ITT Industries PumpSmart PS200, Руководство по конфигурации и эксплуатации

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PS200 Configuration & Operation Guide
SPEED CONTROL CONFIGURATION
Page 62
DRIVE OPERATION LIMITS
Drive operation limits safe-guard the pump and drive system
from operating in unstable over-speed and/or low-speed
conditions.
Maximum Speed
- The PumpSmart System will adjust the
speed of the motor to achieve the desired speed setpoint.
Although the PumpSmart drive can drive the motor to 2-3
times its nameplate speed, this is impractical for several
reasons. First, unless the pump and motor are designed for
overspeed operation, they could prematurely wear or even
catastrophically fail. Second, centrifugal pumps generate
pressure by the square of the speed and overspeed operation
may overpressure the pump and surrounding piping system.
The maximum speed setting should never be set over the
full load RPM of the motor or the pump manufacturers
stated maximum speed of the pump.
14.01 MAXIMUM SPEED
KEY SEQUENCE
[From parameter group: 11 START-UP
DATA]
OR
Scroll to parameter
group14, SPD LIM/STRT
LVL. Parameter 14.01 will
be the first selection.
ENTER
Press to enter the
parameter setting mode
OR
OR
Use a combination of the
arrow keys to scroll to the
maximum speed.
Enter the maximum
speed that the pump,
motor, and system, can
operate at. In most
cases, the maximum
speed will be the same
as the previously entered
full load RPM.
MAX SPEED
d
Nominal
Motor RPM
and
d Pump
maximum
speed
The default value is the
speed set in parameter
11.07 MOTOR FL RPM
ENTER
Press to complete the
entry
Minimum Speed - The Minimum Speed parameter sets the
minimum speed that the pump can operate at. It is also used
to define the safe speed to run the pump during a secondary
pump protection fault if the pump protection is programmed
this way. The default value for minimum speed is 25% of
11.07 MOTOR FL RPM
When determining a minimum speed, consider the following:
x Motor Minimum Speed [Turndown ratio] - Due to
motor loading and thermal effects, the motor
minimum speed on centrifugal pumps should not be
less than 1/10
th
its full-load speed
Example – if full load rpm = 3550, set min speed to
355. Use greater than 10% if either of the following
conditions exist:
ACT PAR FUNC DRIVE
ENTER
1 L
Æ
0 R P M 0
1 4 S P D L I M / S T R T L V L
1 M A X I M U M S P E E D
3550