Subject to change without notification
Subject to change without notification
6
2.2.1 Supply Voltages
2.2 Description
Explanation of ANALOG: This connection is internally connected to a potentiometer with
a 1 k
Ω
resistance. If this connection is not made, it can be used to measure the voltage at
the potentiometer, and it thus operates as an output. By means of a drive of sufficiently
low impedance, the user may set this voltage to the level that he requires;
in this mode, the connection operates as an input. The potentiometer on the board
should be set in the middle of the scale. See also the description in
2.2.3
.
The supply voltage V
cc
to the electronics section must be + 5V stabilized, and for the power
section it may be between V+ = + 5V DC and + 7,5V DC. The range of output voltage however
is always at max. 2,4V
eff
, independent of the supply voltage (see data sheet).
If a drive with very high power is used, it is advisable to use a supply voltage greater than 5V
for the supply section to minimize distortion of the output signal. Note that at the same time
the power loss in the power section will increase.
When connecting a micromotor 0206, output signal distortion occurs with an output voltage
of > 2200 mV
eff
and a voltage supply of 5V. If a 7V supply is used for the power section, these
distortions disappear.
The pins
Serial Receive
and
Serial Transmit
implement a serial link with TTL levels. To create an
RS232 interface, in order to link the micromotor control with a PC, a signal converter (MAX232
or similar) must be used to raise the levels to the corresp 12V and – 12V.
An RS422 link can be made to another drive, for example a MAX488. This gives the advantage
of greater immunity to disturbance.
Setup of the interfaces is described in Chapter
3.3.1
.
2.2.2 Serial Interface
The analog inputs are suitable for voltage levels between 0V and 5V.
Ramp Slope
: A voltage of 0V corresponds to a ramp of 0 revs/s
2
, and 5V corresponds to about
700 rpm/ms (= 11 700 1/s
2
). This input is shown in Fig. 5 connected via a 5 k
Ω
potentiometer.
If the pin is externally connected, the potentiometer should be set in the middle of its range,
in order to prevent an undesirable closed-circuit current.
Output Voltage 1
and
Output Voltage 2
: The voltage value of these two inputs is multiplied
internally and determines the level of the output voltage.
Output Voltage 1
is connected
internally to a potentiometer as a potential divider (see also Fig. 5). This is used to adjust the
maximum voltage that can be supplied to the micromotor without damaging it. Then via
Output Voltage 2
– e.g. using an external potentiometer – the output voltage can safely be
adjusted between 0V and the preset maximum value. If
Output Voltage 1
is also connected
externally, then the internal potentiometer should be set to its mid-range position, so as to
prevent a high closed-circuit current.
RPM 1
and
RPM 2
: Via these two inputs the speed can be adjusted over a wide range. The
measured voltages are multiplied internally to give the speed value. The response of these
inputs can be modified via the commands
mv, mav
and
maxav
.
2.2.3 Analog Inputs
