RS V10745 Hoja De Instrucciones página 8

V10745
Motor current setting
The output current per phase is normally set using a four way DIP
switch as follows:
Switch setting
SW2-1 SW2-2
off off
off off
off off
off off
off on
off on
off on
on off
on off
on off
on off
on on
on on
on on
The above setting are approximate and may be influenced by the
motors resistance and inductance. The output current should ideally be
checked during commissioning, using an analogue meter.
The motor current may be reduced from the value set on the DIP switch
by connecting a resistor from the current program input to 0V. This may
be used to set the phase current by the connector the unit is plugged
into, or to reduce the motor current on application of an external signal
such as at standstill.
The external resistor should be selected to give the required voltage on
the current program input of approximately 0.47 x required current per
phase.
Thermal protection (user fit option)
A thermal sensor may be fitted to prevent overheating of the heatsink
and output devices. The sensor should be a switching type that opens
on excessive temperature such as AIRPAX type 67L080, that operates
at 80ºC. This device may be clipped onto the heatsink bracket and
soldered into the location SW3.
This feature will give a warning on the overtemperature output, that the
heatsink is too hot. This condition may be latched by setting switch
SW1-2 (LT) on. The drive may be automatically disabled on
overtemperature by setting switch SW1-1 on.
Status LED's (user fit option)
Provision has been made for the user to fit five status light emitting
diodes. These may be soldered into their locations at the front of the
board.
LED1 green
LED2 yellow
LED3 red
LED4 red
LED5 yellow
On board oscillator (user fit option)
A simple voltage controlled oscillator may be constructed on the drive
board by the addition of a few components. These parts are located at
the lower front of the board at the edge and may be soldered in without
removal of the heatsink. The output of this oscillator may be connected
directly to the step pulse input (pin 14c).
The external controls for the oscillator may be connected via the 32
way DIN41612 connector or alternatively, if front panel controls are
required, may be connected via a 5 pin MOLEX connector(P3).
8
Nominal output
SW2-3 SW2-4 current per phase
off off 0.0A
off on 0.5A
on off 0.9A
on on 1.2A
off off 1.3A
off on 1.85A
on on 2.1A
off off 2.3A
off on 2.5A
on off 2.7A
on on 3.0A
off on 3.1A
on off 3.3A
on on 3.5A
power is on
output is disabled
overtemperature fault detected
overload fault detected
home phase output
Oscillator operation
The normal method of oscillator operation is as follows:
1. The oscillator is started at the base speed by switching the run
switch on with the base/high speed switch set to base. This base
speed should be chosen to be safely within the pull-in capability of
the motor/drive combination, and ideally above the resonant
frequency range. This base speed is defined by C-freq and the
setting of VR1.
2. The high speed may be selected by switching the base/high speed
switch to high. The oscillator will then ramp up to the high speed.
This high speed is set by VR2, whose range is defined by R-freq and
C-freq. The ramp rate is determined by the time constant of R27
(100KΩ) and C-ramp.
3. The oscillator may then be slowed back down to the base speed by
switching the base/high speed back to base.
4. When the speed has dropped down to the base setting the oscillator
may be inhibited by switching the run switch off. The motor should
only be started, stopped or have a direction change whilst at the
base speed.
Component selection
The following components need to be soldered into the PCB:
IC8 CD4046 CMOS PLL IC (used as VCO)
R-freq resistor 1KΩ-1MΩ
C-freq capacitor >100pF (typ 10nF)
C-ramp capacitor (typ 10µF)
P3 optional molex connector if using front panel controls
The following external components are required to complete
the oscillator:
VR1 pot
VR2 pot
First determine the base speed and the maximum high speed
you wish to obtain.
Using the graph in Figure 14 select a value for C-freq for the chosen
pot VR1
Then from the ratio of the maximum running speed to the base speed,
use the graph in Figure 15 to select R-freq.
Caution
1. SERIOUS DAMAGE WILL OCCUR if any motor lead is connected or
becomes disconnected whilst the drive is energised.
2. The drive board should always be mounted such that the heatsink
fins are vertical i.e. with the board on edge, and adequate clearance
be given top and bottom i.e. 25 mm minimum. When rack mounting
the board there should be at least a 15 mm clearance between the
heatsink and an adjacent board. If the airflow around the unit is
restricted, then force air cooling should be employed.
3. When using the drive at high ambient temperatures or at slow
speeds or at standstill, whilst at high current settings, it will prove
advantageous to employ forced air cooling.
4. Motor and power supply connections should be made with at least
32/0.2 mm wire due to the high peak currents flowing. All other
control wiring may use 7/0,2 mm.
5. Good engineering practices should be employed in the
commissioning of this product and should be made to adhere to all
relevant regulations.
RS Components shall not be liable for any liability or loss of any nature (howsoever
caused and whether or not due to RS Components' negligence) which may result
from the use of any information provided in RS technical literature.
(typ 5.6KΩ)
0-1MΩ (typ 1MΩ)
1 KΩ