Alpha Technologies CXPS 48-1.8-i, 48V Pos Gnd - Manual (Page 38)

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7 Operation
7.1 Main Rectifier States
Rectifier operation can be broken up into five main states:
1. Off,
2. Start
delay,
3. Soft start,
4. Normal operation,
5. Turning off.
Each state is characterized as being distinct and necessary for the operation of the rectifier. These states are
briefly described below.
7.1.1 Off State
The rectifier will be in the Off state immediately after power is applied to the rectifier or after a rectifier shutdown.
The shutdown source may be remote or local shutdown, AC shutdown, OVP or thermal shutdown.
When the rectifier is in this state the DC-DC converter is turned off and the CXC will be monitoring its inputs for
the proper conditions to begin the start up sequence.
When the conditions have been met for the rectifier to start up, it will transition to the Start Delay state.
7.1.2 Start Delay State
When the rectifier is in the Start Delay state, the DC-DC converter is held off and still not sourcing power and is
waiting for a given amount of time before transitioning to the next state.
When in this state, the CXC continues to monitor its inputs.
After the Start Delay state the rectifier will transition to the Soft Start state.
NOTE: Soft start, or current walk-in, gradually increases the voltage and current output of the rectifier upon startup. This
is done to reduce the instantaneous load on the AC source.
7.1.3 Soft Start State
When the Soft Start state is entered, the rectifier will be turned on and the output voltage and output current will
be gradually increased. If a load is present, the rectifier will begin to source power.
When the voltage and current limit ramps have finished, the rectifier will transition to the Normal Operation state.
7.1.4 Normal Operation State
The Normal Operation state is the state that the rectifier will be in performing all of the rectifier functions and
features specified herein.
From this state, the only valid transition is to the Turning Off state. This transition will happen if the rectifier is
required to shut down.
7.1.5 Turning Off State
The Turning Off state is entered because a short delay is required before the rectifier actually turns off to take
care of any initialization requirements.
When this short delay has elapsed, a transition to the Off state is made.
7.2 Main Rectifier Modes
In addition to Main Rectifier States, there is a set of Main Rectifier Modes. These modes can be divided into two
categories as follows: