DYNAPAR max jr speed 1 Manuel technique - Page 4

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OPERATION ...
BLOCK
DIAGRAM
1 ' - - - - " ' - ' - - = - _ 0 = . _ - - - - - - - - - - - 1
,
,
IN1,2
: (increasel
I
decrease
,
or
, quadrature
:
AB)
,
,
,
,
:~A!J~S~~_
51GB
(run/stop
&
run/pgm)
,
,
,
~
ADJUST
,
MODE
,
,
1
,
,
!
,
,
ADJUST
~
RATE
,
,
,
,
- -
--------------
,
RAMP
f----
---
RATE
FULL
0
SCALE
SPEED
r---
1
FULL
SPEED
SCALE
SETPOINT
FREQUENCY
1
1
@
@
I - -
L-..,
,---
digital to
analog
converter
i
command
+
correction
1
0
f----
ANALOG
(drive output)
1 - - - - - - -
,
IN1
,(ramp hold)
--
,
i
; MAXj,-SPee(t ., - - - - :
r
i
,
IN2
--+-
+
I - -
,
,
FULL SClE SPEED
ERROR
GAIN
,
,
(trim reset)
,
COUNTER
SET POINT
,
,
~M~Xl'!~1_
- -
,
-
-
-------,::-'--
-
I - -
DISPLAY
(actual speed)
----
0
i
one second
I - -
time- base
tachometer
FULL SCALE FREQUENCY
DESCRIPTION
The Speed Setpoint (line 2) value is the desired running speed.
This number can be changed (see page 5) directly or
incrementally. Whenever the number is changed, it will not be
allowed to exceed the Full Scale Speed (line 7).
Speed Setpoint
o
command voltage
=
x
10 VDC
Full Scale Speed
On the MAXjr Speed 3, the control inputs IN 1 and IN 2 perform
additional functions for operator control. With a POT Adjust
Input (line 11), a quadrature encoded signal can increase or
decrease the Speed Setpoint. Each quadrature edge causes
a change equal to the Adjust Rate (line 12). With a MOP Adjust
Input, remote Increase and Decrease contacts will change the
Speed Setpoint by the Adjust Rate amount each second.
The Ramp Rate (line 5) controls starting and stopping. When
the Run/Stop (SIG 8) is closed (to start) or opened (to stop), the
control will cause a ramp between the Speed Setpoint and zero.
The Ramp Rate is in speed units per second. For example,
stopping from a speed of 120.0 inches/sec at a rate of 5.0
inches/sec would take (120.0
+
5.0 =) 24 seconds. (If the Run/
Stop is closed or jumpered to COM, starting and stopping may
be controlled by setting the PGM DIS switch to Off and using the
Run/Pgm key.)
,
e
ramp generator: Speed Setpoint x Ramp
(On the MAXjr Speed 1: the Ramp Hold, IN 1, will stop or
prevent speed changes, including start/stop.)
Page 4
1---
r
I
I
ERROR
ALARM
~
0
-l
1
r
OUTPUT
(alarm)
L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
SIGA
(feedback)
The Full Scale Frequency (line 9) is used to generate an internal
frequency for the feedback device to match. The difference
between this and the feedback is kept in an add/subtract
counter. (Onthe MAXjrSpeed
1
:Trim Reset, IN
2,
will reset and
hold the counter at zero.)
Speed Setpoint
@
ideal frequency
=
- - - -.... - -
x F. S. Frequency
Full Scale Speed
The magnitude of the Error Counter is compared to the Error
Afarm (line 6). The Alarm output is activated when the counter
value
~
the alarm.
o
alarm:
I
±
Error Counter
I
~
Error Alarm
The Error increases when the actual speed is less than the
Speed Setpoint. Conversely, the counter is lower (or negative)
when the feedback is going faster than the desired speed. The
amount of correction applied is determined by the Error and the
Error Gain (line 4) setting.
o
correction
=
Error Count x Error Gain x
10 mv
The Actual Speed display is calibrated into speed units. The
tachometer measures the feedback frequency, and the Full
Scale Speed and Frequency determine the value displayed.
feedback frequency
o
actual speed
=
- - - - - - - -
.- ..
x Full Scare Speed \
Full Scale Frequency
I