ABB RELION 620 Series Technical Manual page 912

Section 6
Supervision functions
6.6.3
6.6.4
906
Functionality
The runtime counter for machines and devices function MDSOPT calculates and
presents the accumulated operation time of a machine or device as the output. The unit
of time for accumulation is hour. The function generates a warning and an alarm when
the accumulated operation time exceeds the set limits. It utilizes a binary input to
indicate the active operation condition.
The accumulated operation time is one of the parameters for scheduling a service on
the equipment like motors. It indicates the use of the machine and hence the
mechanical wear and tear. Generally, the equipment manufacturers provide a
maintenance schedule based on the number of hours of service.
Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of MDSOPT can be described using a module diagram. All the modules
in the diagram are explained in the next sections.
GUID-6BE6D1E3-F3FB-45D9-8D6F-A44752C1477C V1 EN
Figure 473: Functional module diagram
Operation time counter
This module counts the operation time. When POS_ACTIVE is active, the count is
continuously added to the time duration until it is deactivated. At any time the
OPR_TIME output is the total duration for which POS_ACTIVE is active. The unit of
time duration count for OPR_TIME is hour. The value is available through the
Monitored data view.
The OPR_TIME output is a continuously increasing value and it is stored in a non-
volatile memory. When POS_ACTIVE is active, the OPR_TIME count starts
increasing from the previous value. The count of OPR_TIME saturates at the final
value of 299999, that is, no further increment is possible. The activation of RESET can
reset the count to the Initial value setting.
Limit Supervision
This module compares the motor run-time count to the set values of Warning value
and Alarm value to generate the WARNING and ALARM outputs respectively when the
counts exceed the levels.
1MRS757644 F
620 series
Technical Manual