GE Ecomagination AF-600 FP Programming Manual page 134

Parameter Description
15 Hz, the broken-belt function (parameter AP-60 Broken
Belt Function) is performed.
AP-60 Broken Belt Function
Selects the action to be performed if the broken-belt condition is
detected.
Option: Function:
NOTICE
Do not set parameter H-04 Auto-Reset
(Times) to [13] Infinite auto reset, when
parameter AP-60 Broken Belt Function is set
to [2] Trip. Doing so causes the frequency
converter to continuously cycle between
running and stopping when a broken-belt
condition is detected.
NOTICE
For frequency converters with constant-
speed bypass.
If an automatic bypass function starts the
bypass at persistent alarm conditions,
disable the bypass's automatic bypass
function, if [2] Alarm or [3] Man. Reset
Alarm is selected as the broken-belt
function.
[0] Off
*
[1] Warning The frequency converter continues to run, but
activates a broken-belt warning (warning 95,
Broken belt). A frequency converter digital output
or a serial communication bus can communicate
a warning to other equipment.
[2] Trip The frequency converter stops running and
activates a broken-belt alarm (alarm 95, Broken
belt). A frequency converter digital output or a
serial communication bus can communicate an
alarm to other equipment.
AP-61 Broken Belt Torque
Range: Function:
10 % [0 - 100 %] Sets the broken-belt torque as a percentage
*
of the rated motor torque.
AP-62 Broken Belt Delay
Range: Function:
10 s [0 - 600 Sets the time for which the broken belt
s] conditions must be active before carrying out
the action selected in parameter AP-60 Broken
Belt Function.
DET-620D
AF-600 FP™ Programming Guide
3.19.6 AP-7# Short Cycle Protection
When controlling refrigeration compressors, often there is a
need for limiting the numbers of starts. One way to do this
is to ensure a minimum run time (time between a start
and a stop) and a minimum interval between starts.
This means that any normal stop command can be
overridden by the minimum run time function
(parameter AP-77 Minimum Run Time) and any normal start
command (start/jog/freeze) can be overridden by the
interval between starts function (parameter AP-76 Interval
between Starts).
None of the 2 functions are active if hand-on or off modes
have been activated via the keypad. If selecting hand-on
or off, the 2 timers are reset to 0, and not start counting
until Auto is pressed and an active start command applied.
AP-70 Compressor Start Max Speed [RPM]
Range:
0 RPM
*
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Function:
[0 - par. The parameter enables "High Starting Torque".
F-17 This is a function, where the Current Limit
RPM] and Torque Limit are ignored during start of
the motor. The time, from the start signal is
given until the speed exceeds the speed set
in this parameter, becomes a "start-zone"
where the current limit and motoric torque
limit is set to what is maximum possible for
the drive/motor combination. This parameter
is normally set to the same value as
parameter F-18 Motor Speed Low Limit [RPM].
When set to zero the function is inactive.
In this "starting-zone"
parameter AP-73 Starting Acceleration Time is
active instead of parameter F-07 Accel Time 1
to ensure extra acceleration during the start
and to minimize the time where the motor is
operated under the minimum speed for the
application. The time without protection from
the Current Limit and Torque Limit must not
exceed the value set in
parameter AP-72 Compressor Start Max Time to
Trip or the drive will trip with an alarm [A18]
Start Failed.
When this function is activated to get a fast
start then also parameter H-36 Trip Speed Low
[RPM] is activated to protect the application
from running below minimum motor speed
e.g. when in current limit.
This function allows high starting torque and
use of a fast starting ramp. To ensure the
build-up of a high torque during the start,
various tricks can be done through clever use
of start delay / start speed / start current.
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