USER MANUAL
RCB/MCB600 SERIES
www.enedopower.com 10/30 UM_RCB1200 Series_Rev01, Aug 2020
+5V bias supply (Power Unit)
Each of the sections of the entire unit, provides a +5 V bias supply that can deliver up to 200 mA. These two supplies are available whenever the AC
mains voltage is connected and their correspondent input stages are operating correctly.
To ensure safety, the following abnormal conditions may cause one or both power supply’s sections to latch off, which will disable their +5V bias
supply:
Over temperature of any stage of the section
Over voltage on the correspondent output
Internal over current (device failure)
AC mains signal _ ACOK (Output)
An ACOK signal is provided by each section to indicate to the user that the AC mains voltage is applied and the correspondent input stage is
operating correctly. This output signal is driven from an internal operational amplifier as shown in the following diagram. Under normal operating
conditions this signal gives a warning of 5 ms before the correspondent section output voltage falls below the power good threshold. However, to
ensure safety, the following abnormal conditions may cause one or both power supply’s sections to latch off without an ACOK warning:
Over temperature of any stage of the section
Over voltage on the correspondent output
Internal over current (device failure)
Power Good signals _ PG1-PG4 (Output)
Each output module provides a power good (PG) signal to indicate when the output voltage is above approximately 90% of the pre-set voltage for
that module. Each PG signal on an output module is internally connected through an opto-isolator to the correspondent signals circuit, which
buffers the signal through a PNP transistor with a 10 kΩ pull down resistor, as shown here below.
The LED on the front of each module gives a visual confirmation of the PG status.
Note that remote adjustments of the output voltage using the VCONTROL and ICONTROL pins do not change the PG signal threshold. The PG threshold is
always approximately 90% of the voltage set with the manual potentiometer.
Output Inhibits _ INH1-INH4, GINH (Input)
The signals circuit of each section, provides four inhibit inputs to disable each of its output module individually and a fifth global inhibit input
(GINH) to inhibit all modules of the correspondent section simultaneously. Each inhibit input is internally connected through an opto-isolator to
the respective output modules. The basic internal electrical circuit and timing diagrams are shown below. Typically, tOFF = 100 μs and tON = 8 ms.
Relatively to each section of the RCB1200 power unit, to inhibit each output module individually, its GINH should be connected to the respective
COM, and +5 V applied to the appropriate input INH1/2/…/8. To start with all outputs in a section inhibited and then enable them individually, the
correspondent GINH should be connected to +5 V, then pull down the appropriate input INH1/2/…/8. If a GINH in a section is left unconnected,
then the correspondent inhibit signals will all behave as global inhibit inputs for that section. I.e. +5 V on any INH input will disable all outputs.
