Siemens 125-3208 operating instructions Ramp-down time, End Quick Commissioning

SED2 VFD Electronic Bypass Option Operating Instructions

Parameter	Description			Action	Setting/
					Default
P1121	Ramp-down time	1.	Press	to advance to	Site Setting
	0s to 650s		parameter P1121.		Default = 30
		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 times (P1120 and P1121) slightly shorter than those of the PLC.

P3900	End Quick Commissioning	1.	Press	to advance to	Setting = 1
	0 = End without motor calculation		parameter P3900.		Default = 0
	or factory reset.
	1 = End with motor calculation	2.	Press	to access the
			parameter values level.
	and factory reset (recommended
	on SED2 without bypass option).	3.	Press	to advance to 1.
	2 = End with motor calculation
	and with I/O reset.	4.	Press	to confirm the
	3 = End with motor calculation		setting.
	but without I/O reset
	(recommended with SED2 with
	bypass option).

NOTES:

1. P0010 must always be set back to 0 before operating the motor.

2. If P3900 is greater than 0 on completion of commissioning, P0010 is automatically set back to 0.

3. If P0700 either indeed was changed during this process, programming of P0704 = 3 is required.

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