Excelsys ultimod, Руководство дизайнера, Страница: 4 / 15

Remote Voltage Programming using a Resistor.
The powerMod output voltage can be adjusted downward using
a remote potentiometer or reduced, using an external
resistance.
Calculation of the the external resistance depends on the actual
initial voltage setting of the powerMod (via the onboard
potentiometer). The preferred method is to set the powerMod
voltage to its maximum rating. e.g. XgK set to 30V. This will
allow the widest possible adjustment range of the output
voltage.
powerMod set to V
max
R
trim
= [3700V
out
- 250K] (2)
[2.5K-V
out
]
Example.
Using a powerMod XgK, determine the resistance value to be
applied to V
trim
pin in order to set powerMod output voltage to
20V.
K for XgK = 12.5
Vout = 20V
Using equation (2)
R
trim
= 6300 ohm
Alternatively if the powerMod voltage is set to new level via the
on-board potentiometer to another level e.g. 21V then the
following formula must be used to calculate the value of R
trim
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4
Installing powerMods
powerMods may be installed in empty slots by simply sliding in
the new powerMod , pushing the module ‘home’ until the
mounting bracket lines up with the hole in the Top Panel, then
securing the module with the M3 x 6 countersunk screw
provided. Power and interface connections can be made after
the powerMod has been installed.
powerMods may be paralleled for more power using bus bars
(Paralleling Links) across the positive and negative output
terminals. See Section 4.6 for details.
Section 4.6
powerMod Operation
The UltiMod has been designed to allow maximum flexibility in
meeting the unique requirements of individual users. The
inherent flexibility resulting from modularity concepts is further
enhanced by this flexibility. Although the products are very
versatile, care should always be taken to ensure that the proper
procedures are followed.
Voltage Adjustment
The UltiMod has been designed with maximum user flexibility as
a key objective. With regards to voltage adjustment this has been
achieved by the wide range of adjustment on each of the
powerMod models. Voltage adjustment may be achieved by:
1. Front-panel potentiometer adjustment (XgA - XgL)
2. Remote resistive programming (XgG - XgL)
3. Remote voltage programming (XgG - XgL)
See diagrams for details on external connections to the V trim
pin (J3 pin3) required for remote voltage programming(XgG -
XgL).
Remote Voltage Programming using a Voltage Source
Using an external Voltage source (Vcontrol), the powerMod
output voltage may be adjusted over a wide range. The
powerMod output voltage may be programmed by referring to
the Voltage Programming Graph and applying the formula
below to set the powerMod output voltage to the required level.
Voutput = K x Vcontrol (1)
The appropriate K factor for different powerMods are in the
‘Remote Output Voltage Adjustment’ table.
Important: Vcontrol must not exceed 2.5V .
Example.
Using a powerMod XgK, what external voltage must be applied
to Vtrim pin in order to set powerMod output voltage to 20V.
Voutput = 20V, K=12.5
Using equation (1); Voutput/K=Vcontrol
20V/12.5 = 1.6V.
Vcontrol = 1.6V
De
sig
ne
r M
an
ua
l
powerMod K
XgG 1.56
XgH 2.5
XgJ 6.23
XgK 12.5
XgL 24.2
Remote Output Voltage Adjustment of powerMods
Remote Output Voltage Adjustment of powerMods
Remote Output Voltage Adjustment Table
UltiMod Designer Manual