Reliance electric GV3000SE, Instruction Manual

Page: 167 / 198

6 - VECTOR REGULATION MODE
49'1329 e GV3000/SE 6 - 17
U.025 Zero Speed Hold Time
Parameter Range: 0.0 to 655.0 seconds
Default Setting: 0.0
Parameter Type: Tunable (at rest or during operation)
Description: This parameter selects the amount of time for which zero speed is held at the end
of a ramp stop sequence.
WARNING: The motor is energized when the drive is operating at zero speed. The
user is responsible for ensuring safe conditions for operating personnel by
providing suitable guards, audible or visual alarms, or other devices to indicate
that the drive is operating at zero speed. Failure to observe this precaution could
result in severe bodily injury or loss of life.
This feature provides the capability to hold the motor at zero speed at the end of a
ramp stop for a user-specified amount of time (U.025). During the zero speed hold
time period, the running status indicator remains on.
For FVC operation, a zero speed reference is applied for the time specified in
U.025, regulating torque based on load. Note that this will override the Minimum
Speed setting (P.003).
For SVC operation, magnetizing current is applied for the time specified in U.025.
U.026 Current Compounding Gain
Parameter Range: 0.0 to 1.000
Default Setting: 0.0 (Current compounding disabled)
Parameter Type: Tunable (at rest or during operation)
Refer to: U.027 Inertia Compensation Gain U.028 Losses Compensation Gain
Description: This parameter specifies the gain applied to the speed PI output. This is used to
generate the current compounding signal that is subtracted from the speed loop
reference.
Refer to the speed loop block diagram, figure 6-1a
U.027 Inertia Compensation Gain
Parameter Range: 0.0 to 5.000
Default Setting: 0.0 (Disable inertia compensation)
Parameter Type: Tunable (at rest or during operation)
Refer to: U.026 Current Compounding Gain U.028 Losses Compensation Gain
Description: This parameter specifies the gain applied to the selected inertia compensation source
signal to produce the inertia compensation signal. The result is added to the speed PI
output to produce the torque reference signal.
The inertia compensation signal can be either the S/Ramp (ramp) block rate output (dv/dt), used
for standalone applications, or a value provided directly from the network option. Signal selection
is controlled by a network register. No corresponding parameter local to the drive is provided.
Inertia compensation can be used with or without an option board installed in the drive. If a
network option board is not installed, network inertia compensation is not enabled, the network is
not active or is not the control source (P.000
≠
OP
),
inertia compensation is supplied from the
S/Ramp block rate output. The signal provided from the network for inertia compensation is
typically used to compensate for inertia as well as all system losses.
Note that if the selected torque reference is not the speed loop output, then the inertia
compensation circuit does not apply. Refer to the speed loop block diagram Figure 6-1a.