Electrotoad MK1 12V4A

The Electrotoad MK1 12V4A is a variable DC bench power supply with two output channels, capable of delivering approximately 50 Watts of DC power. Each channel is equipped with a pulse width modulation (PWM) module for accurate voltage control, as well as an analogue voltmeter and ammeter for easy monitoring of the output power.

•  Dual Output Channels: Independently controllable 1-12 Volt, ≤ 4 Amp outputs (shared)
• Overcurrent Detection and Reset Above 4 Volts: Provides protection for high-voltage scenarios
• Short Circuit Detection and Reset Above 4 Volts: Ensures safe operation under high-voltage conditions
• Easily Replaceable Parts: Simplified maintenance and repairs
• ABS Front Panel: Durable and user-friendly design
• Dual Cooling Fans: Efficient heat dissipation
• UK Design and Assembly: Quality assurance with local manufacturing and assembly
• Dedicated Support: Assistance available when needed

• Inductive Loads: Users must install flyback diode near load before use with inductive loads
• Short Circuit Protection: Not available below 4 Volts

  Short Circuit Limitations

• Above 4 Volts: The Switch-mode Power Supply (SMPS) will reset the unit within a couple of seconds if a short occurs. It is crucial to disconnect the short as soon as possible to prevent continuous resets, which could damage the PWM and/or analogue ammeter. Refer to the PWM and Analogue Ammeter replacement guide if needed.
• Below 4 Volts: Short circuit protection is inactive. This can result in a voltage drop and excessive current draw, potentially damaging the PWM and/or analogue ammeter if the short is not promptly disconnected. Allow a few seconds for components to cool before resuming work if no damage occurs.

Overcurrent Module

The Overcurrent Module is pre-set during assembly with the following settings (do not adjust):

• Current Limit: Between 4 and 5 Amps
• Time Before Disconnect: Approximately 1-2 seconds
• Time Before Reset: Approximately 2-5 seconds
• Overcurrent module is less effective at lower voltages

Status indicators are visible through the top vent:

• Green LED: Normal operation
• Red LED: Overcurrent detected

If the module fails to reset after multiple trips, power cycle the unit using the main switch on the AC input.

 · Ventilation: Ensure the unit is well-ventilated during operation to prevent overheating.

· Regular Inspection: Periodically check for any signs of wear or damage to the wires, connectors, and modules.

· Proper Handling: Handle the unit with care, especially during maintenance or replacement of parts.

· Not for use by or around those with pacemakers or other electrically controlled medical equipment.

· Use this unit within the specified parameters to avoid damage and other incidents.

· Competent users only.

• AC IEC Input Socket: Supplies power to the 12V 5 Amp SMPS.
• Distribution Board A: Distributes power to the cooling fans and the overcurrent module input.
• Overcurrent Module: Output is connected to Distribution Board B.
• Distribution Board B: Splits power between the inputs of the two PWM modules.
• PWM Modules: Outputs are connected to analogue voltmeters.
• Analogue Voltmeters: Negative terminals connected to negative outputs.
• Analogue Ammeters: Connected in series between the positive terminals of the voltmeters and the positive outputs.

All connections are made using 18-gauge silicone wire and crimp terminal connectors.

Note: For a more in-depth description of connections, please view our ‘Electrotoad MK1 Manufacturing Docs’ page.

 · Cooling Fans: Keep the cooling fans free from dust and debris to ensure efficient operation.

· Calibration: Regularly check and calibrate the voltmeters and ammeters to maintain accuracy.

· Component Replacement: Follow the replacement guide for PWM and analogue ammeters if they become damaged. Visit MK1 12V4A Maintenance page for more info.

· Contact us:If you are unsure of anything, or would like the unit to be serviced or fixed by us then feel free to contact us to make arrangements or receive additional help. Email – electrotoadhelp@gmail.com