Chapter 6 – Parameters
6-18
ACH 500 Programming Manual
TORQ BOOST
Automatic start current boost, which may be necessary in applications
requiring high starting torque. Automatic torque boost is active only from
0 Hz to 20 Hz or until the reference speed is reached. Torque boost is not
activated if the output frequency falls below 20 Hz while running.
Refer to IR Compensation in Group 20.4 for added torque at low speeds while
running.
TQB
Both Flying Start and Torque Boost functions are active.
2 TORQUE BOOST CUR
Sets the current that will be allowed when Torque Boost start is selected. Keep
the boost current as low as possible for the application. Setting is in actual
amps, 0.5 – 2.0 x I
N
, 1% step.
3 STOP FUNCTION
COAST
The ACH 500 AC drive stops supplying voltage immediately after stop
command is received and the motor coasts to a stop.
RAMP
Ramp deceleration as set in Group 20.3.
DC BRAKE
DC injection braking stops the motor by applying DC to the stator windings.
By using DC braking, the motor can be stopped in the shortest possible time,
outside of using a dynamic braking device.
Note: If the Run Enable input is deactivated, the ACH 500 will stop by
coasting, regardless of the Stop Function setting.
4 BRAKE CHOPPER
If a dynamic braking device is used, the Decel Limit level (voltage regulator
upper limit) can be increased by selecting
YES
for this parameter. Decel Limit
level is raised to within five percent of the Overvoltage Trip point, essentially
eliminating the Decel Limit.
5 DC HOLD
If this parameter is set to
YES
, the DC Hold feature is enabled.
