Local Operation
3-23
2. The first cycle of SLAVE waveform will be distorted if the DEG ON
(output on degree, see 3.7.2) doesn’t be set correctly. For
example, if the MASTER DEG
ON = 90, the DEG ON of SLAVE
must be 210 (120 + 90 = 210). Another SLAVE must DEG ON =
330 (240 + 90 = 330).
1. If the DEG OFF (quit degree, see 3.7.2) of MASTER and SLAVE
are IMMED, the MASTER phase angle will qu
it on zero degree, and
the SLAVE will quit on 120 or 240 degree. But if users assign quit
degree, for example, if the MASTER DEG OFF = 90, the DEG OFF
of SLAVE must be 210 (120 + 90 = 210). Another SLAVE must
DEG OFF = 330 (240 + 90 = 330).
2. The voltage setting of 3-phase output is line-to-neutral V
LN for each
phase. If users need the line-to-line voltage V
LL, the VLN must equal
to V
LL / 1.732.
The user can use two units of 61500 AC source to connect in series to
get higher voltage by three-phase mode. The phase degree should be
set on 180 degree. And the user also needs to set the right DEG ON and
OFF to get right phase when output is ON or OFF.
WARNING
1. Only one AC source can be set to MASTER, or it may cause
damage when run 3-PHASE MODE.
2. Users can not connect L terminals of AC source outputs together,
even set the DEGREE = 0 of SLAVE.
3. For safety concern, the 3-phase mode can’t save to power-on
status.
3.7.7 PARALLEL MODE
When the power of one AC source is not enough to drive load, it's allowed to parallel AC
sources if they are the same model. Users can set PARALLEL MODE on OUTPUT
functional list (see 3.7). The AC source setting as MASTER sends SCLK and PWM signals
to SLAVE o
ne. Users program output only in MASTER, and read the measurement
individually.
The procedures of paralleling AC source:
1. Set the power switch of MASTER and SLAVE on the rear panel to “DISABLE”. Assemble
an additional power switch to control the power line input of MASTER and SLAVE.
2. Quit the output of AC sources, set Vout = 0V. Set all to the same RANGE and status of
OUTPUT RELAY.
3. Connect SCLK signal (in rear panel, BNC connector) together. Connect PWM signal
together, too. Connect the same cable used in 3.7.5 Three Phase Mode.
4.
Connect the terminals of AC source outputs (N to N, L to L), then, connect to the load.
5. Set the AC source as MASTER first, set the SLAVE last. After setting, press
PAGE/EXIT twice to MAIN PAGE.
6. The other settings of AC source cannot be changed when it is in parallel mode.
7. The MASTER can program and run or quit the output; the SLAVE only measures the
output of itself.
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