PDL MICRODRIVE Series User Manual

Microdrive Series Instruction Manual
4201-109 Rev I
102
4D: APPLICATION EXAMPLE -
CONSTANT PRESSURE PUMPING WITH
AUTOMATIC STOP/START CONTROL
Using Microdrive features the user can arrange to automatically
stop a pump/motor for a period of no demand. Upper and lower
pressure limits determine the turn off and the turn on point.
The start/stop input is wired up in such a way that the start/stop
button and the feedback sense relay output are in series (to turn
the Microdrive off when running on low demand).
EXAMPLE OF OPERATION OF CONSTANT PRESSURE PUMP
EXAMPLE: OPERATION OF CONSTANT
POINT
LEVEL
HYSTERESIS
LOWER
PRESSURE
(PRESSURE)
SET
LEVEL
HYSTERESIS
UPPER
P
4807−248 Rev B
High flow
SMin
PRESSURE PUMP
No flow
Low flow
(PUMP SPEED)
S
The corresponding process parameters of the Microdrive
setup are:
Setpoint pressure = reference frequency level
Upper - lower pressure limit = feedback sense hysteresis
(54 FB RLY)
Minimum speed (25 Hz) = minimum output frequency
Fmin
(21 MIN FR)
The example given is of a system of the following specification:
Control signal 010V (potentiometer)
Pressure sensor 420mA, 100psi,
12V supply, 3 wire
Motor 132 kW, 245A, 380V,
1485 rpm
Microdrive model 250
Stop/Start Control 2 wire
Direction control reverse inhibited
The configuration table (not including irrelevant and/or settings
which have not been altered from factory set values) and
wiring configurations follow.
CONSTANT PRESSURE PUMPING EXAMPLE
CONFIGURATION TABLE
DRIVE NO: _________ MODEL:____UDi-250____
SITUATION: Constant Pressure Pump - Auto Stop/Start_
MOTOR kW: _132__ A:_245_ V:_380_
POLES:____4____ RPM:__1485____
ADJUSTMENTS
Adjustment 10 MTR CUR
(Default) (= I Inv.)
Setting 245A
Notes Motor nameplate value.
Adjustment 11 MTR VOLT
(Default) (= 415V)
Setting 380
Notes Motor nameplate value.
Adjustment 15 ACC1
(Default) (= 10.0Hz/s)
Setting 5.0
Notes Slower to limit current required to accelerate.
Adjustment 16 DEC1
(Default) (= 10.0Hz/s)
Setting 3.0
Notes Slower to limit current required to decelerate
pump and to prevent regeneration (VLT).
Adjustment 17 T CONST
(Default) (= 0.05s)
Setting 0.1
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 25.0
Notes Sets minimum output frequency.
Adjustment 22 MAX FR
(Default) (= 60Hz)
Setting 50.0
Notes Reduced to 50Hz to avoid overspeed/overload
of pump/motor.
Adjustment 23 FR F1
(Default) (= +0.0Hz)
Setting 0.0
Notes In feedback applications FR F1 should generally
be set equal to the minimum frequency, MIN FR.
Adjustment 24 FR F2
(Default) (= +60.0Hz)
Setting 50.0
Notes In feedback applications FR F2 should generally
be set to equal the maximum frequency, MAX
FR.

PDL MICRODRIVE Series Specifications

General

Brand	PDL
Model	MICRODRIVE Series
Category	Controller
Language	English