Danfoss VLT HVAC Series, Programming Manual, Page: 242 / 338

23-12 Maintenance Time Base
Option: Function:
Select the time base to be associated with the preventive maintenance event.
[0] * Disabled Disabled [0] must be used when disabling the preventive maintenance event.
[1] Running Hours
Running Hours
[1] is the number of hours the motor has been running. Running hours are not reset
at power-on. The
Maintenance Time Interval
must be specified in par.23-13
Maintenance Time
Interval
.
[2] Operating Hours Operating Hours [2] is the number of hours the adjustable frequency drive has been running. Op-
erating hours are not reset at power-on. The Maintenance Time Interval must be specified in par.
23-13 Maintenance Time Interval .
[3] Date & Time
Date & Time
[3] uses the internal clock. The date and time of the next maintenance occurrence
must be specified in par.23-14
Maintenance Date and Time
.
23-13 Maintenance Time Interval
Range: Function:
1 h* [1 - 2147483647 h] Set the interval associated with the current preventive maintenance event. This parameter is only
used if
Running Hours [1] or Operating Hours [2] is selected in par.23-12 Maintenance Time Base .
The timer is reset from par.23-15 Reset Maintenance Word .
Example:
A preventive maintenance event is set up for Monday at 8:00. par.23-12
Maintenance Time Base
is
Operating hours
[2] and par.23-13
Maintenance Time Interval
is 7 x 24 hours=168 hours. The next
maintenance event will be indicated the following Monday at 8:00. If this maintenance event is not
reset until Tuesday at 9:00, the next occurrence will be the following Tuesday at 9:00.
23-14 Maintenance Date and Time
Range: Function:
0 N/A* [0 - 0 N/A] Set the date and time for next maintenance occurrence if the preventive maintenance event is based
on date/time. The date format depends on the setting in par.0-71
Date Format while the time format
depends on the setting in par.0-72 Time Format .
NOTE!
The adjustable frequency drive has no back-up of the clock function and the set
date/time will reset to default (2000-01-01 00:00) after a power-down. In par.
0-79
Clock Fault
, it is possible to program for a warning in case the clock has not
been set properly, e.g., after a power-down.
The time set must be at least one hour from the current time!
NOTE!
When mounting an Analog I/O MCB109 option card, a battery back-up of the date
and time is included.
3 Parameter Description VLT ® HVAC Drive Programming Guide
3-218
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
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