Siemens Simovert P 6SE21 Series Operating Instructions Manual page 23

SIMOVERT P 6SE21 Series Inverters
Parameter Description
Number
P15 Voltage to frequency relationship:
'knee point' (Hz)
P16 Voltage to frequency relationship:
curve type
P17 Current limit (A)
P18 Overload limit
P19 Automatic boost
Siemens plc 1995
Display
Setting Notes
(Default)
00.1 – Sets the knee frequency on a user–defined curve. Used when P06 is
400 set to 006.
(50.0)
[60.0]
000 Linear from 0 Hz to knee frequency when P06 is set to 006.
001 Voltage proportional to (frequency)
(000)
00.1 – This parameter sets the current limit of the inverter in amperes. This
inverter current limit operates after 60 s (P18 sets the overload limit) by
rated reducing the output frequency until the output current falls below the set
output in value. The display flashes when the current set by P17 is exceeded or
Amperes when the current limit is active.
(1.1 x
inverter
rating)
01.0 – This parameter sets the overload limit used during automatic boost and
03.0 overload current limit operation. The current limit (set in P17) may be
exceeded for up to 60 s, providing the current does not exceed P17 x
P18. If this occurs, or in any case after 60 s, the output frequency is
reduced until the current falls below the value of P17.
The overload limit is also used during automatic boost operation.
(01.5)
000 – Automatic Boost Operation
003 Automatic boost is enabled when P19 is set to 001 or 003. For correct
operation, set P17 to the nominal motor current as stated on the rating
plate. The next time the inverter is run after P19 has been set to 001 or
003, the inverter measures the motor resistance and uses this value to
calculate the required boost. This value is written to parameter P01,
where it may be read but not changed. During the calculation period
(lasts a few seconds), 'CAL' is indicated on the display. The inverter
then starts and runs normally.
The inverter can provide additional boost during ramp–up by setting
P19 to 002 or 003. In these cases boost operates as normal (i.e.
manually or automatically derived) when the inverter is running, but
during ramp–up the boost percentage is increased by the factor P18 to
provide additional torque during ramp–up. The boost reverts to that
defined by P01 when the setpoint is reached.
000 Manual boost setting, no additional boost.
001 Automatic boost setting, no additional boost.
002 Manual boost setting, additional boost on ramp–up.
003 Automatic boost setting, additional boost on ramp–up.
(000)
English
Operating Instructions
1.5
when P06 is set to 006.
G85139–A1615–U156–A
02.95
25