G7 ASD Operation Manual 159
Overvoltage Stall Level
Program ⇒ Protection Parameters ⇒ 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.
Note: This feature may increase deceleration t im es.
Direct Access Number — F626
Parameter Type — Numeri cal
Factory Default — (ASD-dependent)
Changeable During Run — Yes
Minimum — 50.0
Maximum — 250.0
Units — %
Undervoltage Trip
Program ⇒ Protection Parameters ⇒ 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 active.
Settings:
Disabled
Enabled (box checked)
Direct Access Number — F627
Parameter Type — Check Box
Factory Default — Disabled
Changeable During Run — No
Undervoltage Detection Time
Program ⇒ Protection Parameters ⇒ Undervoltage/Ridethrough
This parameter sets th e time that the unde rvoltage condition mus t exist to cause
an Undervoltage trip when this function is enabled at F627.
Direct Access Number — F628
Parameter Type — Numeri cal
Factory Default — 0.03
Changeable During Run — No
Minimum — 0.00
Maximum — 10.00
Units — Seconds
Undervoltage Stall level
Program ⇒ Protection Parameters ⇒ Undervoltage/Ridethrough
This parameter sets th e low end of the DC b us voltage threshold that, once it
drops below this se tting, will activate the setting of F302 (Ridethrough Mode).
Activation may be the result of a mom entary power loss or an excessive load on
the bus voltage. Once activated, the system will attempt to main tain the bus
voltage level set here until the motor stop s.
Note: This feature may decrease deceleration times.
Direct Access Number — F629
Parameter Type — Numeri cal
Factory Default — (ASD-dependent)
Changeable During Run — Yes
Minimum — 50.00
Maximum — 100.0
Units — %
Brake Trouble Internal Timer
Program ⇒ Protection Parameters ⇒ Brake Fault Timer
This parameter is use d in conjunction with t he discrete input te rminal setting
64 [System Consistent Sequence (BA: braking answer)] (see item 64 of Tab le
8 on pg. 76 for further information on this feature).
After activating the discrete input terminal System Consistent Sequence (B:
braking release), the setting of this parameter defines a window of time in
which 1) a Braking Answer response must be received or 2) the brake must
release.
Should this timer setting expire before the Braking Answer is returned or the
brake releases, a Brake Fault is incurred. Otherwise, the brake release s and
normal motor operations resume.
Direct Access Number — F630
Parameter Type — Numeri cal
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 10.00
Units — Seconds
F626 F630