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22-61 Broken Belt Torque
Range:
Function:
10 %*
[0 - 100 %]
Sets the broken belt torque as a percentage of the rated motor torque.
22-62 Broken Belt Delay
Range:
Function:
10 s
[0 - 600 s]
Sets the time for which the Broken Belt conditions must be active before carrying out the action
selected in par.22-60
2.19.7 22-7* Short Cycle Protection
In some applications, there will often be 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 (par. 22-77) and any normal start command (Start/
Jog/Freeze) can be overridden by the
Interval Between Starts
function (par. 22-76).
None of the two functions are active if
Hand On
or
Off
modes have been activated via the LCP. If selecting
Hand On
or
Off
, the two timers will be reset
to 0, and not start counting until
Auto
is pressed and an active start command applied.
22-75 Short Cycle Protection
Option:
Function:
[0] *
Disabled
Timer set in par.22-76
is disabled.
[1]
Enabled
Timer set in par.22-76
is enabled.
22-76 Interval between Starts
Range:
Function:
par. 22-77
s*
[par. 22-77 - 3600 s]
Sets the time desired as minimum time between two starts. Any normal start command (Start/Jog/
Freeze) will be disregarded until the timer has expired.
22-77 Minimum Run Time
Range:
Function:
0 s*
[0 - par. 22-76 s]
Sets the time desired as minimum run time after a normal start command (Start/Jog/Freeze). Any
normal stop command will be disregarded until the set time has expired. The timer will start counting
following a normal start command (Start/Jog/Freeze).
The timer will be overridden by a Coast (Inverse) or an External Interlock command.
NB!
Does not work in cascade mode.
2.19.8 Flow Compensation, 22-8*
It is sometimes the case that 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 set-point according to the output frequency, which is almost proportional to flow, thus
compensating for higher losses at higher flow rates.
H
DESIGN
(Required pressure) is the setpoint for closed loop (PI) operation of the frequency converter and is set as for closed loop operation without flow
compensation.
VLT
®
AQUA Drive Programming Guide
2 Parameter Description
MG.20.O4.02 - VLT
®
is a registered Danfoss trademark
193
2