PROGRAMMING MODE
Optional Features
In this mode, programming can be done to control and adjust various parameters. To enter this mode two buttons Input and Auto/Man, are required to be pressed simultaneously, when pressed together display shows "LO"
LOW CUT
HIGH CUT
Here programming mode has been initiated. Now press one at a time out of these two buttons. One acts as a decrease and another one acts as an increase button. Set this reading to be desired low cut voltage. This reading is stored in memory. This reading can be mode to set from 100v-210v.
Now again press both buttons together, and the display shows "Hi". Here high voltage cut-off can be set with the help of the same buttons by pressing them individually. This reading can be made to set from 220v-280v.
TIME DELAY RELAY
Now again press both buttons together, and the display shows "TDR". Here time after which the replay should turn ON after every cold start or cut-off start. Time delay can be set with the help of the same buttons by pressing them individually. This reading can be made to set from 1-180sec.
SETTING
TOLERANCE SETTING
(Caution: This is strictly to be done by a skilled technician and only if necessary). Behind the front panel, there are two pots on the PBC. These are visible if seen from the top. Out of these two pots is sealed and another can be turned. If turned in one direction, the motor starts haunting, and then from here tune it reverse such that
(1) The motor just stops hunting and here it is with minimum tolerance, But here with a slight fluctuation in voltage, it will start correcting, in this way life of the carbon brush is also affected.
(2) Tune it a little further to achieve the required hysteresis tolerance. Normally it is tuned to have a tolerance of +/-3V.
DISPLAY/INDICATOR
Display Window: In normal operation, it shows the output voltage however when the input button is pressed then it shows the input voltage.
High: It is on when Servo Varian has reached its High extreme.
Low: It is on when Servo Varian has reached its low extreme.
Mains OFF: Servo output replay is off/ON: Servo output relay is on.
Blinking: Time Delay for the relay is in action. After set time it is going to turn ON.
SERVO MOTOR MOVEMENT
Input: It is ON whenever the Input Push button is pressed. During this time digital display reading shows input voltage otherwise it is output voltage in normal operation.
Auto: It is ON when the servo is operating in Auto mode.
PUSH BUTTON/SETTING
Input: This button when pressed, shows the input voltage in the digital display window.
Auto/ Man: This button is used to toggle between Auto mode and Manual Mode. It gets to Auto mode Immediately with the press of a button but for going to Manual mode from Auto It waits for some time (3-4 Sec.) for this button to be pressed continually. It has been done intentionally to make sure that this is intentional switching by an authorized person.
Buck: This is used to lower the voltage when in Manual mode. Boost: This is used to raise the voltage when in Manual mode.
This is to adjust the required output voltage. There is a pot inside this which can be tuned to reach the desired output voltage. Servo makes sure that it maintains that voltage with the +/- a hysteresis tolerance. Normally this can be set from 200V to 250V
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