PDL MICRODRIVE-3 User Manual

Microdrive Series Instruction Manual
4201-109 Rev I
99
APPENDIX 4: USING THE MICRODRIVE AS A PROCESS CONTROLLER
4A: GENERAL NOTES
The process controller in the Microdrive is intended for simple
processes with minimal lag time. While it should not be
considered as a replacement for a high performance controller,
it is well suited to simple tasks such as pressure control and
provides accurate tacho feedback.
There is a good deal of flexibility in selecting the input reference
and the feedback source (Screens 64, 65). Many alternatives
may be selected, e.g.,
Reference 010V
Feedback 420mA
Notes Typical with manual (potentiometer) adjustment
and current (mA) feedback sensor.
Reference Keyboard
Feedback 010V
Notes Keyboard reference level with 010V
feedback level.
Reference 420mA
Feedback Tacho
Notes Tacho feedback using a current input as a
reference.
Notes: Setting both reference and feedback to the
same source is an illegal condition.
Since there is no adjustment for the gain of the feedback
sensor (except a tacho sensor) or offset, the sensor output
will represent the range of control of the control system. You
must choose a sensor with the range of control you require,
e.g., for a nominal 60psi pressure system, choose a 0
100psi = 420mA transducer; the range of control will then
be 0100psi.
4B: APPLICATION EXAMPLE -
TACHO FEEDBACK
Tacho feedback is used where precision regulation of speed
is required. This section shows the configuration, wiring and
adjustment of a typical example.
System specification:
Control signal 420mA
Speed range 501500 rpm
Motor 132kW, 245A,
380V, 1485 rpm
Sensor 1000 ppr encoder
on motor shaft
Microdrive model 250
Stop/start control 3 wire
The configuration table (not including irrelevant and/or settings
which have not been altered from factory set values) and
wiring configurations follow:
TACHO FEEDBACK EXAMPLE CONFIGURATION TABLE
DRIVE NO: _________ MODEL:__UDi-250____
SITUATION: _Tacho Controller______________________
MOTOR kW: _132__ A:_245_ V:_380_
POLES:____4____ RPM:__1485____
ADJUSTMENTS
Adjustment 10 MTR CUR
(Default ) (= I Inv.)
Setting 245
Notes Motor nameplate value.
Adjustment 11 MTR VOLT
(Default) (=415V)
Setting 380
Notes Motor nameplate value.
Adjustment 17 T CONST
(Default) (= 0.05s)
Setting 0.4
Notes Value set by experiment - increasing value
improves stability but slows response. Adjust
to achieve good response without instability.
Adjustment 21 MIN FR
(Default) (= 0.0Hz)
Setting 0.0
Notes Sets minimum output frequency.
Adjustment 22 MAX FR
(Default) (= 60Hz)
Setting 60.0
Notes Sets maximum possible output frequency
(hence speed range exceeds required
specification).
Adjustment 23 FR F1
(Default) (= +0.0Hz)
Setting 0.0
Notes Set to equal MIN FR.

PDL MICRODRIVE-3 Specifications

General

Brand	PDL
Model	MICRODRIVE-3
Category	Controller
Language	English