BEHLMAN BL20000 Series, User'S Manual And Technical Reference Manual

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BL20K SERIES REV E 2013
4.2.2 CONTROLLER CARD POTENTIOMETER ADJUSTMENTS
Since certain potentiometer adjustments affect other associated potentiometer settings, a sequence of
adjustments must be followed to ensure the proper setting of each potentiometer within the three groups
comprising the unit. The three groups: frequency, voltage, and current, are listed below in the sequence to be
performed within each group. Note that each phase control card (106-944-00X) contains three adjustments. One
for overall Gain ( R29) , one to calibrate the voltage display ( R61) and one to calibrate the current display ( R58).
The frequency is determined by the motherboard adjustments. There are no individual frequency adjustment as
all phases control boards receive the same clock signal.
FREQUENCY VOLTAGE CURRENT
POT. PARA POT. PARA POT. PARA
R15 4.2.3 R29 4.2.6 R58 4.2.9
R16 4.2.4 R61 4.2.7
R19 4.2.5
4.2.3 LOW FREQUENCY TRIM (45 Hz R15)
1) Connect frequency counter to rear panel N A and NEUT terminal strip.
2) Turn the FREQ control fully ccw.
3) Set the power circuit breaker to ON.
4) Set the OUTPUT switch to ON
5) Set the selector switch to N A.
6) Adjust the VOLTS control clockwise until volts meter indicates 10 Vrms minimum.
7) Adjust the 45 Hz potentiometer R15 until the frequency counter indicates 45 Hz.
4.2.4 HIGH END FREQUENCY TRIM (500 Hz R16)
1) Turn the FREQ control fully cw.
2) Adjust the 500 Hz potentiometer R16 until the frequency counter indicates 500 Hz.
4.2.5 FREQUENCY METER ADJUST Hz-METER (R19)
1 ) Turn the FREQ control fully ccw.
2) Adjust Hz-METER potentiometer R19 until the DUT frequency meter indicates 500 Hz.
4.2.6 FULL SCALE OUTPUT VOLTAGE ADJUST (R29)
1) Using a DVM set to ac volts, connect it across rear panel N A and NEUT on output terminal strip.
2) Turn the VOLTS control fully clockwise.
3) Set the circuit breaker of power chassis to ON .
4) Set the OUTPUT switch of the control chassis to ON .
5) Adjust R29 until the external DVM indicates 135 VMS..