RTA BSD Series Manual

WARNING: It is user RESPONSIBILITY to check that this manual refers to product model and
version that will be used.

1. GENERAL CHARACTERISTICS

V
with stabilized supply (+/- 5%)
DC
V
with unstabilized supply (+/- 20%)
DC
I min
NP
I max
NP
Dimensions
Operating temperature
Table 1
Terms definition in Table 1
• V
Nominal value of DC voltage supply (range) at which the drive can operate.
DC
• I
Nominal phase current (peak value) which flows in each motor winding, measurable with motor turning at low
NP
speed (see Table 2). Automatic current reduction at motor standstill is 50% of value set.
• I
min and max Minimum and maximum value of nominal phase current setting using DIP-SWITCH.
NP
(*) NOTE: Never use any power supply voltage higher than allowed one.

2. LOGIC INPUT AND OUTPUT SIGNALS (AM3 Connector, see Fig. 1, 2, 3, 4 and chap. 7.2)

2- CURRENT OFF INPUT: When this signal is HIGH, the drive is active. When it is LOW, the drive is
inhibited, thus motor current (and so holding torque) is turned to zero.
3- STEP INPUT: Step is performed on HIGH to LOW transition of this signal. Suggested duty-cycle: 50%.
Max. frequency: 60 KHz with square wave signal supplied from a logic output at 5 volt. With duty cycle
different from 50%, STEP signal half period has to be longer than 8 µsec.
4- DIRECTION INPUT: With this signal HIGH motor rotation direction is opposite to the one obtained with
input LOW. This signal has to be valid at least 100 µs before STEP signal and has to stay in this state for
at least 100 µs after last step sent to the drive.
5- DRIVER FAULT OUTPUT: When drive is normally working, this output is SHORTED to GND; when drive
is in no-working state, the output is OPEN. The drive automatically goes in no-working state when some
protection is active and automatically recovers when the protection resets.
1 and 6- INTERNAL GND: The terminals are internally connected between each others and to terminals 10 (the
power supply common), 11 and 16. They can be used to connect the shield of logic signal cable (this is
mandatory or useful depending on type of control system).
SIMPLIFIED INPUT STRUCTURE
R1 = 10 KOHM
R2 = 3.3 KOHM
C = 220 pF
for STEP input
R1 = 22 KOHM
R2 = 6.8 KOHM
C = 2.2 nF
for DIRECTION input
R1 = 22 KOHM
R2 = 6.8 KOHM
INPUT
C = 47 nF
for CURRENT OFF
Vin
input
0
Vin nom = 5 Volt
Vin max = 24 Volt
Fig. 1 a
R.T.A. s.r.l. - Via E. Mattei – Fraz. Divisa 27020 Marcignago (PV) – Tel. +39.0382.929.855 - Fax +39.0382.929.150 – http://www.rta.it
BSD
SERIES STEPPING MOTOR DRIVES
(V)
(V)
(A)
(A)
(mm)
+V =5V
DC
UP
DW
R2
R1
DRIVE INTERNAL CIRCUIT
© R.T.A. s.r.l. BSD_ME03 – 11/18
BSD 02 BSD 02.V
from 22 to 50*
from 24 to 45
78 × 68 × 21 78 × 68 × 15
from + 5°C to + 45°C (see point 7.3)
SIMPLIFIED OUTPUT STRUCTURE
OUTPUT
(max 50 Volt - 10 mA)
GND
Vmax = 50 Volt
Imax = 10 mA
Vsat 0.8 Volt
Fig. 1 b
BSD 02.S
0.7
2.2
78 × 68 × 27
DRIVE INTERNAL CIRCUIT
1/5