RUN 600 XTPRO: Service & Maintenance Manual - rev. 1.3
Page 3.8
The relationship between the speed reference and the inverter frequency is determined by the
programming of the inverter.
• Variable frequency VAC signal
This is the variable frequency alternating voltage generated by the inverter (pin U-V-W) for
supplying the motor. The motor speed increases with increasing frequency.
• Thermal cutout signal
Each motor phase is equipped with a normally-closed thermal cutout which opens when the
temperature exceeds a preset threshold. The 3 thermal cutouts are connected in series and exit
the motor via a 2-wire cable connected to the inverter (P24-3). The inverter is programmed to
expect a NC signal on these pins. When at least one thermal cutout is triggered, the contact
opens and the inverter, detecting the open-circuit condition, generates an alarm signal.
• Alarm signal
This is the signal generated by the inverter if a problem is detected in the motor drive, or if the
motor thermal cutouts open. It enters the inverter interface board (pins 3-4 of connector CN1)
and its value is 0 Vdc under normal conditions, 10 Vdc under alarm conditions.
The signal is then sent from the inverter interface board (pins 9-3 of connector CN2) to the CPU
board (pins 8-3 of connector CN1) and is 5 Vdc under normal conditions, 0 Vdc under alarm
conditions. When this alarm signal switches to 0 Vdc, the CPU disables the Start signal, resets
the PWM signal and shows the “CAUTION = E3” or “CAUTION = E4” error message on the
display.
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