Description of choice:
Select the parity that matches the setting for the Modbus
master controller. Even or odd parity is sometimes used to
allow a transmitted word to be checked for errors. Because
Modbus RTU uses the more efficient CRC (Cyclic
Redundancy Check) method of checking for errors, parity
checking is seldom used in Modbus RTU networks.
571 Modbus communications timeout
Value:
10 ms-2000 ms
100 ms
Function:
This parameter determines the maximum amount of time
that the frequency converter’s Modbus RTU waits between
characters that are sent by the master controller. When
this amount of time expires, the frequency converter’s
Modbus RTU interface assumes that it has received the
entire message.
Description of choice:
Generally, the value of 100 ms is sufficient for Modbus RTU
networks, although some Modbus RTU networks may
operate on a time-out value as short as 35 ms.
If this value is set too short, the frequency converter’s
Modbus RTU interface may miss a part of the message.
Since the CRC check is not valid, the frequency converter
ignores the message. The resulting retransmissions of
messages slows the communications on the network.
If this value is set too long, the frequency converter waits
longer than necessary to determine that the message is
completed. This delays the frequency converter’s response
to the message and possibly cause the master controller to
time out. The resulting retransmissions of messages slow
the communications on the network.
580-582 Defined parameters
Value:
Read only
Function:
The 3 parameters hold a list of all the parameters that are
defined in the frequency converter. It is possible to read
single elements of the list by using the corresponding
subindex. The subindexes start at 1 and follow the order of
the parameter numbers.
Each parameter holds up to 116 elements (parameter
numbers).
When a 0 is returned as parameter number, the list ends.
4.9
Technical Functions
Par. no. Description Display text Unit Range
600 Operating hours (OPERATING HOURS) Hours 0-130,000.0
601 Hours run (RUNNING HOURS) Hours 0-130,000.0
602 kWh counter (KWH COUNTER) kWh Depends on unit
603 Number of power-up's (POWER UP'S) Number of times 0-9999
604 Number of overtemperatures (OVER TEMP'S) Number of times 0-9999
605 Number of overvoltages (OVER VOLT'S) Number of times 0-9999
Table 4.42 600-605 Operating Data
Function:
These parameters can be read out via the serial communi-
cation port and the LCP control unit.
Description of choice:
Parameter 600, Operating hours:
Gives the number of hours the frequency converter has
been operating. The value is saved every hour and when
there is a mains failure. This value cannot be reset.
Parameter 601, Hours run:
Gives the number of hours the motor has been operating
since the reset in parameter 619 Reset of hours-run counter.
The value is saved every hour and when there is a mains
failure.
Parameter 602, kWh counter:
Gives the frequency converter's output energy in kWh. The
calculation is based on the mean kW value over one hour.
This value can be reset using parameter 618 Reset of kWh
counter.
Range: 0 - depends on unit.
Parameter 603, Number of power-ups:
Gives the number of power-ups of the supply voltage
undertaken on the frequency converter.
Parameter 604, Number of overtemperatures:
Gives the number of overtemperature faults that have
been registered on the frequency converter's heat sink.
Parameter 605, Number of overvoltages:
Gives the number of overvoltages of the intermediate
circuit voltage in the frequency converter. This is only
counted when Alarm 7 Overvoltage is active.
NOTICE
Parameters 615-617 Fault log cannot be read out via the
integral control unit.
615 Fault log: Error code
Value:
[Index 1-10] Error code: 0-99
Programming Design Guide
MG27E402 Danfoss A/S © Rev. May/2014 All rights reserved. 123
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