Master Lock XR20 Manual de servicio descargar pdf (Pagina 56)

Caution: No plus or minus voltage should exceed 1000 Vdc with respect to

ground.

3.9.1 Series Operation - Direct

The simplest series connection involves attaching the positive terminal of the first supply to the

negative terminal of the second supply. The load is connected between the negative terminal of

the first supply and the positive terminal of the second supply. The output current controls of

each power supply are operative and the current limit is equal to the lowest control setting. If any

one output current control is set too low with respect to the total output current, the series power

supplies will automatically crossover to constant current operation and the output voltage will

drop.

3.9.2 Series Operation - Master/Slave

Master/slave series operation permits equal voltage sharing under all load conditions and allows

complete control of output voltage from one master power supply.

Figure 3.18 illustrates the terminal connection for master/slave series operation and salient control

circuitry. The control cable can be fabricated by the user or purchased as an option, UID46, from

the factory. These connections perform the following functions:

1. The voltage monitoring voltage, VO2, on the master power supply connects to the

external voltage set point input on the slave power supply. This makes the slave

power supply operate at the same voltage output as the master power supply

2. The power output digital control line of the master power supply connects to the

start digital control line of the slave power supply. This connection causes the

slave unit to turn on when the master unit is turned on.

3. The standby/alm digital control line of the master power supply connects to the

stop digital control line of the slave power supply. This connection causes the

slave unit to turn off when the master unit is turned off or when a diagnostic

condition appears.

4. Connections between terminals 4, 21, 22, and 23 set the current control to

maximum and set over voltage trip and over current trip to set points just beyond

full scale values. This forces the slave power supply to operate simply as a voltage

source whose voltage set point is established by the master unit.

The slave power supply must be configured for external program input. The master unit can

configured for rotary, external program, or remote input. Configuration commands are discussed

in Section 3.1.3.

To add a second slave unit, connect the output terminals of the second slave in series with the

other two power supplies. Furthermore, connect a second control cable between the second slave

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Master Lock XR20 Manual de servicio Pagina 56