COSMOS DRIVER SERIES 3000 - USE AND MAINTENANCE MANUAL
1.9.5
OFFSET [mA]
2
These parameters define the offset value which will
be added to the analogue output. Since the output
is only one, the two parameters depend on each
other; therefore, the setting of one parameter will
imply the modification of the other one. If you select
current output, modify OFFSET[mA]; if you select
voltage output, modify OFFSET[V].
The setting of an offset value different from zero is
very useful in case of negative value of the size unit
taken into consideration (IQ,VEL,ERR-VEL,ERR-POS).
Since the dynamics of the output signal is strictly
positive (4÷20 mA or 0÷10 V), the negative part of
the size unit would cause a null output.
The following parameters represent the proportionality constants between the analogue output voltage and the selected
reference value (Grif), according to the following formula:
where,
Vout = analogue output voltage;
Grif = reference value (IQ, VEL and ABS-VEL, ERR-VEL, ERR-POS);
[K-VOUT/
GRif ] = proportionality constant;
[OFFSET[V]] = offset value added to the analogue output.
The setting of these constants, as well as of the offset value, allows defining the analogue output dynamics and
consequently the full scale value:
1.9.6
K-VOUT/IQ
2
Proportionality constant of the IQ current, expressed
in A per V. It defines how many Ampere of the IQ
current correspond to
1 volt
of the output voltage
added to an offset value. This parameter is used
when the analogue output is set to provide the
reference of the IQ current.
1.9.7
K-VOUT/VEL
2
Proportionality constant of the motor speed,
expressed in rpm per Volt. It defines how many rpm
of the motor correspond to
1 volt
of the output
voltage added to an offset value. This parameter is
used when the analogue output is set to provide the
current speed reference of the motor (VEL and ABS-
VEL).
Ver. 1.07
Pag. 79
Vout
=
GRif
[
K
−
VOUT/
GRif
]
+[
OFFSET
[
V
]]
