Operating Instructions
Zero-3 / 5-Channel Motor Controller
CNC-STEP e.K. ▪ Siemensstrasse 13-15 ▪ 47608 Geldern ▪ Germany
Page 19
Support: +49 (0)2831/91021-50
12.10.2012
A second LPT port is provided for controlling a tool changer and frequency inverter (see the
illustration at the top right). The connector to the PC is male, the one for the tool changer/frequency
inverter is female.
The pin (LPT2) assignment is as follows:
Pin no.
description
Pin no.
description
1
Motor on/off (open
collector)
14
2
Looped through,
available
15
Looped through,
available
3
16
4
17
5
18
0..10V Speed target value
6
19
Signal ground
7
20
8
21
9
22
10
23
11
24
12
25
13
Pin no. 1 is an open-collector signal, i.e. it is switched to ground whenever the spindle motor is
switched on and can be used to control (start/stop input) a frequency inverter (max. 30V 50mA). Pin
no. 18 is the analog motor speed signal. It is short-circuit-proof so that no damage is caused if a
normal LPT cable (Pin 18=ground) is accidentally connected.
4 .3 . 6
External loads (power outlets)
Two 230V external loads can be connected to the two power outlets on the rear panel. The left-hand
power outlet, looking at it from the rear, is controlled by relay 1 and is normally used for the spindle
motor. The right-hand power outlet is controlled by relay 2 and can be optionally used for a vacuum
cleaner, a coolant pump or other sub-assemblies.
The maximum current consumption of each external load must not exceed
8A
. The total current
consumption must not exceed
13.5A
(16A minus the maximum current used by the machine itself).
Please note that the maximum current consumption can be higher than is to be expected from the
rated performance of the device. The maximum current consumption also taking account of start-up
and idling current is stated on the nameplate or in the manufacturer documentation. Exceeding the
maximum current leads to tripping of the fuses located in the interior of the housing.
