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17150 issue 17, October 2018
Vega DC Handbook
or
X1, X2, X4 or X8
where the number relates to the maximum voltage capability of the X module in accordance with
X1=10V, X2=20V, X4=40V, X8=80V. The X module is connected to the output terminals of D or E
modules, which may be connected in series or parallel. The X module contains diodes in series with
its output (for paralleling use) and additional circuitry for remote sense, paralleling with other X
modules and module inhibit. A maximum of two X modules may be fitted in a PSU.
or
B/S
where B/S indicates that a blanking plate is fitted in place of a module.
Any of the above modules (except the X modules) may have the module letter preceded with # or #/# where #
is represents the module output voltage.
Module Options:
N, P, R, T, L, K, D, V‡ or R‡
Where:
N = Inhibit, module good and remote sense
P = Parallel with current share
R = Remote sense (twin output modules only)
T = Remote sense (one output of twin output modules only)
L = Module good using LED indication
K = Allows for Vega products to be paralleled with Omega products
D = Secondary digital option (may only be fitted to single output modules). Provides analogue voltage and
resistive programming, current limit modes, inhibit output, enable output, turn on delay, module good, N+1
paralleling.
V‡ = Voltage programmable output voltage
R‡ = Resistance programmable output voltage
where ‡ represents a number between 1 and 99. Each number indicates an option variant
which does not affect safety, of these the following are standard variants:
1 = Inhibit, fixed current limit
2 = Inhibit, programmable current limit
3 = Enable, fixed current limit
4 = Enable, programmable current limit
SELV and Outputs Connected In Series:
Outputs are SELV except as described below:
Non-earthed outputs that have secondaries with 2 or more turns are non-SELV as a single fault in the
secondary may make them exceed the SELV limit between output and earth.
Non-earthed outputs that are connected in series are non-SELV unless all the seriesed outputs use 1 turn
secondaries and there are no more than 3 outputs connected in series.
Outputs connected in series are non-SELV if the total output v 20% of the max. rated output
voltage of the output with the highest rated voltage exceeds 60Vdc (the 20% addition allows for a single
fault in any one individual channel).
The total voltage of a seriesed output must not exceed 160V.
If any output or seriesed output is non-SELV then all the outputs in the PSU must be considered non-
SELV.
All outputs have operational spacings to earth, and due consideration must be given to this in the end
product design.
Note: Non-SELV outputs must be guarded or a deflector fitted during installation to avoid a service engineer
making inadvertent contact with the output terminals, or dropping a tool onto them.
