Delta VFD-E User Manual

Chapter 4 Parameters|
Revision Jan. 2009, 06EE, SW--PW V1.12/CTL V2.12 4-161
integral time is short, it will have large gain of I controller, the faster response and rapid
external control.
 When the integral time is too small, it may cause system oscillation.
 When it is set to 0.0, the integral function is disabled.
 Related parameter: Pr.10.05(Upper Bound for Integral Control)
10.04 Differential Control (D) Unit: 0.01
Settings 0.00 to 1.00 sec Factory Setting: 0.00
 The differential controller is used to show the change of system error and it is helpful to
preview the change of error. So the differential controller can be used to eliminate the error to
improve system state. With the suitable differential time, it can reduce overshoot and shorten
adjustment time. However, the differential operation will increase the noise interference.
Please note that too large differential will cause big noise interference. Besides, the differential
shows the change and the output of the differential will be 0 when there is no change.
Therefore, the differential control can’t be used independently. It needs to be used with other
two controllers to make a PD controller or PID controller.
 This parameter can be used to set the gain of D controller to decide the response of error
change. The suitable differential time can reduce the overshoot of P and I controller to
decrease the oscillation and have a stable system. But too long differential time may cause
system oscillation.
 The differential controller acts for the change of error and can’t reduce the interference. It is
not recommended to use this function in the serious interference.
10.05
Upper Bound for Integral Control
Unit: 1
Settings
0 to 100 %
Factory Setting: 100
 This parameter defines an upper bound or limit for the integral gain (I) and therefore limits the
Master Frequency. The formula is: Integral upper bound = Maximum Output Frequency
(Pr.01.00) x (Pr.10.05).
 Too large integral value will make the slow response due to sudden load change. In this way, it
may cause motor stall or machine damage.
 Related parameter: Pr.01.00(Maximum Output Frequency (Fmax))

Delta VFD-E Specifications

General

Protection Features	IP20
Enclosure Rating	IP20
Overload Capacity	150% for 60 seconds
Braking Unit	Built-in
Control Mode	V/F, Sensorless Vector
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Overheating, Short Circuit
Operating Temperature	-10°C to +50°C
Analog Inputs	2 (0-10V, 4-20mA)
Analog Outputs	1 (0-10V)
Communication Interface	RS-485
Output Voltage	3-phase, equal to input voltage
Power Range	0.4kW to 7.5 kW
Storage Temperature	-20°C to +60°C
Humidity	90% RH (non-condensing)
Cooling Method	Fan cooled
Digital Outputs	1 relay output