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Operating notes VLM60 User Manual
ASTECH GmbH page 7
Pin Signal Color
1 T+ Yellow
2 R+ White
3 T- Orange
4 R- Blue
Table 2: Configuration of connection 2
Pin Signal Color
1 V
Bus
Brown
2 D- White
3 GND Blue
4 D+ Black
5 n/c
Table 3: Configuration of connection 3
Figure 7: Pin arrangement of the connections, seen from device side
Voltage supply and grounding (Connection 1, Pin 7 and 8)
The electrical connection of the VLM60 may only be carried out by trained specialist personnel.
The VLM60 is supplied with 24 V
DC
. The power consumption is typically 5 W. If the device is equipped with a
fieldbus interface, the power consumption is typically 7 W. The permissible voltage range is 12 ... 30 V.
The shield of the 8-pin cable at connection 1 must be connected to the device ground on the device side. One
fixing hole each on the rear side of the device and on the right side of the device serves as grounding point.
Before the VLM60 is connected to the power supply, an electrically conductive connection must be established
between at least one grounding point and the device holder. The device holder must also be grounded with low
resistance!
A missing or insufficient grounding of the measuring device can lead to malfunctions or damage of
the electronics in case of overvoltage!
Connection 1 is a combined supply/signal connection. According to the applied EMC test standard it follows that
the DC power supply for the VLM60 must be designed locally. The device must not be connected to a DC
distribution network! It is the user's responsibility to establish the cabling accordingly.
Encoder interface (Connection 1, Pin 1 to 4)
The VLM600 provides a high-resolution 5V TTL pulse output with two phases A and B with 90° phase shift for
each direction of motion (X and Y). The usable frequency range is 0.2 Hz to 1 MHz. The resolution and the
maximum error are 8 ns. The output resistance is 20 Ohms. The maximum output current is ± 50 mA per phase
per channel. No external power supply is required. The outputs are equipped with a shutdown fuse in case of
thermal overload (e.g. due to too high current). Furthermore, the outputs are ESD protected. The pulse
sequences of both channels are independent of each other.
Figure 8 shows a typical pulse train for the case where velocity is detected in both the X and Y directions.