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MODEL SMC-L |
STEPPING MOTOR CONTROLLER
AND OPTICAL ISOLATED DRIVER
FEATURES:
COMPLETE MOTOR CONTROL AND DRIVE CAPABILITY IN A
#1 "CAMAC" MODULE
- DRIVERS ARE OPTICALLY ISOLATED AND INTERNALLY BIASED
- ADJUSTABLE LINEAR ACCELERATION AND DECELERATION TIME
The JOERGER ENTERPRISES INC. Model SMC-L is a self contained stepping
motor controller and optically isolated driver packaged in a single width CAMAC module.
It's features provide the ability to satisfy most stepping motor applications. The module
has adjustable linear acceleration and deceleration to provide an efficient method of
driving high torque loads at their maximum speed. The speed range is 50pps to 2000pps with
other ranges available if required. The four drivers are capable of switching up to 4 amps
per phase at 28 volts. To simplify installation the drivers are biased internally. This
means the only components required are the current limiting resistors, which must be
determined in each application to satisfy the current and voltage requirements of the
motor. The drivers feature low saturation voltage to limit the power dissipation inside
the module. Three external, high level logic inputs are used to test the status of the
external system, a clockwise limit, counterclockwise limit, and a signal that indicates
power is being applied to the motor. Logic is provided that will inhibit the driver if a
limit signal is received and the motor is requested to, or is stepping in that direction.
The number of steps is determined by a 16 bit command word that is in 2's compliment. Bit
16 determines direction and the remaining 15 bits contain the number of steps to be
performed. An interrupt structure is provided to improve system integration. A LAM F.F
will be set by either a CW or CCW limit or when the counter reaches zero, indicating the
end of a cycle.
The motor may also be clocked with external signals using the modules
drivers. CW and CCW inputs are provided that is decoded to the four phase code required by
the drivers and will drive the motor independently of the dataway. The motor may also be
driven manually by means of a front panel switch. This can also be very useful for setup
or for operation without the main system running. The manual mode speed is approximately
50pps. To provide the ability to drive motors that require more than 4 amps, two types of
output signals are provided that can be used by an external motor driver. CW and CCW pulse
trains are available and also a clock signal and direction bit. These signals contain the
acceleration time and speed information generated by the module. The CW, CCW signals can
also be used to monitor the module externally with an up-down counter. To truly monitor
the system, however, we recommend monitoring the motor itself and not the driver. Using a
synchro to digital converter or an incremental encoder attached to the motor itself
provides more dependable results. Please feel free to consult the factory for more
information about this type system.
OUTPUTS: (Logic outputs are TTL compatible,
Logic "1" = 0 volts)
| Motor Drivers |
Four phase, unipolar drive,
internally biased, capable of 4 amps at 28 volts, diode protected. |
| Internal Motor Power |
+24 volts from the dataway is
available at the motor. This is fused at 3 amps. |
| Frequency and Acceleration |
To monitor the frequency of the
output and the acceleration time, |
| Test Points |
Test points are available at the
front panel and in the connector. |
| CW Output, CCW Output |
To monitor both CW and CCW
Steps. Motor steps on trailing edge. Can also be used to drive an external high current
motor driver. |
| Direction Bit and Clock |
These two signals can be used to
drive external motor drivers that require sign/clock inputs. |
| Active |
To indicate when a cycle is in
progress. |
INPUTS:
| Clockwise Limit Counterclockwise
Limit External Power |
Logic "0" = 8v min.,
Logic "1" = 6v max. These signals must be in the logic "1" state for
operation, thus either a limit signal or a broken wire would indicate an abnormal
condition |
| CW Input, CCW Input |
The motor can be driven
externally in the CW or CCW direction by a TTL signal (logic "1" = 0 volts). The
motor steps on the trailing edge of the pulse. |
| Stop Input |
A logic "1" (0 volts)
will abort the cycle and reset the module. |
Manual
Control: |
A three position toggle switch
is provided to step the motor in the CW or CCW direction. An OFF position is provided to
disable this feature. The switch is gated with the CW and CCW limits so that the motor
cannot be driven when a limit condition exists. |
| Front Panel Adjustments: |
|
| Acceleration/Deceleration |
A multi-turn pot adjusts
acceleration and equal deceleration time from 20msec. to 2 sec. |
| Maximum Frequency |
A multi-turn pot adjusts maximum
frequency from 50pps to 2000pps. (Other frequencies can be provided, consult factory.) |
CAMAC COMMANDS:
| N.F0.A0 |
Reads count register onto read
lines R1-16. |
| N.F0.A1 |
Reads status register onto read
lines R1-5. |
| N.F1.A0 |
Reads out the control register
on read lines R1-15. |
| N.F1.A15 |
Reads module identity in BCD:
00.260.X |
| N.F8.A15 |
Tests LAM, Q=1 if LAM F.F. is
set and unit enabled. |
| N.F10.A15 |
Resets LAM F.F. |
| N.F16.A0.S1 |
Loads 2's compliment data into
count register from write lines W1-16. Strobe S2 initiates the cycle. Note, the limit and
bit "16" must not be in conflict or the cycle will not begin and A Q=0 will be
returned. Resets LAM F.F. |
| N.F17.A0 |
Loads the control register with
data from the write lines 1-16. W1-8 selects the speed with all zeros selecting the
minimum speed. W9-16 selects the acceleration/deceleration time with all zeros selecting
the longest acceleration time. |
| N.F24.A15 |
Disables L response. |
| N.F25.A0 |
Stops motor, aborts cycle,
resets unit. |
| N.F26.A15 |
Enables L response. |
| N.F27.A0 |
Tests module status to determine
if module is ready for another operation.
Q=1 if module is ready. |
| N.F27.A1 |
Tests contents of count
register, Q=1 if CTR=0. |
| X Response |
X=1 for all valid commands. |
| Q Response |
Q=1 for F0, F1, F16, F17 and in
response to F8 and F27. |
| L Response |
An interrupt is generated if the
LAM F.F. is set and the unit is enabled.
It is inhibited by N. |
| Z.S2, Power Up |
Resets the count register, the
LAM F.F., the control register and disables the LAM response. |
VISUAL INDICATORS:
|
N |
Module is addressed. |
|
Active |
Module is active. |
|
CW |
A clockwise limit exists. |
|
CCW |
A counterclockwise limit exists. |
|
EXT. PWR. |
External power is on. |
|
CTR = 0 |
The counter is at zero. |
| POWER REQUIREMENTS: |
+6v, 490ma; +24v, 27ma; -24v,
27ma. |
| SIZE: |
Model SMC-L #1 CAMAC module.
Connector, Cannon DD50P, mating half DD50S |
| TEMPERATURE RANGE: |
0° C
to 50° C |
JOERGER ENTERPRISES, INC 166 Laurel Road, East Northport, NY 11731
USA
| 1-631-757-6200 |
(Fax 1-631-757-6201) |
www.joergerinc.com |
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