Siemens 420 manual Reference/limit frequencies, Motor control

50.00 %

3 Functions Issue 07/04

P1130 =...

P1131 =...

P1132 =...

P1133 =...

P1134 =...

P1135 =...

Rump-up initial rounding time		0.00 s	The rounding times are recommended as
(entered in s)			abrupt responses can be avoided therefore
Ramp-up final rounding time		0.00 s	reducing stress and damage to the mechanical
(entered in s)			system.
			The ramp-up and ramp-down times are
Rump-down initial rounding time		0.00 s	extended by the component of the rounding
(entered in s)			ramps.
Ramp-down final rounding time		0.00 s
(entered in s)
Rounding type		0
0	Continuous smoothing
1	Discontinuous smoothing
OFF3 ramp-down time				5.00 s

Defines ramp-down time from maximum frequency to standstill for OFF3 command.

3.5.5.12Reference/limit frequencies

P1080 =...

P1082 =...

P2000 =...

Min. frequency (entered in Hz) 0.00 Hz

Sets minimum motor frequency [Hz] at which motor will run irrespective of frequency setpoint. If the setpoint falls below the value of P1080, then the output frequency is set to P1080 taking into account the sign.

Max. frequency (entered in Hz) 50.00 Hz

Sets maximum motor frequency [Hz] at which motor will run irrespective of the frequency setpoint. If the setpoint exceeds the value P1082, then the output frequency is limited. The value set here is valid for both clockwise and anticlockwise rotation.

Reference frequency (entered in Hz) 50.00 Hz

The reference frequency in Hertz corresponds to a value of 100 %. This setting should be changed if a maximum frequency of higher than 50 Hz is required. It is automatically changed to 60 Hz if the standard 60 Hz frequency was selected using the DIP50/60 switch or P0100.

NOTE

This reference frequency effects the setpoint frequency as both the analog setpoints

(100 % P2000) as well as the frequency setpoints via USS (4000H P2000) refer to this value.

3.5.5.13Motor control

P1300 =...

P1310 =...

Control mode 0

The control type is selected using this parameter. For the "V/f characteristic" control type, the ratio between the frequency inverter output voltage and the frequency inverter output frequency is defined.

0V/f with linear

1V/f with FCC

2V/f with parabolic characteristic

3 V/f with programmable characteristic (→ P1320 – P1325)

Continuous boost (entered in %)

Voltage boost as a % relative to P0305 (rated motor current) and P0350 (stator resistance). P1310 is valid for all V/f versions (refer to P1300). At low output frequencies, the effective resistance values of the winding can no longer be neglected in order to maintain the motor flux.

MICROMASTER 420	Operating Instructions
78	6SE6400-5AA00-0BP0