GE Ecomagination AF-600 FP Programming Manual page 135

Parameter Description
AP-71 Compressor Start Max Speed [Hz]
Range:
0 [0 -
Hz par.
*
F-15
3 3
Hz]
AP-72 Compressor Start Max Time to Trip
Range: Function:
NOTICE
5 s [0 -
*
10 s]
Parameter AP-72 Compressor Start Max Time
to Trip has no effect when
parameter P-20 Motor Construction = [1] PM,
non-salient SPM.
The time from the start signal is given, until the
speed exceeds the speed set in
parameter AP-70 Compressor Start Max Speed [RPM]
must not exceed the time set in the parameter. If
the time set is exceeded, the frequency converter
trips with alarm 18, Start failed.
134
Function:
NOTICE
Parameter AP-71 Compressor Start Max
Speed [Hz] has no effect when
parameter P-20 Motor Construction = [1] PM,
non-salient SPM.
The parameter enables high starting torque. This is
a function, where the current limit 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 frequency converter/motor combination. This
parameter is normally set to the same value as
parameter F-18 Motor Speed Low Limit [RPM]. When
set to 0, 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.
If the value of parameter AP-72 Compressor Start
Max Time to Trip is exceeded, the frequency
converter trips with alarm 18 Start failed.
When this function is activated to get a fast start,
parameter H-36 Trip Speed Low [RPM] is also
activated to protect the application from running
below minimum motor speed, for example 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, enter appropriate
values for start delay/start speed/start current.
AP-72 Compressor Start Max Time to Trip
Range:
AP-73 Starting Acceleration Time
Range:
20.00 s
*
AP-75 Short Cycle Protection
Option:
[0] Disabled Timer set in parameter AP-76 Interval between
*
[1] Enabled Timer set in parameter AP-76 Interval between
AP-76 Interval between Starts
Range:
par. AP-77
s
*
AP-77 Minimum Run Time
Range:
0 s [0 - par.
*
AP-76 s]
3.19.7 AP-8# Flow Compensation
It is sometimes the case that it is not possible for a
pressure transducer to be placed at a remote point in the
system and it can only be located close to the fan/pump
outlet. Flow compensation operates by adjusting the
setpoint according to the output frequency, which is
almost proportional to flow, thus compensating for higher
losses at higher flow rates.
H (required pressure) is the setpoint for closed loop
DESIGN
(PI) operation of the frequency converter and is set as for
closed-loop operation without flow compensation.
It is recommended to use slip compensation and RPM as
unit.
03/2016 All rights reserved.
Function:
Any time set in parameter F-24 Holding Time for use
of a start function must be executed within the time
limit.
[0.01 - 3600 s]
Function:
Starts is disabled.
Starts is enabled.
Function:
[par. AP-77 - Sets the minimum time between 2
3600 s] starts. Any normal start command
(start/jog/freeze) is disregarded
until the timer has expired.
Function:
NOTICE
Does not work in cascade mode.
Sets the minimum run time after a normal start
command (start/jog/freeze). Any normal stop
command is disregarded until the set time has
expired. The timer starts counting following a
normal start command (start/jog/freeze).
A coast (inverse) or an external interlock
command overrides the timer.
Function:
DET-620D