httl speed feedb$ck option
1
HTTL SPEED FEEDBACK OPTION
Description
The HTTL Speed Feedback Option allows incremental encoders to be connected directly to the
motor controller to provide highly accurate speed feedback measurement.
Features
The option has the following features:
x Contains up to four optically isolated differential inputs on channels A, B, M and H
x Decoding logic to interface the encoder to the microprocessor
x Supplies variable voltage, isolated encoder power supply
Used On
The HTTL Speed Feedback Option is provided in two forms:
1.
Technology Box -for use with the 605C Inverter and 690+ Frames C-K Inverter
2.
Speed Feedback Board - for use with the 690+ Frame B
Specifications
Technology Box
Speed Feedback Board
Maximum Pulse Rate
250kHz
250kHz
Receiver Current
d10mA per channel
d10mA per channel
Input Format
Two channels in quadrature,
clock/dir or clock only
Two channels in quadrature,
clock/dir or clock only
Phase Displacement
>1µs
>1µs
Input Voltage
10 - 30V differential
recommended, or singleended
10 - 30V differential
recommended, or singleended
Encoder Supply
Maximum load = 200mA or
2W, whichever is smaller.
Voltage adjustable
approximately 10-20V by
firmware
Maximum load = 200mA or
2W, whichever is smaller.
Voltage adjustable
approximately 10-20V by
firmware
Terminal Wire Size
(maximum)
16 AWG
16 AWG
Terminal Tightening
Torque
0.4Nm (3.5 pound-inches)
0.2Nm (1.75 pound-inches)
Recommended Spare Parts
We recommend that you keep one option as a spare to reduce down-time.
HTTL Speed Feedback Technology Box
2
Installation
WARNING!
Disconnect all sources of power before attempting installation. Injury or death
could result from unintended actuation of controlled equipment.
Caution
This option contains ESD (Electrostatic Discharge) sensitive parts. Observe static control
precautions when handling, installing and servicing this option.
Wiring the System : 605C, 690+ Frames C-K
earthing screw
Figure 1 Installing the HTTL Speed Feedback Technology Box Option
(605C illustrated)
1. Unpack and handle the Option using correct static safety procedures.
2. Remove the inverter terminal cover and securing screws.
3. Carefully plug the Option into the left-hand port (as illustrated above) ensuring correct
alignment of the connector and tighten the earthing screw. You can operate the Inverter with
the Speed Feedback and/or a Communications Technology Box, but you cannot use two
options of the same kind.
HTTL Speed Feedback Technology Box
3
DIP Switch Settings
The DIP switch can be seen
through the casing of the
HTTL Speed Feedback
Technology Box.
The switch settings control
the following inputs:
DIP SWITCH
ON
1
2
3
4
OFF
Input Threshold
DIP
Switch Number
1
2
3
4
Input Controlled
H
A
B
M
3V±1
On
On
On
On
8V±1
Off
Off
Off
Off
TB1
Usually the switches will be set to give a threshold of 3V when using a differential encoder, and
to 8V when using a single-ended encoder. (Factory default is with switches 1 & 2 set in the ON
position - 3V).
Terminal Block (TB1) Connections
H /H
1 2
TB1 - TECHNOLOGY BOX
supply
A /A
B /B M /M + - GND
5 6
3 4
7 8 9 10 11
H /H
1 2
TB1 - TECHNOLOGY BOX
supply
A /A
B /B M /M + - GND
4
5
6
8
9 10 11
3
7
H /H
A /A
H
A
B /B
M /M + - 0V
supply
ENCODER
Figure 3 Differential Encoder Outputs
B
M
+ - 0V
supply
ENCODER
Figure 2 Single-Ended Encoder Outputs
For correct operation, A, /A, B and /B must be connected as shown. If any is left unconnected,
the HTTL speed feedback technology box will not operate.
Note: The M and H inputs are not normally connected - these are for use with future versions of
drive software.
M: For connection to the once-per-revolution marker output from the encoder to verify
correct operation of the encoder.
H: For where the encoder has provision for a `health output.
Take special care wiring the encoders to the option due to the low level of the signals.
All wiring to the HTTL Speed Feedback Technology Box should be made in screened cable.
Use cable with an overall screen and a screen over each individual pair. To ensure compliance
with the EMC Directive the overall cable screen should be connected to the encoder body and to
the terminal block, pin 11.
Recommended cable (pairs individually screened):
Belden equivalent 8777
SSD Drives Part Number CM052666
HTTL Speed Feedback Technology Box
4
Understanding the LED Indications
Module LED
In normal operation this LED will be ON. If it fails to come on within 10 seconds after powerup check that the Technology Box is correctly installed.
Encoder LED
This will indicate the status of the Health inputs, pins 1 and 2 on future versions of drive
software. If the voltage across pins 1 and 2 exceeds the Minimum Differential Input Voltage set
by the DIP switch, the Encoder LED will be ON (pin 1 is positive with respect to pin 2).
Wiring the System : 690+ Frame B
cable tie loop
Speed Feedback Board
Comms Technology Option
Figure 4 The HTTL Speed Feedback Board fitted to 690+ Frame B
The option is factory-fitted using correct static safety procedures. The cable tie loop is used to
secure the connecting cable so that it doesn!t obstruct the LED light pipes used by the Comms
Technology Option.
HTTL Speed Feedback Technology Box
5
DIP Switch Settings
The DIP switch settings control the
following inputs:
Input Threshold
HTTL Speed Feedback Option
Switch Number
1
2
Input Controlled
A
B
3V±1
On
On
8V±1
Off
Off
ON
1
6
TB1
Usually the switches will be set to give a threshold of 3V
when using a differential encoder (as shown), and to 8V
when using a single-ended encoder. (Factory default is
with switches 1 & 2 set in the ON position - 3V).
DIP
DIP SWITCH
ON
POSITIONS 3 & 4
ARE NOT USED
1
2
3
4
OFF
Terminal Block (TB1) Connections
TB1 - TECHNOLOGY OPTION
supply
B /B
A /A
+ 5 6
3 4
1 2
cable
clamp
+ supply
0V
A
/A
B /B
GND
ENCODER
Figure 5 Differential Encoder Outputs
TB1 - TECHNOLOGY OPTION
supply
B /B
A /A
+ 5 6
3 4
1 2
cable
clamp
+ supply
0V
A
B
GND
ENCODER
Figure 6 Single-Ended Encoder Outputs
Note: The GND connection shown above is the screen connection, some encoder manufacturers
use a different terminology.
For correct operation, A, /A, B and /B must be connected as shown. If any is left unconnected,
the HTTL speed feedback technology box will not operate.
Take special care wiring the encoders to the option due to the low level of the signals.
All wiring to the Speed Feedback option should be made in screened cable. Preferably, use
cable with an overall screen and a screen over each individual pair. To ensure compliance with
the EMC Directive the overall cable screen should be connected to the encoder body and to the
cable clamp.
Recommended cable:
Belden equivalent 8164 - overall screen and pairs individually screened
Belden equivalent 8777 - pairs individually screened, SSD Drives Part No CM052666
HTTL Speed Feedback Technology Box
6
Initial Set-up
Configuring the 605C Inverter
MMI Menu Map
1
SETUP PARAMETERS
2
FUNCTION BLOCKS
3
INPUTS & OUTPUTS
4
ENCODER
ENCODER MODE
Using the Operator Station (MMI) or
other suitable PC programming tool,
the ENCODER function block requires
configuring before the HTTL option
can be used.
ConfigEd Lite is SSD Drives
Windows-based block programming
software.
ENCODER
SPEED Hz [568] ! 0.0 Hz
SPEED RPM [569] ! 0 n/min
SPEED % [749] ! 0.00%
POSITION [748] ! 0
QUADRATURE ! [565] MODE
!
1000  [566] LINES

FALSE  [567] INVERT

FALSE ! [747] RESET
!
ENCODER LINES
ENCODER INVERT
10.0V  [761] SUPPLY

ENCODER RESET
ENCODER SUPPLY
ENCODER SPEED
ENCODER SPEED
ENCODER SPEED
ENCODER POSITION
Parameter Descriptions
Range: Enumerated, see below
MODE
This must be set to QUADRATURE, CLOCK/DIR or CLOCK.
Quadrature
A wrt /A
B wrt /B
direction = forward
direction = reverse
(assumes ENCODER INVERT is FALSE)
Clock/Dir
A wrt /A
B wrt /B
direction = forward
direction = reverse
(assumes ENCODER INVERT is FALSE)
Clock
A wrt /A
B wrt /B
(ignored)
direction = forward
direction = forward
(assumes ENCODER INVERT is FALSE)
Enumerated Value : Encoder Mode
0 : QUADRATURE
1 : CLOCK/DIR
2 : CLOCK
HTTL Speed Feedback Technology Box
7
Range: 1 to 10000
LINES
The number of lines must be set to match the type of encoder being used. Incorrect setting of
this parameter will result in an erroneous speed measurement.
Range: FALSE / TRUE
INVERT
When TRUE, changes the sign of the measured speed and the direction of the position count.
RESET
When TRUE, the POSITION output is set (and held) at zero.
Range: FALSE / TRUE
SUPPLY
Approximate encoder supply voltage.
Range: 10.0 to 20.0V
SPEED Hz
Speed feedback in Hz.
Range: xxx.xHz
SPEED RPM
Speed feedback in RPM.
Range: xxxxx n/min
SPEED %
Speed feedback as a percentage of MAXIMUM SPEED.
Range: xxx.xx%
Range:
POSITION
(increments @ 4 x line rate, i.e. 1 revolution = 4000 for a 1000 line encoder)
Number of encoder !counts" from when RESET was set to FALSE. The value will increment or
decrement depending on the direction the encoder is rotated. The value will !wrap around"
between 32767 and -32768.
HTTL Speed Feedback Technology Box
8
Configuring the 690+ Inverter
MMI Menu Map
1 SETUP
2 MOTOR CONTROL
3 FEEDBACKS
ENCODER SUPPLY
ENCODER LINES
ENCODER INVERT
QUADRATIC TORQUE
DC LINK VOLTS
Using the Operator Station (MMI) or other
suitable PC programming tool, this function
block requires configuring before the HTTL
option can be used.
ConfigEd Lite is SSD Drives Windowsbased block programming software.
Ranges for some outputs are given as
!#.xx %", for example, indicating an
indeterminate integer for the value, to two
decimal places.
TERMINAL VOLTS
SPEED FBK RPM
SPEED FBK HZ
Note that only parameters relevant to the
Encoder are described below.
SPEED FBK %
Feedbacks










10.0 V 
** 2048 
FALSE 
FALSE 
DC LINK VOLTS
[ 75]
TERMINAL VOLTS
[1020]
SPEED FEEDBACK
[569]
RPM
SPEED FEEDBACK HZ
[568]
SPEED FEEDBACK %
[749]
ENCODER COUNT
[1016]
TORQUE FBK
[ 70]
FIELD FBK
[ 73]
MOTOR CURRENT %
[ 66]
MOTOR CURRENT
[ 67]
[761] ENCODER SUPPLY
[566] ENCODER LINES
[567] ENCODER INVERT
[ 50] QUADRATIC TORQUE
 0V
 0V
 0.00 rpm











0.00 Hz
0.00 %
0
0.00 %
0.00 %
0.00 %
0.0 A
ENCODER COUNT
TORQUE FEEDBACK
Parameter Descriptions
FIELD FEEDBACK
MOTOR CURRENT %
MOTOR CURRENT A
ENCODER SUPPLY
Range: 10.0 to 20.0V
Set this to the supply voltage required by the encoder.
ENCODER LINES
Range: 250 to 1000000
The number of lines must be set to match the type of encoder being used. Incorrect setting of
this parameter will result in an erroneous speed measurement.
** Set to a value depending on the overall !power build ! of the Inverter.
ENCODER INVERT
Range: FALSE/TRUE
Used to match the encoder direction to the motor direction. When TRUE, it changes the sign
of the measured speed and the direction of the position count.
It is especially necessary to set up this parameter when in CLOSED-LOOP VEC mode, as the
encoder direction must be correct for this mode to operate.
SPEED FEEDBACK RPM
Range: " .xx rpm
The mechanical speed of the motor shaft in revolutions per minute.
SPEED FEEDBACK HZ
Range: " .xx Hz
This parameter changes according to the CONTROL MODE (MOTOR DATA function
block):
x In CLOSED-LOOP VEC mode, or SENSORLESS VEC mode, the parameter shows the
mechanical speed of the motor shaft in revolutions per second.
x In VOLTS / Hz mode, the parameter shows the drive output frequency.
Range: " .xx %
SPEED FEEDBACK %
Shows the mechanical speed of the motor shaft as a percentage of the user maximum speed
setting (MAX SPEED in the SETPOINT SCALE function block).
ENCODER COUNT
Range: " .
(increments/decrements @ 4 x line rate, i.e. 1 revolution = 4000 for a 1000 line encoder)
This is a 16-bit register which is incremented or decremented by the pulses from the encoder.
It is useful to check that the encoder is operating, and to measure the encoder lines, if this is
not known. Rotate the motor shaft through 1 revolution and note the difference between
readings at the start and finish. The difference should be 4 times the encoder lines. For greater
accuracy, rotate the shaft through several revolutions.
The direction of count is unaffected by ENCODER INVERT.
HTTL Speed Feedback Technology Box
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising