CONTREX ML-TRIM User Manual
ML–Trim
User Manual
0001-0127
Revision C
i
T echnical Assistance
If you have comments or questions concerning the operation of the ML–Trim, please
call us. A member of our Technical Support Staff will be happy to assist you. Ask for
Technical Support: (763) 424-7800 or 1-800-342-4411
Copyright © 1998 Contrex
ii
Contrex
®
8900 Zachary Lane North
Maple Grove, Minnesota 55369
DANGER
Improper installation can
cause severe injury, death or
damage to your system.
Integrate this motion control
unit into your system with
caution.
Operate this motion control unit only under
the conditions prescribed in this manual.
Any other use shall be deemed
inappropriate.
Comply with the National Electrical Code
and all applicable local and national codes.
iii
iv
Table of Contents
Introduction ...................................................................... 1-1
Introducing the ML–Trim................................................................................ 1-3
Examples of ML–Trim Applications............................................................... 1-4
Installation / Setup ......................................................... 2-1
Mounting ........................................................................................................ 2-3
Wiring............................................................................................................ 2-5
Inputs.................................................................................................... 2-7
Outputs............................................................................................... 2-13
Serial Communications ...................................................................... 2-15
Calibration.................................................................................................... 2-17
Motor Drive Set Up............................................................................. 2-18
ML–Trim Calibration........................................................................... 2-19
Operation.......................................................................... 3-1
Keypad Operation.......................................................................................... 3-3
Keypad Lockout ............................................................................................. 3-5
Control Parameters........................................................................................ 3-7
Direct Mode.......................................................................................... 3-8
Master Mode ........................................................................................ 3-9
Follower Mode.................................................................................... 3-13
Inverse Master Mode ......................................................................... 3-22
Inverse Follower Mode....................................................................... 3-24
Acceleration/Deceleration .................................................................. 3-26
Tuning ................................................................................................. 3-27
Alarms ................................................................................................ 3-29
Jog...................................................................................................... 3-31
Logic Control................................................................................................ 3-33
Logic Inputs........................................................................................ 3-34
Logic Output....................................................................................... 3-37
Monitor Parameters ..................................................................................... 3-39
Input Monitoring ................................................................................. 3-40
Output Monitoring............................................................................... 3-42
v
Performance Monitoring..................................................................... 3-43
Status Monitoring ............................................................................... 3-45
Serial Communications................................................................................ 3-49
Using Serial Communications............................................................ 3-50
Communications Software Design..................................................... 3-52
Troubleshooting.............................................................. 4-1
Diagnostics .................................................................................................... 4-3
Troubleshooting ........................................................................................... 4-11
PROM chip Replacement ............................................................................ 4-16
Glossary..............................................................Glossary-1
Glossary.............................................................................................Glossary-3
Appendices ......................................................................A-1
Appendix A: ML–Trim Specifications ............................................................ A-1
Appendix B: Formulas ..................................................................................B-1
Appendix C: Parameter Summary - numeric quick reference......................C-1
Appendix D: Control Parameter Reference..................................................D-1
Appendix E: Monitor Parameter Reference..................................................E-1
Appendix F: ML–Trim Fax Cover Sheet ....................................................... F-1
Appendix G: Wiring Diagram Examples ...................................................... G-1
Appendix H: Revision Log ............................................................................H-1
Warranty ..............................................................Warranty-1
Service Policy ....................................................................................Warranty-3
Warranty.............................................................................................Warranty-4
Index .......................................................................... Index-1
Index ....................................................................................................... Index-3
vi
List of Illustrations
Figure 1-1 ML–Trim Master Mode ............................................................. 1-4
Figure 1-2 ML–Trim Follower Mode ........................................................... 1-5
Figure 2-1 ML–Trim Cutout Dimensions and Mounting Guide .................. 2-2
Figure 2-2 ML–Trim General Wiring Guide ............................................... 2-4
Figure 2-3 I/O Power (Isolated).................................................................. 2-7
Figure 2-4 I/O Power (Non-Isolated) .......................................................... 2-7
Figure 2-5 AC Power.................................................................................. 2-8
Figure 2-6 Lead Frequency ....................................................................... 2-8
Figure 2-7 Feedback Frequency ............................................................... 2-9
Figure 2-8 Run ........................................................................................... 2-9
Figure 2-9 Jog .......................................................................................... 2-10
Figure 2-10 R–Stop .................................................................................... 2-10
Figure 2-11 F–Stop .................................................................................... 2-11
Figure 2-12 Master or Follower .................................................................. 2-11
Figure 2-13 Setpoint Select........................................................................ 2-12
Figure 2-14 Speed Command Out ............................................................. 2-13
Figure 2-15 Drive Enable and Alarms Outputs .......................................... 2-14
Figure 2-16 ML–Trim Multidrop Installation................................................ 2-15
Figure 2-17 ML–Trim Serial Communications Connections .................... 2-16
Figure 3-1 ML–Trim Front Panel ............................................................... 3-4
Figure 3-2 ML–Trim Internal Structure .................................................... 3-43
Figure 4-1 Motor Does Not Stop Flowchart ............................................ 4-12
Figure 4-2 Motor Does Not Run Flowchart ............................................. 4-13
Figure 4-3 Motor Runs at Wrong Speed Flowchart ................................ 4-14
Figure 4-4 Motor Runs Unstable Flowchart ............................................ 4-15
Figure 4-5 PROM Location ...................................................................... 4-17
Figure G-1 ML–Trim Wiring Connections without Relays ........................ G-1
Figure G-2 Relay Start/Stop Wiring Connections .................................... G-2
Figure G-3 Start/Stop for Regen with Armature Contactor ...................... G-3
Figure G-4 Start/Stop for Non-Regen with Armature Contactor .............. G-4
Figure G-5 Two Channel Start/Stop - Lead/Follower Logic ..................... G-5
vii
List of Tables
Table 3-1 Basic Keypad Entry ................................................................. 3-4
Table 3-2 Default Direct Mode Control Parameters ................................. 3-8
Table 3-3 Entering Direct Mode Control Parameters ............................... 3-8
Table 3-4 Default Master Scaling Control Parameters .......................... 3-10
Table 3-5 Entering Master Scaling Control Parameters ........................ 3-10
Table 3-6 Entering Master Setpoint Control Parameters ....................... 3-11
Table 3-7 Master Mode Control Parameters Example .......................... 3-12
Table 3-8 Default Follower Scaling Control Parameters ....................... 3-14
Table 3-9 Entering Follower Scaling Control Parameters ..................... 3-14
Table 3-10 Entering Follower Setpoint Control Parameters .................... 3-15
Table 3-11 Follower Mode Control Parameters Example A .................... 3-18
Table 3-12 Follower Mode Control Parameters Example B .................... 3-21
Table 3-13 Default Inverse Master Control Parameters........................... 3-22
Table 3-14 Entering Inverse Master Control Parameters......................... 3-22
Table 3-15 Inverse Master Mode Control Parameters Example .............. 3-23
Table 3-16 Default Inverse Follower Control Parameters ........................ 3-24
Table 3-17 Entering Inverse Follower Control Parameters ...................... 3-24
Table 3-18 Inverse Follower Mode Control Parameters Example............ 3-25
Table 3-19 Default Master or Follower Accel/Decel Control Parameters 3-26
Table 3-20 Entering Master or Follower Accel/Decel Control Parameters 3-26
Table 3-21 Default Master or Follower Tuning Control Parameters ........ 3-27
Table 3-22 Entering Master or Follower Tuning Control Parameters ...... 3-28
Table 3-23 Default Alarm Control Parameters ......................................... 3-29
Table 3-24 Entering Alarm Control Parameters ....................................... 3-30
Table 3-25 Default Jog Control Parameters ............................................ 3-31
Table 3-26 Entering Jog Control Parameters .......................................... 3-31
Table 3-27 Default Drive Enable Logic Control Parameters ....................3-37
Table 3-28 Entering Drive Enable Logic Control Parameters .................. 3-37
Table 3-29 Parameter Send - Host Transmission.....................................3-53
Table 3-30 Parameter Send - ML–Trim Response .................................. 3-56
Table 3-31 Control Command Send - Host Transmission ....................... 3-58
Table 3-32 Control Command Send - ML–Trim Response ...................... 3-60
Table 3-33 Data Inquiry - Host Transmission ........................................... 3-62
Table 3-34 Data Inquiry - ML–Trim Response ......................................... 3-64
Table 3-35 ASCII to Binary ...................................................................... 3-66
Table 3-36 Binary to Monitor Parameters ................................................ 3-67
viii
Introduction
Introducing the ML–Trim
Examples of ML–Trim Applications
1 - 1
1 - 2
INTRODUCING THE ML–TRIM
The ML–Trim is a highly accurate, digital, motor controller. It has advanced embedded
software that is capable of solving a great variety of speed control tasks. It operates as
either a stand-alone control of a single motor (Master mode) or as a part of a complex
multi-drive system (Follower mode).
The ML–Trim is ideal for motor control applications where your present open loop or
rudimentary closed loop operations are inaccurate or where there is inadequate load
regulation. The ML–Trim adds accurate digital control to virtually any AC, DC, Servo,
Flux Vector or Clutch drives. The ML–Trim is also at the forefront in digitally accurate
Follower applications. See Figure 1-1 and Figure 1-2 for examples of Master and
Follower applications.
The ML–Trim is unique among its competition because the ML–Trim has preprogramed
software that integrates with your system with little effort from you. The ML–Trim will
also allow you to enter data that is unique to your system's specific needs (e.g.,
maximum RPMs, setpoints, acceleration/deceleration ramp rates). Using Control
Parameters (CPs), this data is entered through either the ML–Trim's integrated keypad
or though a host computer via the RS485 Serial Communications port. In addition to
the Control Parameters that allow you to customize for your systems specific needs, the
ML–Trim's Monitor Parameters (MPs) allow you to monitor your system's performance.
The ML–Trim's multiple scaling formats allow you to enter the setpoints and monitor
speed in the Engineering Units (e.g., RPMs, gallons per hour, feet per minute) that are
unique to your system. Among the ML–Trim's advanced capabilities is the flexibility to
preset up to four setpoint entries.
Integrating the ML–Trim's applied intelligence with your system puts precise speeds
and perfect synchronization at your fingertips, quickly, easily and cost effectively.
1 - 3
EXAMPLES OF ML–TRIM
APPLICATIONS
Figure 1-1 is an example of a Master mode of operation for a pump application. The
scaling format allows the operator to enter a setpoint in Engineering Units of gallons per
minute. The ML–Trim compares the sensor shaft feedback to the scaled setpoint and
calculates any speed error. When the ML–Trim finds speed error, the control algorithm
adjusts the Speed Command Out to the motor drive and reduces the error to zero.
Speed
Command
Out
ontrex
C
Motor Drive ML–Trim
Contrex
CODE
SELECT
POINT
TACH
SET
89
7
456
23
1
0
–
ENTER
CLEAR
.
1 - 4
Motor
Sensor
Pump
Feedback Frequency
Figure 1-1 ML–Trim Master Mode
Figure 1-2 is an example of the Follower mode of operation in a pump application. The
scaling format allows the operator to enter the setpoint as a ratio of ingredient B to
ingredient A. The ML–Trim compares the setpoint ratio to the Follower sensor shaft
feedback and Lead sensor shaft feedback to calculate any speed error. When the
ML–Trim finds speed error, the control algorithm adjusts the Speed Command Out to
the motor drive and reduces the error to zero.
Lead
Speed
Lead Motor
Command
Out
ontrex
C
Motor Drive ML–Trim
Sensor
Pump
Contrex
8 9
7
CODE
SELECT
4 5 6
SET
POINT
2 3
1
TACH
.
0
–
ENTER
CLEAR
Feedback Frequency
Ingredient A
Final Product
Follower
Follower Motor
Lead Frequency
Contrex
8 9
7
CODE
SELECT
4 5 6
SET
POINT
2 3
1
TACH
.
0
–
ENTER
CLEAR
C
ontrex
Speed
Command
Out
Motor Drive ML–Trim
Feedback Frequency
Sensor
Pump
Ingredient B
Figure 1-2 ML–Trim Follower Mode
1 - 5
—NOTES—
1 - 6
Installation / Setup
Mounting
Wiring
Inputs
Outputs
Serial Communications
Calibration
Motor Drive Setup
ML–Trim Calibration
2 - 1
Contrex
,
,
CUTOUT
(
3.65" .03"
6.00"
(
DOOR PANEL
Contrex
8 9
7
CODE
SELECT
4 5 6
SET
POINT
TACH
1
–
CLEAR
2 3
0
ENTER
.
)
3.60"
CUTOUT
(
3.65" .03"
3.60"
*
4.00"
*
From the rear of the door panel to the back of the connectors
4.00"
2 - 2
Figure 2-1 ML–Trim Cutout Dimensions and Mounting Guide
MOUNTING
This section contains instructions for mounting the ML–Trim in the door panel of a
NEMA Industrial Electrical enclosure. The ML–Trim is packaged in a compact 1/4 DIN
Vertical Instrument Enclosure that mounts easily in the door of your Industrial Electrical
Enclosure. The Electrical Enclosure must have an IP54 rating or higher to comply with
CE installations.
To mount the ML–Trim:
1) The NEMA Industrial Electrical Enclosure that will house the ML–Trim must
conform to the following environmental conditions:
Temperature: 0 - 55 degrees C
(Internal NEMA enclosure temperature)
Humidity: 0 - 95% RH non-condensing
Environment: Pollution degree 2 macro - environment
Altitude: To 3300 feet (1000 meters)
NOTE: Allow adequate spacing between the ML–Trim and other equipment
to provide for proper heat convection. Placing the ML–Trim too close to
adjacent equipment could cause the interior ambient temperature to exceed
55 degrees C. Spacing requirements depend on air flow and enclosure
construction.
2) The dimensions for the door panel cutout are 3.65"+ .03" x 3.65 +.03"
(see Figure 2-1). Allow two inches of clearance on all sides of the cutout for
mounting clamp attachments, wire routing and heat convection.
3) Insert the ML–Trim through the door panel cutout until the gasket and bezel
are flush with the door panel (see Figure 2-1).
4) Slide the mounting clamps into the slots that are located on the top and
bottom of the ML–Trim. Tighten the mounting screws until the ML–Trim is
mounted securely in the NEMA Electrical Enclosure. Do not overtighten.
2 - 3
*
Use 115 VAC with ML-Trim model # 3200-1931
Use 230 VAC with ML-Trim model # 3200-1932
L1
*
Neut or L2
GND/PE
RS485 Serial
Communications
5V_DI
COM
LEAD_FQ
FDBK_FQ
COM
RUN
JOG
COM
R–STOP
F–STOP
COM
MST / FOL
SETPT
COM
V_DO
DRV_EN
ALARM
COM
USE COPPER WIRE ONLY. SELECT WIRE SIZE
ACCORDING TO AMPACITY FOR 60/75 C WIRE ONLY.
TIGHTEN J3 TERMINALS TO 5 LB-INS.
J1 J4
J3
T / R +
T / R –
COM_AUX
RS485
COMM
AUX
PWR
L1
NEUT
GND
PE
AC
POWER
INC
MAX_SPD
SPD
CMD
DRV_SIG
DRV_COM
AC POWER
115 VAC
0.1 AMPS
50 / 60 HZ
I / O
PWR
FREQ
INPUTS
DIGITAL
INPUTS
J5
DIGITAL
OUTPUTS
5V
COM_AUX
J2
Run
Jog
R-Stop
F-Stop
Master/
Follower
Setpoint
Select
Lead
Frequency
Sensor
Feedback
Frequency
Sensor
+5VDC External
DC Power
Supply
+5V COM
+5V
SIG
COM
+5V
SIG
COM
50V
MAX
+V
COM
R1
R2
External
DC Power
Supply
TD/RD+
TD/RD–
COM
Motor Drive
SIG
COM
1
2
3
1
2
1
2
3
1
2
123456789
101112131415161718
Fuses
1A
250V
2 - 4
Figure 2-2 ML–Trim General Wiring
WIRING
This section contains the input, output and serial communications wiring information for
the ML–Trim. Please read this section prior to wiring the ML–Trim to ensure that you
make the appropriate wiring decisions.
NOTE: The installation of this motor control must conform to area and local electrical
codes. See
National Fire Protection Association, or
Use local codes as applicable.
Use a minimum wire gauge of 18 AWG.
Use shielded cable to minimize equipment malfunctions from electrical noise.
Keep the AC power wiring (J3) physically separated from all other wiring on the
ML–Trim. Failure to do so could result in additional electrical noise and cause
the ML–Trim to malfunction.
A hand operated supply disconnect device must be installed in the final application. The primary disconnect device must meet EN requirements.
Inductive coils on relay, contactors, solenoids that are on the same AC power
line or housed in the same enclosure should be suppressed with an RC network across the coil. For the best results, use resistance (r) values of 50 ohms
and capacitance (c) values of 0.1 microfarads.
The National Electrical Code
The Canadian Electrical Code
(NEC,) Article 430 published by the
(CEC).
Install an AC line filter or isolation transformer to reduce excessive EMI noise,
such as line notches or spikes, on the AC power line.
DANGER
Hazardous voltages.
Can cause severe injury, death or
damage to the equipment.
The ML–Trim should only be
installed by a qualified
electrician.
2 - 5
–NOTES—
2 - 6
INPUTS
NOTE: The installation of this motor control must conform to area and local electrical
codes. See
National Fire Protection Association, or
Use local codes as applicable.
I/O Power (J5 pins 1, 2)
The National Electrical Code
The Canadian Electrical Code
(NEC,) Article 430 published by the
(CEC).
For isolated operations, the
Frequency Inputs (J5 pins 3, 4, 5),
the Digital Inputs (J5 pins 6-14 ) and
the Digital Outputs (J5 pins 15-18)
require an external source of
+5VDC power.
CAUTION: The ML-Trim is
shipped from the factory nonisolated with J4 and J5 jumpers.
You must remove the J4 and J5
jumpers before you connect the
External Power supply or you can
damage the equipment. Do not
exceed +5VDC on the I/O Power
Input.
Use the Auxiliary Power Output
(J4 pins 1, 2) to supply power to
non-isolated operations. The
ML-Trim is shipped from the factory
with the wiring defaulted to the nonisolated operation.
+5VDC MAXIMUM
1
2
J5
* Do not connect the External Power Supply
Common to Earth Ground.
+5V
COM
+5VDC
External
Power
Supply
Figure 2-3 I/O Power / Isolated
1
2
J4
+5V
COM_AUX
*
1
2
J5
Figure 2-4 I/O Power / Non-Isolated
2 - 7
AC Power (J3 pins 1, 2, 3)
The ML–Trim model #3200-1931
operates on 115 VAC + 15%, 0.1
Amp., 50/60 Hz. The ML–Trim model
#3200-1932 operates on 230 VAC
+ 15%, 0.1 Amp., 50/60 Hz.
* Fuse L1 for 115VAC applications. Fuse L1 and L2 for
230VAC applications. Use
1 Amp 250V normal blow
fuses.
L1
Neutral or L2
GND/PE
*
*
Figure 2-5 Input Power
1
2
3
J3
Lead Frequency (J5 pins 3, 5)
The Lead Frequency is a pulse train
input that the ML–Trim uses to
determine the speed of the lead
motor. For signal level specifications,
refer to
ML–Trim Specifications,
2 - 8
References: Appendix A
page A-1
3
,
5
J5
Signal
Common
Figure 2-6 Lead Frequency
Feedback Frequency
(J5 pins 4, 5)
The Feedback Frequency is a pulse
train input that the ML–Trim uses to
determine the speed of the follower
motor. For signal level specifications
refer to
ML–Trim Specifications,
References: Appendix A
page A-1.
If the Feedback Frequency is lost,
the ML-Trim will command a 100% Speed Out
and the motor will run at 100% capacity.
This can cause severe injury, death or
equipment damage.
,
Figure 2-7 Feedback Frequency
DANGER
4
5
J5
Signal
Common
Run (J5 pins 6, 8)
When the Run input (J5 pin 6) is
momentarily shorted to common, the
ML–Trim enters Run. As a
momentary input, Run is internally
latched and does not need to be
maintained by an operator device.
NOTE: Close the R–Stop and F–Stop
inputs prior to entering Run.
If you are only using one of
the Stop inputs, wire short the
other Stop input to common
or the ML–Trim will not enter
“Run”.
RUN
6
8
J5
Figure 2-8 Run
2 - 9
Jog (J5 pins 7, 8)
Jog is a maintained input. When Jog
is closed, the ML–Trim sends a
Speed Command Out signal to the
drive at the selected jog speed. As a
maintained input, Jog is only active
when the operator device is closed.
JOG
7
8
NOTE: Close the R–Stop and
F–Stop inputs and open the
Run input, prior to entering
Jog. If you are only using
one of the Stop inputs, wire
short the other Stop input to
common or the ML–Trim will
not enter Jog.
R–Stop (J5 pins 9, 11)
R–Stop is a momentary input. When
it is opened, the ML–Trim ramps to a
zero Speed Command Out at the
specified deceleration rate. As a
momentary input, R–Stop is internally
latched and does not need to be
maintained by an operator device.
J5
Figure 2-9 Jog
9
11
R-STOP
J5
2 - 10
Figure 2-10 R–Stop
F-Stop (J5 pins 10, 11)
F-Stop is a momentary input. When
it is open, the ML–Trim stops
immediately (zero RPM) and ignores
the specified deceleration rate. As a
momentary input, F-Stop is internally
latched and does not need to be
maintained by an operator device.
F-STOP
10
11
J5
Figure 2-11 F–Stop
Master or Follower
(J5 pins 12, 14)
This input determines the ML–Trim's
mode of operation and resulting
scaling formula that the control
algorithm uses. The ML–Trim is in
Master mode when the circuit is
open, and Follower mode if the circuit
is shorted to the common.
12
14
J5
MASTER
FOLLOWER
Figure 2-12 Master / Follower
2 - 11
Setpoint Select (J5 pins 13, 14)
The Master and Follower setpoints
are determined by the Setpoint Select
input combined with the Master/
Follower Input. For access to Master
Control Parameters 1 and 2 and
Follower Control Parameters 3 and 4,
refer to the chart below.
CONTROL
13
14
J5
PARAMETER 1 OR 3
CONTROL
PARAMETER 2 OR 4
Figure 2-13 Setpoint Select
Setpoint Select / Closed Setpoint Select / Open
Master/Follower
Input Open
Master/Follower
Input Closed
Master Control Parameter 1 Master Control Parameter 2
Follower Control Parameter 3
Follower Control Parameter 4
2 - 12
OUTPUTS
NOTE: The installation of this motor control must conform to area and local electrical
codes. See
National Fire Protection Association, or
Use local codes as applicable.
Speed Command Out
(J2 pins 1, 2)
The National Electrical Code
The Canadian Electrical Code
(NEC,) Article 430 published by the
(CEC).
Speed Command Out is an isolated
analog output signal that is sent to
the motor drive to control the speed
of the motor. Wire the Speed
SIGNAL INPUT
*
DRIVE COMMON
Speed Command Out
Isolated Common
1
2
Command Out into the Speed Signal
Input of the drive. If the motor drive
has a potentiometer speed control,
remove the potentiometer
connections and wire the Speed
Command Output to the
MOTOR DRIVE
Do not connect the Drive Isolated Common to other
*
Logic Commons
J2
potentiometer wiper input. The
ML–Trim's isolated common should
Figure 2-14 Speed Command Out
always be connected to the drive
common.
Drive Enable (J5 pin 16)
The Drive Enable output is activated (driven low) when the ML–Trim is signaling a
nonzero speed command to the motor drive, as defined by Drive Enable Logic (CP-74)
The Drive Enable output is driven high (relay deactivated) after Power Up and during
R–Stop and F–Stop. See Figure 2-15. Refer to
Output,
page 3-37 for details.
Operations: Logic Control, Logic
NOTE: This is an open-collector relay driver. For specification details, see
Appendix A
-
ML–Trim Specifications,
page A-1. Use an external DC power
supply to power the relays. Free-wheeling diodes are incorporated internally in
the ML–Trim and do not need to be added externally.
References:
2 - 13
Alarm (J5 pin 17)
By entering alarm Control Parameters, you can establish circumstances under which
the ML–Trim will alert you to potential operating problems. The alarm can be wired to
activate a warning light, a warning sound, or to shut down the system under specified
conditions. Alarm Format (CP-10) determines which alarm conditions will activate the
Alarm output, using the values that are entered in Low Alarm (CP-12), High Alarm
(CP-13), Ramped Error (CP-14) and Scaled Error (CP-15). See Figure 2-15. Refer to
Operations: Logic Control, Logic Output,
NOTE: This is an open-collector relay driver. Use an external DC power supply to
power the relays. Free-wheeling diodes are incorporated internally in the
ML–Trim and do not need to be added externally.
page 3-37 for details.
+V_DO
Drive Enable
Alarm
Common
15
16
17
18
J5
R1
R2
+
EXTERNAL
DC
POWER
SUPPLY
(50V Max)
–
Figure 2-15 Drive Enable and Alarm Outputs
Auxiliary DC Power (J4 pin 1, 2)
The 5 volt output (J4 pin 1) is a DC regulated output that can be used to power
encoders or other auxiliary equipment that is used in conjunction with the ML–Trim. If
this output is used, it will nullify optical isolation.
WARNING
Do not exceed
the maximum current output of
150 mA for +5 VDC.
2 - 14
Exceeding the maximum
current output
can damage the ML–Trim.
SERIAL COMMUNICATIONS
NOTE: The installation of this motor control must conform to area and local electrical
codes. See
National Fire Protection Association, or
Use local codes as applicable.
The Serial Communications interface on the ML–Trim complies with EIA Standard
RS–485-A for balanced line transmissions. This interface allows the host computer to
perform remote computer parameter entry, status or performance monitoring, and
remote control of the ML–Trim. See
information on using Serial Communications. The ML-Trim is designed to use with an
isolated RS232 to RS485 converter.
Figure 2-16 illustrates a multidrop installation of the Serial Communications link and
Figure 2-17 illustrates the Serial Communications connections.
The National Electrical Code
The Canadian Electrical Code
Operations: Serial Communications,
(NEC,) Article 430 published by the
(CEC).
page 3-49 for
Contrex
8 9
7
CODE
SELECT
4 5 6
SET
POINT
2 3
1
TACH
.
0
–
ENTER
CLEAR
Isolated
RS232 to RS485
Converter
Contrex
8 9
7
CODE
SELECT
4 5 6
SET
POINT
2 3
1
TACH
.
0
–
ENTER
CLEAR
Figure 2-16 ML–Trim Multidrop Installation
Contrex
CODE
SELECT
SET
POINT
TACH
7
4 5 6
1
–
CLEAR
Contrex
8 9
2 3
0
ENTER
Contrex
8 9
7
CODE
SELECT
4 5 6
SET
POINT
2 3
1
TACH
.
0
–
ENTER
CLEAR
Contrex
.
8 9
7
CODE
SELECT
4 5 6
SET
POINT
2 3
1
TACH
.
0
–
ENTER
CLEAR
8 9
7
CODE
SELECT
4 5 6
SET
POINT
2 3
1
TACH
.
0
–
ENTER
CLEAR
2 - 15
Isolated
RS232 to RS485
Converter
TXD/ TXD/
COM RXD RXD
— +
1. Shield only at one end of the cable.
2. If you need to terminate the communication line, then terminate
it at the unit which is the furthest away from the converter. A 100
ohm, 1/2 Watt resistor will usually terminate successfully. Refer
to EIA Standard RS485A, for more information.
J1
1
2
3
J1
2
1
2
3
1
ML–Trim #1
T/R+
T/R–
COM
ML–Trim #2
T/R+
T/R–
COM
2 - 16
Figure 2-17 ML–Trim Serial Communications Connections
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