Siemens SED2 VFD NEMA Operating Instructions Manual page 37
Bypass
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Also See for SED2 VFD NEMA:
- Start-up (11 pages) ,
- Operating instructions manual (40 pages)
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9.
To start the Drive, press
"10 HZ" (or minimum speed). Verify that the direction of motor rotation is correct.
NOTE:
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10.
With correct motor rotation, manually run the drive throughout its entire operating range
while observing operation.
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11.
Determine whether the remote speed reference is a 0 to 10 Vdc or a 4 to 20 mA signal.
Connect signal wires and place analog input DIP switch in the appropriate position.
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11.
Check the signal for proper polarity. Observe if the remote speed command can
achieve the minimum and maximum speeds desired. If not, scale as required.
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13.
Set the Drive-Off-Bypass switch to OFF. When the drive is in the run mode, it will coast
to a stop.
For units with three contactors, set the Drive Test ON-OFF switch to ON. Verify that the
drive input contactor energizes.
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14.
Make additional drive application parameter settings as required and record them for
future reference.
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15.
BYPASS TEST—Be prepared to monitor rotation of the motor in bypass operation.
"Bump" the Drive-Off-Bypass switch to BYPASS and then quickly back to OFF. Check
the motor rotation.
CAUTION:
Do NOT allow the motor to operate in bypass mode unless the motor rotation is correct.
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and then
If the direction of motor rotation is wrong, turn the Drive-Off-Bypass switch
to OFF; and turn Power Off! Wait for five minutes.
Swap wires on the motor terminals (T1(u), T2(v)) or on the output terminals
of the motor overload relay. Tighten the terminal lugs, reapply power, turn
Drive-Off-Bypass switch to DRIVE, and recheck the direction of motor
rotation.
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If the drive trips on over-current during acceleration, adjust the acceleration
time rate via Parameter P1120.
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If the drive trips on over-voltage during deceleration, adjust the deceleration
time rate via Parameter P1121.
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If excessive vibration of the driven load is noted at specific input frequencies,
use Skip Frequency Parameters P1091 through P1094 to eliminate this
vibration.
(green start key). The drive will ramp up to
Startup Procedures
29
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