Axis 7100 Service Manual Page 16
- Page / 74
- Table of contents
- BOOKMARKS
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I.10 System grounds
The following grounds are available in the system:
AGND — reference ground for analog inputs/outputs, internal analog ground
DGND — reference ground for digital inputs/outputs, optically isolated
XGND — ref. ground for external 25V aux. voltage, optically and inductively isolated
PGND — ref. ground for external supply for the position interfaces, optically isolated
GND — ground for internal electronics (also EGND), connected to AGND
I.11 Ballast circuit
When the motor is braking, energy is fed back to the servo amplifier. This energy is converted
into heat in the ballast resistor. The ballast resistor is switched in by the ballast circuit.
The maximum ballast power depends on the ballast resistor which is used and the ballast power
set in the software.
If you would like some help with dimensioning the ballast power required for your system, plea
-
se talk to our applications department.
Functional description:
1.- Single amplifier, not coupled via the intermediate circuit (DC+, DC-)
The circuit starts to respond from a intermediate circuit voltage of 720V.
If the power which is fed back from the motor is higher than the ballast power level
which is set, then the servo amplifier signals the status “Ballast power exceeded”
and the ballast circuit switches itself out.
At the next internal check of the intermediate circuit voltage (a fraction of a second
later) an overvoltage will be recognized and the controller will switch off with an
error message “Overvoltage” (see Chapter II.5).
2.- Several servo amplifiers coupled via the intermediate circuit circuit (DC+, DC-)
The energy which is fed back into the interm. circuit from all the motors is dealt
with by all the ballast resistors which are connected. This means that the servo
amplifier with the lowest ballast switch-on threshold (because of tolerances) will
switch in first.
If the regenerative power is lower than the ballast power of this servo amplifier
then the intermediate circuit voltage will not rise any further and no other servo
amplifiers will be switched in.
If the ballast power is insufficient then the servo amplifier will signal the status
“Ballast power exceeded”. The intermediate circuit voltage rises further and the
ballast circuit with the next higher threshold will switch in and so on.
If the total regenerative power is larger than the sum of all the ballast powers, then
all the servo amplifiers will signal “Ballast power exceeded”. The servo amplifier
with the lowest overvoltage threshold (according to tolerance) will switch off with
the error message “Overvoltage” and so switch off the complete system via the
BTB contact.
Internal ballast resistor: digifas™ 7103...7116 : 200W (as delivered)
digifas™ 7133...7150 : not available
External ballast resistor: digifas™ 7103...7108 : min. 75Ω, max. 2000W
digifas™ 7112...7116 : min. 50Ω, max. 2000W
digifas™ 7133...7150 : min. 15Ω, max. 4000W
Page I - 10 General Chapter I
01.98 digifas™ 7100 series
With digifas™ 7103...7116 the link +R ó -R must be removed
if you want to use an external ballast resistor.
- Digital Servodrive 1
- Mat. no. 83498 2
- Contents 3
- Contents Diagram Page 3
- Safety instructions 5
- Directives and standards 6
- -conformance 6
- I General 7
- I.1 About this manual 7
- I.4 Nameplate 8
- I.5 Equipment description 9
- - A.4.012.4/26 11
- Chapter I General Page I - 5 11
- - A.4.012.4/14 12
- Page I - 6 General Chapter I 12
- - A.4.012.4/38 13
- Chapter I General Page I - 7 13
- Page I - 8 General Chapter I 14
- 01.98 digifas™ 7100 series 14
- Chapter I General Page I - 9 15
- I.10 System grounds 16
- I.11 Ballast circuit 16
- II.1 Important instructions 17
- - A.4.012.1/3 20
- - A.4.012.1/2 21
- - A.4.012.1/8 22
- - A.4.012.1/5 23
- - A.4.012.1/6 24
- - A.4.012.4/27 25
- - A.4.012.4/35 26
- - A.4.029.4/1 27
- A.4.029.4/2 28
- II.3 Commissioning 30
- II.4 Parameter description 32
- II.4.1 General 32
- II.4.2 Current controller 33
- II.4.3 Speed controller 33
- II.4.4 Service functions 34
- II.4.5 Display actual value 34
- III.1 Input functions 35
- III.1.1 Analog inputs 35
- III.2 Output functions 36
- III.2.1 Analog outputs 36
- III.2.2 Digital outputs 36
- III.2.3 Brake 37
- IV Interfaces and options 39
- IV.3 PC interface 41
- - A.4.012.3/1 43
- IV.5.2 Important notes 45
- IV.5.3 Commissioning 46
- - A.4.011.1/15 47
- V Drawings 49
- - A.4.011.1/7 50
- Page V - 2 Drawings Chapter V 50
- - A.4.011.1/8 51
- Chapter V Drawings Page V - 3 51
- - A.4.012.4/30 52
- Page V - 4 Drawings Chapter V 52
- - A.4.012.4/28 53
- Chapter V Drawings Page V - 5 53
- - A.4.012.4/36 54
- Page V - 6 Drawings Chapter V 54
- - A.4.012.4/37 55
- Chapter V Drawings Page V - 7 55
- - A.4.011.4/26 56
- Page V - 8 Drawings Chapter V 56
- - A.4.012.4/29 57
- Chapter V Drawings Page V - 9 57
- - E.4.947.4/21 58
- - A.4.012.4/31 59
- - A.4.012.4/32 60
- - A.4.012.4/33 61
- VI Appendix 63
- - A.4.012.1/4 64
- - A.4.012.1/9 66
- VI.4 Fault-finding 68
- VI.5 Glossary 70
- VI.6 Parameter list 72
- VI.7 Index 73
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