Frequency Input And Output; Zero Speed Threshold/At Speed Window; Frequency Output Or Pwm Output Scaling; Maximum Output Frequency Or Maximum Pwm Output Frequency - Emerson 2202 Advanced User's Manual

Parameter
Menu 3 Introduction
x.00

Frequency input and output

The frequency input is used as a speed reference. In some applications, a frequency input from a controller is used in preference to a 0 to +10V or 4
to 20mA signal.
This frequency input is converted into a frequency reference percentage (Pr 3.45) and this percentage value is used to provide the speed reference
(as Pr 7.01 and Pr 7.02 in Menu 7).
This frequency input cannot be used for frequency slaving.
The frequency input and output are not 'locked' together or synchronised within the drive. The frequency input is used as a speed reference and from
this input, the software calculates the correct frequency to put on to the output. The threshold is 10V for a frequency input.
3.01 to 3.04 Unused parameters
3.05 Zero speed threshold
Bit SP
Coding
Range 0.0 to 20.0 Hz
Default 1.0
Update rate Background read
If the post ramp reference (Pr 2.01) is at or below the level defined by this parameter in either direction the Zero speed flag (Pr 10.03) is On(1),
otherwise the flag is OFF(0).
3.06 At speed window
Bit SP
Coding
Range 0.0 to 20.0 Hz
Default 1.0
Update rate Background read
This parameter defines the 'At speed' window which is the boundary around the set speed point in which an 'At speed' indication is given (Pr 10.06 =
On(1). The 'At speed' window is thus defined as Set speed ±(Pr 3.06 / 2).
The speed detector system also includes an overspeed trip. The level cannot be set by the user, but the drive produces an overspeed trip if the output
frequency (Pr 5.01) exceeds 1.2 x Maximum frequency and regenerating and in current limit.
3.07 to 3.16 Unused parameters
3.17

Frequency output or PWM output scaling

Bit SP
Coding
Range 0.000 to 4.000
Default 1.000
Update rate Background read
Scale factor applied to the frequency or PWM output.
3.18

Maximum output frequency or maximum PWM output frequency

Bit SP
Coding
Range 1, 2, 5 and 10kHz (0 to 3)
Default 5(2)
Update rate Background
Defines the maximum frequency required at the frequency/PWM output. The choice of maximum output frequency depends on the requirement of the
output. Due to limitations in the hardware, higher output frequencies do not offer the best resolution at the top end of the frequency range.
Fmax (kHz)
Pr 3.18
(On display)
0 1
1 2
2 5
3 10
58
Parameter Keypad and
description format display
FI DE Txt VM DP ND
1
FI DE Txt VM DP ND
1
FI DE Txt VM DP ND
3
FI DE Txt VM DP ND
Resolution at Fmax
10 bit
9
8
7
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Serial CT Modbus PLC Ladder
communications RTU programming
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Advanced parameter
CTSoft Menu 0
PS
1
PS
1
PS
1
PS
1
Commander SK Advanced User Guide
Issue Number: 9
descriptions