TOMATECH AUTOMATION
nCP–
nDIR
nCP
Chapter 2 Definition and Connection of Interface Signal
311
Ⅲ Connection
Type 1: Type 2:
Fig. 2-4 Signal types by drive unit
2.1.4 Axis enable signal nEN
nEN signal output is active as CNC works normally (nEN signal to 0V on); when the drive
unit
alarm or emergency alarm occurs, CNC cuts off nEN signal output (nEN signal to 0V off).
The interior
interface circuit is shown in Fig. 2-5:
Fig. 2-5 Interior interface circuit for axis enable signal
2.1.5 Pulse disable signal nSET
nSET signal is used to control servo input disable which can enhance the anti-disturbance
capability between CNC and drive unit. This signal is at low level if there is pulse output
from CNC,
high resistance if not. The interior interface circuit of it is shown in Fig. 2-6:
Fig. 2-6 Pulse disable signal circuit
2.1.6 Zero signal nPC
During machine zero return, the one-turn or proximity switch signal from the motor
encoder is
taken as zero signal. Its interior circuit is shown in Fig.2-7.
Fig. 2-7 Zero signal circuit
Note: nPC signal uses +24V level.
a) The wave of PC signal by user is shown in Fig. 2-8:
EN
ULN2803
nEN
SET
ULN2803
nSET
+5V
PC
nPC
312
Ⅲ Connection
Fig. 2-8 PC signal wave
Note: During the machine zero return, the CNC detects the jumping of the PC signal to judge the
reference
point after the DEC switch is detached, which is active in both rise edge and trailing edge of the
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