E-Tech DrivE-Tech 015 Installing And Operating Manual page 22

Min motor freq.
f = XXX [Hz]
Ramp up time
t = XX [sec]
Ramp down time
t = XX [sec]
Ramp f min mot.
t = XX [sec]
Freq.
Ramp f min mot.
0
PWM
f = XX [kHz ]
V/f lin. --> quad.
XXX %
22
30 Minimum frequency of the motor. Note: depends on the selected pump
type; for submersible pumps with water filled motors, is not advisable to set
minimum frequency lower than 30 Hz in order to protect the integrity of the
thrust bearings.
4 Ramp-up time to reach the speed required to achieve the set pressure (or
frequency value). Longer times delay the system reaching the preset value
but better protect system components.
Excessively long ramp-up times can create difficulties in DrivE-Tech setup,
and can also cause false overload alarms.
4 Ramp-down time to reach zero speed. Longer times keep the system
pressurized, while protecting the system components.
Excessively long ramp-down times can create difficulties in DrivE-Tech setup.
Excessively short ramp-down times can cause false overload alarms.
1.5 Time to reach the minimum frequency of the motor and vice versa.
When DrivE-Tech is used to control a water filled submersible motor it's
important to keep this time at 1 second.
PI Control
Ramp up time
Min. motor. freq.
8 Carrier frequency (switching frequency).
It is possible to chose PWM in the range of 2.5 ,4, 6, 8, 10 kHz .
Higher values give a more sinusoidal wave with fewer losses. If long cables
are used (>20 m / >76 ft) (submersible pump) it is recommended to install an
inductive filter between DrivE-Tech and the motor (available upon request)
and to set the value of PWM to 2.5 kHz. This reduces the risk of voltage
spikes, which can damage motor and cable insulation.
85 % This parameter allows you to change the V / f characteristic with which
DrivE-Tech feeds the engine. The linear characteristic corresponds to
constant torque with variable speed. The quadratic characteristic is normally
used with centrifugal pumps. The selection of torque characteristic should
be done ensuring a smooth operation, a reduction of energy consumption
and a lower level of heat and acoustic noise. When feeding singlephase
motors it's suggested to set V/f as linear (0%).
Ramp down time
Stop delay
Control ramp
Ramp f min mot.
Max motor freq.
Freq.min.control
Sec.