An E-Stop is mandatory – MASSO will not run without one. This page covers the two ESTOP pins, wiring with and without the MPG pendant, the ES output, and troubleshooting.
ESTOP pin 1
With MASSO MPG pendant
ESTOP pin 2
Without pendant
ES output
≈2.3 V released, 0 V pressed
WARNING
The installer must wire the E-Stop so that pressing it disables all drives and actuators on the machine. Use the MASSO ES output and a relay to disable the axis drives and spindle drive circuits. Do not rely on software alone to stop motion in an emergency.
WARNING
Never connect inductive loads such as motor brakes or relay coils directly to the E-Stop circuit – this damages it. Drive them from the ES output through a MASSO relay module.
CAUTION
With a MASSO MPG pendant you must use ESTOP pin 1, or the pendant E-Stop button will not work. On MASSO G3 Touch, move the black wire from pin 2 to pin 1. On MASSO G3 with existing E-Stop buttons, move the E-Stop wire from pin 2 to pin 1.
1. Single E-Stop button
One E-Stop button connected to ESTOP pin 2. With this wiring the MPG pendant E-Stop button does not work. If you use the MASSO G3 Touch wiring module with external E-Stops at the machine, use only pin 2.
2. E-Stop buttons with the MPG pendant
Wire all E-Stop buttons in series from the positive supply to ESTOP pin 1. Pressing any E-Stop button, or the pendant E-Stop, triggers an E-Stop alarm on MASSO and sets the ES output Low. The diagram also shows how the pendant E-Stop relates to pins 1 and 2.
3. E-Stop output (ES) to a relay
The ES output is on the outputs terminal and follows the E-Stop circuit: about 2.3 V when the E-Stop is released and 0 V when pressed. A relay driven by ES is energised when released and drops out when pressed, which is fail-safe. The relay works independently of the MASSO software.
Use the ES relay to disable everything that must stop immediately: axis drives, spindle drives, lasers, plasma systems and any other equipment that needs instant shutdown.
More than two relays
Relays needed
How
Up to 2
ES drives the MASSO relay inputs directly
2 to 5 on one relay module
Use a 3.3 kΩ 1/4 W resistor as shown
More
ES drives relay 1; relay 1 switches the other relays
CAUTION
The device-disable methods in these diagrams are examples only. Always follow the device manufacturer's wiring instructions.
INFORMATION
Route the plasma On/Off signal through an E-Stop relay contact, so the arc cannot start during an E-Stop and shuts off immediately when the E-Stop is pressed.
WARNING
To cut mains power on E-Stop, do not switch mains through the MASSO relay module. Use it to switch a separate mains-rated relay, so low-voltage and mains circuits are not mixed on one board.
4. Troubleshooting
Use normally closed E-Stop switches, so a broken wire puts the machine into E-Stop. The E-Stop input should show High when released and Low when pressed.
Check
What to do
Input inverted
On the F1-Setup screen, make sure the E-Stop input is not inverted. If it is, select it and press Space.
Pendant fitted
Use pin 1, not pin 2. Unplugging the pendant triggers an E-Stop.
