H9 ASD Installation and Operation Manual 187

Abnormal Speed Detection Time

Program ⇒ Protection ⇒ Abnormal Speed Settings
This parameter sets th e time that an oversp eed condition must ex ist to cause a
trip.
This parameter functions in conjunction with the settings of F623 and F624.
Direct Access Number — F622
Parameter Type — Numeri cal
Factory Default — 0.01
Changeable During Run — Yes
Minimum — 0.01
Maximum — 100.00
Units — Seconds

Over-speed Detection Frequency Upper Band

Program ⇒ Protection ⇒ Abnormal Speed Settings
This parameter sets th e upper level of the Base Frequency range that, once
exceeded, will cause an Overspeed Detected alert.
This parameter functions in conjunction with the settings of F622 and F624.
Direct Access Number — F623
Parameter Type — Numeri cal
Factory Default — 0.0 (Disabled)
Changeable During Run — Yes
Minimum — 0.0 (Disabled)
Maximum — 30.00
Units — Hz

Over-speed Detection Frequency Lower Band

Program ⇒ Protection ⇒ Abnormal Speed Settings
This parameter sets th e lower level of the Base Frequency range that, on c e th e
output speed falls below this setting, will cause a Speed Drop Detected alert.
This parameter functions in conjunction with the settings of F622 and F623.
Direct Access Number — F624
Parameter Type — Numeri cal
Factory Default — 0.00 (Disabled)
Changeable During Run — Yes
Minimum — 0.00 (Disabled)
Maximum — 30.00
Units — Hz

Overvoltage Limit Operation Level

Program ⇒ Protection ⇒ Stall
This parameter sets the upper DC bus voltage threshold that, once exceeded,
will cause an Overvoltage Stall. An Overvoltage Stall increases the output
frequency of the drive during deceleration for a specified time in an attempt to
prevent an Overvoltage Trip.
If the overvoltage condition persists for over 4 mS, an Overvoltage Trip will
be incurred.
This parameter is ena bled at F305.
Note: This parameter setting may in crease deceleration times.
Direct Access Number — F626
Parameter Type — Numeri cal
Factory Default — (ASD-dependent)
Changeable During Run — Yes
Minimum — 100
Maximum — 150
Units — %

Undervoltage Trip

Program ⇒ Protection ⇒ Undervoltage/Ridethrough
This parameter Enables/Disables the Undervoltage Trip function.
With this parameter Enabled, the ASD will trip if the undervoltage condition
persists for a time greater than the F628 setting.
A user-selected contact may be actuated if so configured.
If Disabled the ASD will stop and not trip; the FL contact is not activated.
Settings:
0 — Disabled
1 — Enabled
Direct Access Number — F627
Parameter Type — Selection List
Factory Default — Disabled
Changeable During Run — No
F622 F627