Siemens SED2 VFD Electronic Bypass Option 125-3208 - Manual (Page 38)

SED2 VFD Electronic Bypass Option Operating Instructions
30 Siemens Building Technologies, Inc.
Parameter Description Action
Setting/
Default
P1121 Ramp-down time
0s to 650s
1. Press to advance to
parameter P1121.
2. Press to access the
parameter values level.
3. Press to advance it desired
value.
4. Press to confirm and save
the setting.
Site Setting
Default = 30
Typical fan =
120s
Typical pump =
30s
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
0 = End without motor calculation
or factory reset.
1 = End with motor calculation
and factory reset (recommended
on SED2 without bypass option).
2 = End with motor calculation
and with I/O reset.
3 = End with motor calculation
but without I/O reset
(recommended with SED2 with
bypass option).
1. Press to advance to
parameter P3900.
2. Press to access the
parameter values level.
3. Press to advance to 1.
4. Press to confirm the
setting.
Setting = 1
Default = 0
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.