ABB MTAC-01 User manual

ABB Drives
User’s Manual
Pulse Encoder Interface Module
MTAC-01

Pulse Encoder Interface Module
MTAC-01
User’s Manual
3AFE68591091 REV B
EN
EFFECTIVE: 04.04.2006
©2006 ABB Oy. All Rights Reserved.

5
Safety
Safety
Overview
This chapter states the general safety instructions that must be
followed when installing and operating the MTAC-01 Pulse
Encoder Interface module.
The material in this chapter must be studied before attempting any
work on, or with, the unit.
In addition to the safety instructions given below, read the
complete safety instructions of the specific drive you are working
on.
General safety instructions
WARNING! All electrical installation and maintenance work on the
drive should be carried out by qualified electricians.
The drive and adjoining equipment must be properly grounded.
Do not attempt any work on a powered drive. After switching off
the input power, always allow the intermediate circuit capacitors
5 minutes to discharge before working on the drive, the motor or
the motor cable. It is good practice to check (with a voltage
indicating instrument) that the drive is in fact discharged before
beginning work.
The motor cable terminals of the drive are at a dangerously high
voltage when input power is applied, regardless of motor
operation.
There can be dangerous voltages inside the drive from external
control circuits even when the drive input power is shut off.
Exercise appropriate care when working on the unit. Neglecting
these instructions can cause physical injury or death.

6
Safety

7
Table of contents
Table of contents
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table of contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Preparing for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installing the module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
01 OPERATING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
50 ENCODER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
19 TIMER & COUNTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Faults/Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

8
Table of contents

9
Installation
Installation
Preparing for installation
MTAC-01 module
The MTAC-01 Pulse Encoder Interface module is an interface for
connecting a digital pulse encoder to an ACS350 drive. A pulse
encoder should be used if accurate speed or position (angle)
feedback from the motor shaft is required.
Module layout
Compatibility
The MTAC-01 module is compatible with all ACS350 drives. To
confirm compatibility with a particular pulse encoder, compare the
pulse encoder requirements to Specifications on page 25.
SCR
A
B
Z
GND
Vin
Vout

10
Installation
Installing the module
Delivery check
The MTAC-01 module package contains:
• MTAC-01 module
• grounding stand-off
• panel port adapter
• this manual.
Mounting
WARNING! Follow the safety instructions given in this manual and
in the ACS350 User’s Manual [3AFE68462401 (English)].
To mount the MTAC-01 module:
1. If not already off, disconnect the input power from the drive.
After disconnecting the input power, wait for 5 five minutes
before you start working on the drive.
2. Remove the possible control panel or panel cover from the
drive.
3. Remove the grounding screw in the top left corner of the drive’s
control panel slot and install the grounding stand-off in its place.
4. Ensure that the panel port adapter is attached to either the
panel port of the drive or the mate part of the MTAC-01 module.
5. Gently and firmly install the MTAC-01 module to the drive’s
panel slot directly from the front.
Note: Signal and power connections to the drive are automatically
made through a 6-pin connector.
6. Ground the module by inserting the screw removed from the
drive in the top left corner of the MTAC-01 module. Tighten the
screw.

11
Installation
Note: Correct insertion and tightening of the screw is essential for
fulfilling the EMC requirements and proper operation of the
module.
7. Install the possible control panel or panel cover on the MTAC-01
module.
5
6
4
3

12
Installation
Wiring – General
The pulse encoder should be connected to the MTAC-01 module
with cables as specified below.
Terminal designations
Use the following table for reference when wiring terminals.
Cable construction 4 × (2+1) twisted pair cable with
individual and overall shields
Conductor cross-sectional area 0.5 to 1.5 mm220 to 16 AWG
Maximum cable length 100 m 330 ft
Identification Description
MTAC Encoder
SCR SCR/
Shield
Used for grounding of the encoder cable shields.
Connected internally to the drive ground.
SCR
Vin Vcc/PWR Connected to the external power supply.
Vout Vcc/PWR Connected to the encoder.
GND 0 V / GND One connected to the ground of the external power
supply and the other to the ground of the encoder.
GND
A1AA+
• Max. signal frequency: 200 kHz
• Signal levels:
• Decision levels are automatically defined based
on the daisy chained power supply voltage level.
• Input channels are isolated from the logic and
ground.
• When the drive runs in the Forward direction,
channel A should lead channel B by 90°
(electrical).
• Channel Z: One pulse per revolution (used in
positioning applications only).
A1 A A-
B2BB+
B2 B B-
Z3ZZ+
Z3 Z Z-
Logic “1” Logic “0”
24 V 12.1 V 8.3 V
15 V 7.5 V 5.3 V
5V 2.5V 1.9V

13
Installation
Wiring – Encoder power
The MTAC-01 module does not supply power for the encoder. An
external power supply (as diagrammed below) is recommended.
The drive’s 24 VDC supply from terminals X1A:9 (+24V) and
X1A:10 (GND) can be used if the total draw on the supply does
not exceed 200 mA. Use the following table to determine if the
drive’s supply can be used.
1. Connect as follows:
Wiring – Encoder
1. Determine the encoder wiring configuration:
• Refer to Phasing on page 14 to determine if the encoder has
normal pulse order – encoder channel A/1 pulse leads channel
B/2 pulse.
• Refer to Encoder output types on page 15 to determine the
encoder’s output type.
• For push-pull types, refer to the manufacturer’s
recommendation for connection – either single-ended or
differential can be used.
Loads using the drive’s 24 VDC supply mA
Number of digital inputs used
(DI1…DI5)
x 15 mA each =
MTAC-01 = 35
Encoder current requirement =
Total requirements for any other user connection(s) to drive’s
24 VDC =
Total (must be less than 200 mA) =
Vcc
Vcc
0V
0V
GND
GND
SCR
Vout
Vin
SCR
MTAC-01 module
External power supply
Encoder

14
Installation
2. Refer to Wiring diagrams on page 16, select the appropriate
diagram, and wire the encoder.
Note: Normally, ground the cable shield only at the drive end.
However, if the encoder is isolated from the motor and from the
ground, connect the cable shields to both the MTAC module and
the encoder housing.
Note: Do not route the encoder cables parallel to power (e.g.
motor) cables.
3. Verify correct encoder phasing. See options below.
Phasing
When the encoder is connected correctly, running the drive in the
Forward (positive speed reference) direction should produce a
positive encoder speed feedback.
Option A: Oscilloscope test. On incremental encoders, the two
output channels, usually marked A and B or 1 and 2, are 90°
(electrical) apart from each other. When rotated clockwise, most
encoders – but not all – have channel A/1 leading channel B/2 as
illustrated below. Determine the leading channel by referring to the
encoder documentation or by measuring with an oscilloscope.
The encoder output channel that leads when the drive runs
Forward should be connected to MTAC terminal A. The output
channel that trails should be connected to MTAC terminal B.
A or 1
Aor 1
B or 2
Bor 2
Z or 0
Zor 0
Diagrams show normal phasing:
Pulse A/1 leads (i.e. rises earlier
than) pulse B/2.
90°
Connect the zero reference
output channel (usually marked
0, N or Z) only if parameter 5010
ZPLS ENABLE = 1 (ENABLE).

15
Installation
Option B: Functional test. For this test:
• Temporarily, switch the drive to scalar mode [parameter 9904
MOTOR CTRL MODE = 3 (SCALAR:FREQ)], if not already
there.
• Run the drive in the forward direction.
• Verify that parameter 0147 MECH REVS is increasing in the
positive direction.
• If not, switch the A/A (or 1/1) connections.
Encoder output types
The following diagrams identify the typical encoder output types.
Push-pull Open collector
(sinking)
Open emitter
(sourcing)
VCC = Encoder input power supply voltage
RL = Load resistor at encoder output channel
OUT
VCC
OUT
VCC
RL
OUT
VCC
RL

16
Installation
Wiring diagrams
Push-pull type encoder output
Diagram assumes normal pulse order in Forward
rotation: Pulse A/1 leads as diagrammed on the
right.
For encoders with pulse 2 leading, change the diagram for these
connections:
• Encoder A/1 and B/2 should be wired to MTAC terminals B and A,
respectively.
• Encoder A/1 and B/2 (if present) should be wired to MTAC terminals
Band A, respectively.
Differential connection
A/1
B/2
1
1
0
0V VCC
2
2
0
SCR
1)
A
A
B
B
Z
Z
MTAC-01 module
1) Connect the cable shield at the encoder housing, if, and only if, the encoder is
isolated from the motor, and from the ground.
Encoder
power
supply
SCR
Vin
GND
Vout
GND
SCR
Encoder

17
Installation
Single-ended connection
1) Connect the cable shield at the encoder housing, if, and only if, the encoder is
isolated from the motor, and from the ground.
1
0
0V VCC
2
SCR
1)
A
A
B
B
Z
Z
MTAC-01 module
Encoder
power
supply
SCR
Vin
GND
Vout
GND
SCR
Encoder

18
Installation
Open collector (sinking) encoder output
Diagram assumes normal pulse order in Forward
rotation: Pulse A/1 leads as diagrammed on the
right.
For encoders with pulse B/2 leading, change the diagram for these
connections:
• Encoder A/1 and B/2 should be wired to MTAC terminals B and A,
respectively.
A/1
B/2
1
0
0V VCC
2
SCR
1)
A
A
B
B
Z
Z
MTAC-01 module
1) Connect the cable shield at the encoder housing, if, and only if, the encoder is
isolated from the motor, and from the ground.
2) Three identical resistors whose size depends on the encoder power supply
Vin =V
out:
Vin = 30 V: RL= 2.7…3.0 kohm, 0.5 W
Vin = 24 V: RL= 1.8…2.2 kohm, 0.5 W
Vin = 15 V: RL= 1.0…1.5 kohm, 0.5 W
Vin = 5 V: RL= 390…470 ohm, 0.125 W
Encoder
power
supply
SCR
Vin
GND
Vout
GND
SCR
Encoder RL
2)

19
Installation
Open emitter (sourcing) encoder output
Apply power
1. Turn on the input power to the drive.
2. Continue with the next chapter, Start-up.
Diagram assumes normal pulse order in Forward
rotation: Pulse A/1 leads as diagrammed on the
right.
For encoders with pulse B/2 leading, change the diagram for these
connections:
• Encoder A/1 and B/2 should be wired to MTAC terminals B and A,
respectively.
A/1
B/2
1) Connect the cable shield at the encoder housing, if, and only if, the encoder is
isolated from the motor, and from the ground.
2) Three identical resistors whose size depends on the encoder power supply
Vin =V
out:
Vin = 30 V: RL= 2.7…3.0 kohm, 0.5 W
Vin = 24 V: RL= 1.8…2.2 kohm, 0.5 W
Vin = 15 V: RL= 1.0…1.5 kohm, 0.5 W
Vin = 5 V: RL= 390…470 ohm, 0.125 W
1
0
0V VCC
2
SCR
1)
A
A
B
B
Z
Z
MTAC-01 module
Encoder
power
supply
SCR
Vin
GND
Vout
GND
SCR
Encoder
RL
2)

20
Start-up
Start-up
Configuration
To configure the operation of the MTAC-01 module:
1. Power up the drive.
2. Use the control panel on the drive or the DriveWindow Light
PC tool and set group 50 ENCODER parameters described on
page 21.
Encoder operating data
The following actual signals, based on measurements or
calculations, provide feedback from the encoder. You cannot set
these values directly, but you can use group 50 ENCODER
parameters to control the mechanical angle and revolution data.
No. Name/Value Description FbEq 1)
01 OPERATING DATA
0146 MECH ANGLE Calculated mechanical angle 1 = 1
0147 MECH REVS Mechanical revolutions, i.e. the motor shaft
revolutions calculated by the encoder
1 = 1
0148 Z PLS
DETECTED
Encoder zero pulse detector. 0 = not detected,
1 = detected
1 = 1
1) Fieldbus equivalent, scaling between the value and the integer used in serial communication.