Danfoss VLT HVAC Drive FC 102 Instruction Manual page 107

How to Program
22-23 No-Flow Function
Common actions for low-power detection and low-speed
detection (individual selections not possible).
Option: Function:
[0] OFF
*
[1] Sleep Mode The adjustable frequency drive enters sleep
mode and stops when a no-flow condition is
detected. See parameter group 22-4* Sleep
Mode for programming options for sleep
mode.
[2] Warning The adjustable frequency drive continues to
run but activates a no-flow warning [W92]. A
digital output or a serial communication bus
can communicate a warning to other
equipment.
[3] Alarm The adjustable frequency drive stops running
and activates a no-flow alarm [A 92]. An
adjustable frequency drive digital output or a
serial communication bus can communicate
an alarm to other equipment.
NOTICE!
Do not set parameter 14-20 Reset Mode to [13] Infinite
auto reset when parameter 22-23 No-Flow Function is set
to [3] Alarm. Doing so causes the adjustable frequency
drive to continuously cycle between running and
stopping when a no-flow condition is detected.
NOTICE!
Disable the automatic bypass function of the bypass if:
•
The adjustable frequency drive is equipped with
a constant-speed bypass with an automatic
bypass function starting the bypass if the
adjustable frequency drive experiences a
persistent alarm condition, and
•
[3] Alarm is selected as the no-flow function.
22-24 No-Flow Delay
Range: Function:
10 s [1 - 600 s] Set the time that low power/low speed must
*
stay detected to activate signal for actions. If
detection disappears before the timer runs
out, the timer is reset.
MG11F522
Instruction Manual
22-26 Dry Pump Function
Select desired action for dry pump operation.
Option:
[0] OFF
*
[1] Warning
[2] Alarm
[3] Man. Reset
Alarm
NOTICE!
To use dry pump detection:
1.
2.
NOTICE!
Do not set parameter 14-20 Reset Mode to [13] Infinite
auto reset, when parameter 22-26 Dry Pump Function is
set to [2] Alarm. Doing so causes the adjustable
frequency drive to continuously cycle between running
and stopping when a dry pump condition is detected.
NOTICE!
For adjustable frequency drives 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 dry-pump function.
22-40 Minimum Run Time
Range:
10 s
*
Danfoss A/S © 08/2014 All rights reserved.
Function:
The adjustable frequency drive continues to
run but activates a dry pump warning [W93].
An adjustable frequency drive digital output
or a serial communication bus can
communicate a warning to other equipment.
The adjustable frequency drive stops running
and activates a dry pump alarm [A93]. An
adjustable frequency drive digital output or a
serial communication bus can communicate
an alarm to other equipment.
The adjustable frequency drive stops running
and activates a dry pump alarm [A93]. An
adjustable frequency drive digital output or a
serial communication bus can communicate
an alarm to other equipment.
Enable low-power detection in
parameter 22-21 Low Power Detection.
Commission low-power detection using either
parameter group 22-3* No-flow Power Tuning
No-Flow Power Tuning, or parameter 22-20 Low
Power Auto Set-up.
Function:
[0 - 600 s] Set the desired minimum running time for
the motor after a start command (digital
input or bus) before entering sleep mode.
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