AMCI SD4840EK, User Manual

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20 Gear Drive, Plymouth Ind. Park, Terryville, CT 06786
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Tel: (860) 585-1254 Fax: (860) 584-1973 http://www.amci.com
SD4840EK User Manual
C
ONFIGURATION
D
ATA
F
ORMAT
57
CFG_Word_1 Format (continued)
† Active Low: The SD4840EK will report that the input is active when it is not conducting current.

Active High: The SD4840EK will report that the input is active when it is conducting current.
Table R5.4 Configuration Word 1 Bits
Current Loop Gain
This feature gives you the ability to adjust the gain of the power amplifiers in the SD4840EK to match the
electrical characteristics of your motor. The value of this parameter can range from 1 to 80 with 80 represent-
ing the largest gain increase. In general, using a larger gain will increase high speed torque but the motor will
run louder. A lower gain will offer quieter low speed operation at the cost of some high speed torque.
The use of this feature is completely optional and you can leave the Current Loop Gain at its default setting of
“1” for standard motor performance.
AMCI motors should use a Current Loop Gain value of “5”.
High induction motors, often referred to as “tin can” steppers, need a higher Current Loop
Gain setting for normal operation. For these motors, start with a Current Loop Gain of “20”.
If your motor stalls at high speeds, use the motor's torque curve to verify that it is able to gen-
erate sufficient torque at the required speed. If it should, increase the Current Loop Gain value
to see if its setting has any effect.
...Set These Bits To
To Make These Settings...
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Input 1
Active Low
†
0
Active High
†
1
Input 2
Active Low
†
0
Active High
†
1
Input 3
Active Low
†
0
Active High
†
1
DC_Sync
Disabled
0
Enabled
1
OUT1_State_

at_Conn_Lost
Output Off
0
Output Conducting
1
OUT1_Action_
On_Conn_Lost
Retain Last Value
0
Use state of bit 12
1
OUT1_Function Fault Output
0
GP Output
1
Resulting Bit Pattern:
0 0 0 0 0 0 0 0 0
Hexadecimal Digits for

CoE Configuration Setting: