Emotron FDU Series, Инструкция по эксплуатации, Страница: 134 / 260

130 Functional description CG Drives & Automation 01-7491-01r0
Release Speed [33D]
The release speed only operates with the brake function:
brake release [33C]. The release speed is the initial speed
reference during the brake release time.
Brake Engage Time [33E]
The brake engage time is the time the load is held while the
mechanical brake engages. It is also used to get a firm stop
when transmissions, etc. cause “whiplash” effects. In other
words, it compensates for the time it takes to engage a
mechanical brake.
Wait Before Brake Time [33F]
The brake wait time is the time to keep brake open and to
hold the load, either in order to be able to speed up
immediately, or to stop and engage the brake.
Vector Brake [33G]
Braking by increasing the internal electrical losses in the
motor.
Brake Fault trip time [33H]
The “Brake Fault trip time” for “Brake not released”
function is specified in this menu.
The “Brake not engaged” warning is using the setting of
parameter “Brake Engaged time [33E]”.
Fig. 108 shows principle of brake operation for fault during
run (left) and during stop (right).
Release torque [33I]
The Brake Release Time [33C] sets the time the AC drive
delays before ramping up to whatever final speed reference
value is selected, to allow the brake to be fully opened.
During this time a holding torque to prevent roll-back of the
load can be activated. The parameter Release Torque [33I] is
used for this purpose.
The release torque initiates the torque reference from the
speed controller during the Brake Release Time [33C]. The
release torque defines a minimum level of release (holding)
torque. The set release torque is internally overruled if the
actual required holding torque measured at the previous
closing of brake is higher.
The release torque is set with sign in order to define the
holding torque direction.
33D Release Spd
Default: 0 rpm
Range: - 4x Sync. Speed to 4x Sync.
Depend on:
4xmotor sync speed, 1500 rpm for 1470
rpm motor.
NOTE: Speed signal is limited to < 32767.
33E Brk Engage
Default: 0.00 s
Range: 0.00–3.00 s
33F Brk Wait
Default: 0.00 s
Range: 0.00–30.0 s
33G Vector Brake
Default: Off
Off 0
Vector brake switched off. AC drive brakes
normal with voltage limit on the DC link.
On 1
Maximum AC drive current (I
CL
) is available
for braking.
33H Brk Fault
Default: 1.00s
Range 0.00 - 5.00s
Note: The Brake Fault trip time should be set to
longer time than the Brake release time[33C].
33I Release Trq
Default: 0%
Range -400% to 400%
Note! Function is deactivated if set to 0%.
Note! Release Torque [33I] has priority over torque
reference initialization by Release Speed [33D].