Epson C117001-N Service Manual - Page 67

Deceleration Control Curve, Operating Principle, Service - dfx plus

Get Epson C117001-N - DFX 5000+ B/W Dot-matrix Printer PDF manuals and user guides
UPC - 010343816480
View all Epson C117001-N manuals
Add to My Manuals
Save this manual to your list of manuals

Page 67 highlights

Operating Principle DFX-5000+ Service Manuai SpeeciO - SP1 1. It causes the carriage to accelerate. 2. Because the control circuit measures time periods with the encoder signal, when the carriage speed reaches SP1, it changes to the next sequence (SP1 - SP2). SP1 - SP2 1. The DFX-5000+ printer has a table programmed into its main program ROM to determine the duration of the acceleration pulses. This table is called the duty data table. Duty data is divided into ten sections, plus Dutymin. Section 1 is the largest, and Dutyti represents the minimum duty data for acceleration control. Pulse width modulation (PWM) determines each section number. For each section, the carriage motor driver is turned on part of the time and off part of the time. 2. When the carriage speed reaches SP1, the printer uses the acceleration driving mode, based on the duty data, and the rest of the time, it uses Deceleration driving mode 2. (Refer to Table 2-5.) 3. During this time the control circuit measures time periods using the encoder signal, and controls the following: Cl When duty data becomes Duty~ti before the carriage speed reaches SP2. Then, when the carnage speed reaches SP2, the next sequence (SP2-) takes effect. D When the carriage speed reaches SP2 before duty data becomes Dutyfi, the next sequence (SP2-) takes effect. SP2 - When the carriage speed reaches SP2, PI control oversees the carriage speed. D Deceleration control Deceleration control provides smooth deceleration and prevents rapid vibration. Note: : 1 Deceieratbn 2 B 4Dacalf%on 1 1 msec PWM parcdic time ; ;~,, ;;; : ! : : :::: : : Decalaratica 3 Figure 2-25. Deceleration Control Curve In Figure 2-25, the deceleration curve is labeled A and the driving modes are labeled B. 1,2, and 3 indicate the PWM control section number. 2-28 Rev. A

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
Operating Principle
DFX-5000+
Service
Manuai
SpeeciO
-
SP1
1.
2.
SP1
1.
2.
3.
It causes the carriage to accelerate.
Because the control circuit measures time periods with the encoder signal, when the carriage
speed reaches
SP1,
it changes to the next sequence
(SP1
-
SP2).
-
SP2
The
DFX-5000+
printer has a table programmed into its main program ROM to determine the
duration of the acceleration pulses. This table is called the duty data table. Duty data is divided
into ten sections, plus
Dutymin.
Section 1 is the largest, and
Dutyti
represents the minimum
duty data for acceleration control. Pulse width modulation
(PWM)
determines each section
number. For each section, the carriage motor driver is turned on part of the time and off part of
the time.
When the carriage speed reaches
SP1,
the printer uses the acceleration driving mode, based on
the duty data, and the rest of the time, it uses Deceleration driving mode 2. (Refer to Table 2-5.)
During this time the control circuit measures time periods using the encoder signal, and
controls the following:
Cl
When duty data becomes
Duty~ti
before the carriage speed reaches
SP2.
Then, when the
carnage speed reaches
SP2,
the next sequence
(SP2-)
takes effect.
D
When the carriage speed reaches
SP2
before duty data becomes
Dutyfi,
the
next sequence
(SP2-)
takes effect.
SP2
-
When the carriage speed reaches
SP2,
PI control oversees the carriage speed.
D
Deceleration control
Deceleration control provides smooth deceleration and prevents rapid vibration.
:
1
;
;
~
;
4
,,
;;
Deceieratbn
2
B
:
:
Dacalf%on
1
:
:
:
:
!
:
:
:
1
msec
Decalaratica
3
PWM
parcdic
time
Figure 2-25. Deceleration Control Curve
Note:
In
Figure 2-25, the deceleration curve is labeled A and the driving modes are labeled B.
1,2, and 3 indicate the
PWM
control section number.
2-28
Rev.
A