel. Each LED is
on when its corresponding relay is tripped. You may overspeed each of the three
speed-sensing circuits, one at a time, using a built-in frequency generator. You
may then watch the LED indicators and the speed readout to see that each of the
six individual voter relays trip at the correct speed. Because of the series/parallel
configuration of the trip relays, overspeeding one of the speed sensing circuits at
a time will not disturb the load.
Operator Interface
Each speed-sensing unit of the ProTech 203 system includes a touchpad, a
two-line by 16-character LCD display, and a potentiometer for adjusting the
overspeed test frequency. A single keyswitch is connected to all three speed-
sensing units to control whether the system is in the MONITOR or the
PROGRAM mode, preventing unauthorized changes.
Power Supply Description
The ProTech 203 consists of three units (A, B, and C). Each unit has its own
separate power supply. There are three different versions of power supplies
which have the following input voltages: 18–32 Vdc, 90–150 Vdc/88–132Vac,
and 180–264 Vac.
Each unit power supply pr5 V and +24 V. These voltages are isolated
from the input voltage. The +24 V for all three units are "or-ed" together to
provide power to the interposing relay.