Power Supply - GE F650 Instruction Manual

3.2 POWER SUPPLY

3 HARDWARE
3.2POWER SUPPLY
F650 can incorporate a simple or redundant power supply.
The power supply module is fixed to the base plate using 4 screws, and the main and backup modules are identical.
These modules work in parallel continuously, distributing the 50% of the load for each of them, thus ensuring greater
reliability, and an instantaneous load transfer from the failed power supply to the other one, without loss of time or module
reset.
A relay connected to the low voltage side of the power supply monitors this voltage. The three contact terminals, normally
open, common, and normally closed, are available at the external connector terminals. This relay monitors only the power
supply integrity and it is not controlled by the main microprocessor. This way, if we want a relay to monitor whether the unit
is ready to protect (READY), we should program one of the auxiliary relays in the unit.
This is a "fly-back" type power supply, providing high efficiency, stability and reliability thanks to the maturity of this
technology. There are two available ranges, Hi and Low, in order to optimize efficiency and general performance, including
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the capability to tolerate auxiliary voltage interruptions (dips).
Oversized components highly resistant to temperature are used. For example, all capacitors are specified to stand up to
105ºC, transformer components are specially designed to stand up to 180ºC, the used MOSFET transistor is of very low
resistance, supports high voltage and is refrigerated by an oversized heat sink. This allows to support temperatures over
the 60ºC shown in the Technical Characteristics section, and prolonged overloads such as the ones occurring at batteries
in deep charge mode (much higher than +15% voltage shown in the Technical Characteristics section).
High capacitance capacitors are also used, providing high tolerance to prolonged dips, 100ms, even in the most
unfavorable consumption conditions. This allows the relay to continue with normal operation without undesired resets,
which would cause a long time of protection unavailability.
Figure 3–2: shows the location of communications modules over the CPU. These modules have been designed in
accordance with the "plug and play" philosophy, so that units can be easily updated after their purchase, allowing for a
simple and economical migration of the application.
Figure 3–2: COMMUNICATIONS MODULE
3-2 F650 Digital Bay Controller GEK-106310AB