Executive Overview
In automated factory production lines, automated test equipment (ATE), and smart energy management cabinets, operators cannot manually turn a trimmer potentiometer each time a test cycle changes. External analog control (commonly 0–5V DC or 0–10V DC) allows a centralized programmable logic controller (PLC), industrial PC (IPC), or DAC module to program the power supply output voltage and current ceilings remotely and continuously.
Linear Transfer Function & Scaling
The internal control loop of an analog-controlled SMPS maps an external control voltage (V_ctrl) proportionally across 0% to 100% of the maximum rated output voltage (V_max).
For a 0–10V controlled 220V DC power supply, applying 0V DC sets the output to 0V; applying 5V DC sets the output to 110V; applying 10V DC sets the output to the maximum rated 220V DC. The same linear relationship governs current limiting pins (I_ctrl).
Four Versatile Operating Modes
MZMW SCN and SCE series power supplies provide multi-mode flexibility to accommodate both automated production lines and standalone manual workstations:
- ●0–5V Analog Signal Mode: Interfaces directly with 5V microcontroller DAC outputs and low-voltage PLC cards.
- ●0–10V Analog Signal Mode: Industry standard for building automation, SCADA systems, and standard industrial PLCs.
- ●Front-Panel Potentiometers: Precision multi-turn V.ADJ and A.ADJ potentiometers for manual field calibration.
- ●Direct Uncontrolled Mode: Leave control pins open to operate as a high-reliability fixed DC power supply.
Wiring and Noise Immunity Guidelines
Because 0–10V control signals are low-voltage analog references, electrical noise emitted by neighboring inverters or motor contactors can cause output jitter. Always use twisted-pair shielded cables for control wiring and ground the shield at the power supply side only (single-point grounding).
- ✓Allows automated remote voltage ramping and dynamic current limits via PLC analog outputs.
- ✓Eliminates manual trimmer adjustment in automated production lines and test benches.
- ✓Supports dual-mode analog signal scaling (0–5V or 0–10V) with high input impedance (>10kΩ).