Danfoss VLT HVAC Series Programming Manual page 87

VLT ® HVAC Drive Programming Guide
[85] SL Digital Output F
[160] No alarm
[161] Running reverse
[165] Local reference active
[166] Remote reference active
[167] Start command active
[168] Drive in hand mode
[169] Drive in auto mode
[180] Clock Fault
[181] Preventive Maintenance
[190] No-Flow
[191] Dry Pump
[192] End of Curve
[193] Sleep Mode
[194] Broken Belt
[195] Bypass Valve Control
SL Controller Action
See par.13-52
Set dig. out. F high
is executed. The input will go low whenever the Smart Logic Action [37]
out. F low
is executed.
The output is high when no alarm is present.
The output is high when the adjustable frequency drive is running counter-clockwise (the logical
product of the status bits 'running' AND 'reverse').
The output is high when par.3-13
Linked to hand auto at the same time as the LCP is in [Hand on] mode.
The output is high when par.3-13
[Auto on] mode.
The output is high when there is an active Start command (i.e., via digital input bus connection or
[Hand on] or [Auto on], and no Stop or Start command is active.
The output is high when the adjustable frequency drive is in Hand on mode (as indicated by the
LED light above [Hand on].
The output is high when the adjustable frequency drive is in Hand on mode (as indicated by the
LED light above [Auto on].
The clock function has been reset to default (2000-01-01) because of a power failure.
One or more of the preventive maintenance events programmed in par.23-10
has passed the time for the specified action in par.23-11
A no-flow situation or minimum speed situation has been detected if enabled in par.22-21
Detection and/or par.22-22 Low Speed Detection
A dry pump condition has been detected. This function must be enabled in par.22-26
Function
.
A pump running with max. speed for a period of time without reaching the set pressure has been
detected. To enable this function, see par.22-50
The adjustable frequency drive/system has set to sleep mode. See par. 22-4*.
A broken belt condition has been detected. This function must be enabled in par.22-60
Function .
The bypass valve control (Digital/Relay output in the adjustable frequency drive) is used for com-
pressor systems to unload the compressor during start-up by using a bypass valve. After the Start
command is given, the bypass valve will be open until the adjustable frequency drive reaches par.
4-11 Motor Speed Low Limit [RPM]
closed, allowing the compressor to operate normally. This procedure will not be activated again
before a new start is initiated and the adjustable frequency drive speed is zero during the receiving
Start Delay
of start signal. par.1-71
control principle:
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
. The input will go high whenever the Smart Logic Action [43]
Reference Site = [2] Local or when par.3-13
Reference Site [1] or Linked to hand/auto
Maintenance Action
.
End of Curve Function
) . After the limit has been reached the bypass valve will be
can be used in order to delay the motor start. The bypass valve
3 Parameter Description
Set dig.
Reference Site = [0]
3
[0] while the LCP is in
Maintenance Item
.
Low Power
Dry Pump
.
Broken Belt
3-63