GE Industrial Solutions CP2000AC54TE - Manual (Page 9)

GE
Data Sheet
CP2000AC54TE CPL High Efficiency Rectifier
100-120/200-277V
AC
input; Default Outputs: ±54V
DC
@ 2000W, 5V
DC
@ 4W
August 16, 2013 ©2013 General Electric Company. All rights reserved. Page 9
Control and Status
The Rectifier provides three means for monitor/control: analog,
PMBus™, or the GE Galaxy-based RS485 protocol.
Details of analog control and the PMBus™ based protocol are
provided in this data sheet. GE will provide separate
application notes on the Galaxy RS485 based protocol for
users to interface to the rectifier. Contact your local GE
representative for details.
Signal Reference
Unless otherwise noted, all signals are referenced to
Logic_GRD. See the Signal Definitions Table at the end of this
document for further description of all the signals.
Logic_GRD is isolated from the main output of the power
supply for PMBus communications. Communications and the
5V standby output are not connected to main power return
(Vout(-)) and can be tied to the system digital ground point
selected by the user. (Note that RS485 communications is
referenced to Vout(-), main power return of the power supply).
Logic_GRD is capacitively coupled to Frame_GRD inside the
power supply. The maximum voltage differential between
Logic_GRD and Frame_GRD should be less than 100V
DC
.
Control Signals
Enable: Controls the main 54V
DC
output when either analog
control or PMBus protocols are selected, as configured by the
Protocol pin. This pin must be pulled low to turn ON the
rectifier. The rectifier will turn OFF if either the Enable or the
ON/OFF pin is released. This signal is referenced to Logic_GRD.
In RS485 mode this pin is ignored.
ON/OFF: This is a shorter pin utilized for hot-plug applications
to ensure that the rectifier turns OFF before the power pins are
disengaged. It also ensures that the rectifier turns ON only
after the power pins have been engaged. Must be connected
to V_OUT ( - ) for the rectifier to be ON.
Margining: The 54V
DC
output can be adjusted between 44 –
58V
DC
by a control voltage on the Margin pin. This control
voltage can be generated either from an external voltage
source, or by forming a voltage divider between 3.3V and
Logic_GRD, as shown in Fig. 13. The power supply includes the
high side pull-up 10kΩ resistor to 3.3V
DC
. Connecting a resistor
between the margin pin and Logic_GRD will complete the
divider.
An open circuit, or a voltage level > 3.0V
DC
, on this pin sets the
main output to the factory default setting of 54V
DC
.
Hardware margining is only effective until software
commanded output voltage changes are not executed.
Software commanded output voltage settings permanently
override the hardware margin setting until power to the
internal controller is interrupted, for example if input power or
bias power is recycled.
The controller always restarts into its default configuration,
programmed to set the output as instructed by the margin pin.
Subsequent software commanded settings permanently
override the margin pin. Adding a resistor between margin and
Vout(-) is an ideal way of changing the factory set point of the
rectifier to whatever voltage level is desired by the user.
Figure 13. Diagram showing how output can be margined
using Vcontrol adjustment.
Module Present Signal: This signal has dual functionality. It
can be used to alert the system when a rectifier is inserted. A
500Ω resistor is present in series between this signal and
Logic_GRD. An external pull-up should not raise the voltage on
the pin above 0.25V
DC
. When the voltage on this pin exceeds
1V
DC
, the write_protect feature of the EEPROM is enabled.
8V_INT: Single wire connection between modules, Provides
bias to the DSP of an unpowered module.
Reset: This is a PCA9541 multiplexer function utilized during
PMBus communications. If momentarily grounded (Logic_GRD),
the multiplexer would reset itself.
Protocol: Establishes the communications mode of the
rectifier, between analog/PMBus and RS485 modes. For RS485,
connect a 10kΩ pull-down resistor from this pin to V_OUT( - ).
For analog/PMBus leave the pin open. Do not tie this signal pin
to V_OUT( - ) because that connection configures the internal
DSP into a reprogrammed state.
Unit Address: Each module has an internal 10kΩ resistor
pulled up between unit_address and 3.3V
DC
. A resistor
between unit_address and Vout(-) sets the appropriate unit
address.
Shelf Address: By applying the required voltage between the
shelf address pin and Vout(-), up to 8 different shelves and so
up to 32 different modules can be addressed using either the
PMBus or GE Galaxy based RS485 protocol.
PMBus addressing is limited to a maximum of 8 modules and
so the software decodes the shelf address setting into either
shelf 0 or shelf 1 in PMBus applications. If more than two
shelves are paralleled, the user must separate the I
2 C lines so
that address conflicts do not occur.
Shelf_address 1 2 3 4
Maximum voltage 3.45 2.97 2.56 2.14
Nominal voltage 3.30 2.86 2.4 1.96
Minimum voltage 3.00 2.60 2.18 1.73
Address bit- A2 0 1 0 1
Shelf_address 5 6 7 8
Maximum voltage 1.70 1.25 0.80 0.25
Nominal voltage 1.50 1.10 0.60 0.01
Minimum voltage 1.29 0.84 0.30 0
Address bit- A2 0 1 0 1
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