6.3 Adjusting the amplifier card
Working steps
You should adhere to the following sequence: Plug jumpers
Install card
Adjust command values
Adjust command value zero point
± 100 % = ± 10 V
Rectangular signal ±15V 10 mV to 10 V 10 mV to 10 V 10 mV to 10 V 10 mV to 10 V 10 mV to 10 V 10 mV to 10 V
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ternal command value is available
Option VT-.../T1 Proceeding: Precondition: No command value call-up may be activated. ➤ Set external command value selection to 0 V. ➤ Set the internal command value to 0 V using potentiometer “Zw“. Check the setting at measuring socket “w“.
Option VT-.../T5 Proceeding: ➤ Select the command value to be adjusted (1, 2, 3 or 4) by means of a call-up signal (command value call-up 1 to 4). ➤ Turn the measuring point selector switch to the command value to be adjusted (switch position 1, 2, 3 or 4 = command value call-up 1 to 4). ➤ Use the associated potentiometer “w1“ .. "w4“ (or the connected external potentiometer) to set the desired command value. Check the setting at measuring socket “v“. ✔ Now, you can adjust the next command value.
Option VT-.../T5 Proceeding: Precondition: No command value call-up may be activated. ➤ Set external command value selection to 0 V. ➤ Set measuring point selector switch to “6” ➤ Set the internal command value to 0 V using potentiometer “Zw“. Check the setting at measuring socket “v“.
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Commissioning the amplifier card
6.2 Adjustment and indicator elements
Fig. 6.1: Adjustment and indicator elements of amplifier card VT-VRPA2../T1
RE 30110-B/08.04
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Commissioning the amplifier card
Measuring point Internal command value Command value call-up 1 Command value call-up 2 Command value call-up 3 Command value call-up 4 Zero point offset “Zw“ 1 summation signal of command values Ramp output signal Free Clock frequency Ramp time “t1” Ramp time “t2” Ramp time “t3” Ramp time “t4” Ramp time “t5” Current ramp time “t”
mand value ± 100 % = ± 10 V
Actual value
± 100 % = ± 2.5 V
Moreover, a measuring socket (t) is provided for adjusting the ramp time. The measuring voltage range is between 10 mV and 10 V.
If you change the setting of the sealed potentiometers (“ramp time symmetry“ and “internal reference voltage“) warranty claims become void!
Before installing the card, make sure that all jumpers on the amplifier card are plugged correctly.
For taking measurements, use only measuring instruments having an internal resistance of (Ri) > 100 kΩ.
For adjusting the potentiometers and for changing the measuring point selector switch (VT-.../T5) over, use a screw driver with a blade width of 4 mm.
In addition, a measuring socket (v) is provided for adjusting the command values and the ramp times and for checking further internal signals. The measuring points can be selected by means of the measuring point selector switch on the front panel. The signal of the measuring socket (v) is additionally fed to the male connector.
Adjust the command value
Option VT-.../T1 Proceeding: ➤ Select the command value to be adjusted (1, 2, 3 or 4) by means of a call-up signal (command value call-ups 1 to 4). ➤ Use the associated potentiometer "w1“ .. "w4“ (or the connected external potentiometer) to set the desired command value. Check the setting at measuring socket “w“. ✔ Now, you can adjust the next command value.
Measuring sockets g sockets for the command value (w) and the actual current
value (I) are provided on the front panel. The following is valid: Com-
Adjust ramp times (internal/external)
Adjust jump height
Adjust maximum values
Before you can start with the adjustment word, the system-specific connections must have been made.
Plug jumpers
Plug jumpers “J1“ to “J10“ according to the application at hand so that the associated bridge is either open or closed. Information about the settings can be found in Fig. 6.1 on page 20 (for option T1) or in Fig. 6.2 on page 21 (for option T5).
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Fig. 6.2: Adjustment and indicator elements of amplifier card VT-VRPA2../T5
Masuring sockets
A measuring sockets for the command value (w) and the actual current value (I) is provided on the front panel. The following is valid: Command value measuring socket: ± 100 % = ± 10 V Actual value measuring socket: ± 100 % = ± 2.5 V