Siemens 125-3208 operating instructions Maximum Motor Frequency, Ramp-upTime

Startup Procedures

Parameter	Description			Action	Setting/
					Default
P1082	Maximum Motor Frequency	1.	Press	to advance to	Site Setting
	0 Hz to 650 Hz		parameter P1082.		Default = 50 or
					60
	Maximum motor frequency at	2.	Press	to access the
	which the motor will run		parameter values level.		(Default is
	regardless of the frequency				determined by
	setpoint. This value applies to				the setting of
	both clockwise and	3.	Press	to advance it desired	the motor
	counterclockwise rotation.		value.		frequency and
					unit of
					measurement
		4.	Press	to confirm and save	DIP switches.)
			the setting.

NOTE:

This value is limited internally to 200 Hz or five times the rated motor frequency (P0305). When P1300 is greater than or equal to 20 (control mode = vector control), the value displays via r0209 (maximum frequency).

P1120	Ramp-up Time	1.	Press	to advance to	Site Setting
	0s to 650s		parameter P1120.		Default = 10
		2.	Press	to access the	Typical fan =
			parameter values level.		120s
		3.	Press	to advance it desired	Typical pump =
					30s
			value.
		4.	Press	to confirm and save
			the setting.

NOTES:

1. Setting the ramp-up time too short can cause the SED2 to trip (F0001 over current, F0002 over voltage, or F0003 under voltage).

2. If using an external frequency setpoint with set ramp rates (such as from a PLC), achieve optimum SED2 performance by setting ramp time (P1120 and P1121) slightly shorter than those of the PLC.

Siemens Building Technologies, Inc. 29