11
MCTC manual
System Configuration: Input type
Type of input signal used for synchronizing the dosage: relay, timer or tacho.
In VOLU prod. Mode. Timer is used automatically.
For INJ in timer mode the start pulse should be min. 0,2 seconds.
For INJ in relay mode the start signal should be as long as the dosing time.
If INJ - Relay is selected the dosing system will follow the machine relay time.
The controller will filter out small changes so that the regulation is not being influenced.
Big changes will be followed, the production screen shows the real machine relay time.
Input (start) signal
The MCTC needs an input signal from the production machine in order to operate.
Three different input signals can be used to control the MCTC. Please also have a look at chapter Electrical
Connections.
WARNING: make sure the input signals of different units are not connected to each other. This might cause damage to the controller.
1.
A potential free relay contact.
Use the white and brown wire of the input cable for the potential free contact.
2.
A potential contact (24 Volt DC*).
In case of a powered relay signal (wet contact) connect the white wire to +24 VDC and the yellow wire to
the 0 VDC.
* Note potential contact
Guaranteed OFF:
0-8VDC
Guaranteed ON:
18-30VDC
3.
A tacho signal up to 30 Volt DC.
This is used when the dosing system needs to be connected to an extruder that has a tacho generator
that produces a voltage linear to the extruder speed. When using a tacho generator signal, make a
connection between the white and brown wire. It will function as a start signal. Connect green to + VDC
and yellow to the - side of the generator.
The maximum voltage that can be applied to the MCTC is 30 VDC. The tacho voltage has to be reduced to 30
VDC if the tacho generator has a higher voltage output than 30 VDC at the maximum extruder output
capacity. See the diagram below.
Rx (
kilo-Ohm
) = (2,684 x (Max. tacho output VDC
–
5))
–
66
If the extruder stops when connected to the metering unit, an isolated signal converter is needed. Contact
your agent or Movacolor for more information.
EXT
INJ
BATCH
timer
X
X
relay
X
X
X
X
tacho
X
X
GRAVI
VOLU GRAVI
VOLU
Input
connection
Resistor (
Rx
) kOhm
Green wire +
Tacho
generator
EXTRUDER
Yellow wire -
8
7