-- 2 5 --cmha2de1
SOFT STARTING
S Remove and insulate wires 007 and 008 from rectifier bridge V01: see the cir cuit
diagram on page 7 and 8 f or LHN 130/140.
In the LHN 200, also remove and insulate wire 009 to rectifier bridge V02: see circuit
diagram on page 10.
S Connect an external power supply, having a current limit of 1 A, to the positive and
negative connections on V01.
S Adjust the power supply voltage to 30 V.
S Power the remaining parts of the unit from the normal power supply.
S Measure the output voltage from the machine. On the LHN 130/140 this must be 10 V
±1 V, and on the L HN 200 it must be 6 V ±1V.
S Measure the primary voltage to transformer TC02. With a voltage of 30 V across the
buffer capacitor, the waveform must appear as shown below.
cmha2p24
Primary voltage at TC02 for 30 V across the buffer capacitor
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