JOG EXCITE: Service & Maintenance Manual - rev. 1.1
Page 3.7
In such a case the AT driver halts the motor and outputs an alarm signal to the display board which
displays the “THE EQUIPMENT IS BLOCKED” message.
3.2.3. THE SIGNALS INVOLVED
The machine uses the following control signals:
• RS-485 Signal
This is a digital signal exchanged between the AT driver and the display board.
• Variable frequency VAC signal
This is the variable alternating-voltage signal output by the AT driver (pins 1-2-3 connector J5)
to supply the motor. Increasing the frequency of this signal increases the motor speed.
• Thermal cut-out 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 AT driver (pins 4-5 of connector J5).
When this input signal is an open contact, the AT driver detects the alarm, halts the motor and
sends an alarm signal over the RS-485 line to the display board.
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