Danfoss VLT 5000 Series, Инструкция по эксплуатации, Страница: 149 / 240

Heat sink temperature, parameter 537:
States the given heat sink temperature of the frequen-
cy converter. The cut-out limit is 90 ± 5°C, while the
unit cuts back in at 60 ± 5°C.
Alarm word, parameter 538:
States in Hex format whether there is an alarm on the
frequency converter.See section
Warning word 1, Ex-
tended status word and Alarm word for further informa-
tion .
VLT control word, parameter 539:
Gives the control word sent via the serial communica-
tion port in Hex code to the frequency converter. See
the Design Guide for further information.
Warning word, 1, parameter 540:
States in Hex format whether there is a warning on the
frequency converter. See section
Warning word 1, Ex-
tended status word and Alarm word for further informa-
tion .
Extended status word Hex, parameter 541:
States in Hex format whether there is a warning on the
frequency converter.
See section Warning word 1, Extended status word and
Alarm word for further information .
Motor RPM, parameter 557:
The displayed value corresponds to the actual motor
RPM. In open loop or closed loop process control, the
motor RPM is estimated. In speed closed loop modes,
it is measured.
Motor RPM x scaling, parameter 558:
The displayed value corresponds to the actual motor
RPM multiplied by a factor (scaling) set in parameter
008.
561 Protocol
(PROTOCOL)
Value:
FC protocol (FC PROTOKOL) [0]
Modbus RTU [3]
Function:
There is a choice of two different protocols.
Description of choice:
Select the required control word protocol.
For further information about using the Modbus RTU,
see MG10SX.
570 Modbus parity and message framing
(M.BUS PAR./FRAME)
Value:
(EVEN/1 STOPBIT) [0]
(ODD/1 STOPBIT) [1]
(NO PARITY/1 STOPBIT) [2]
(NO PARITY/2 STOPBIT) [3]
Function:
This parameter sets up the drive’s Modbus RTU inter-
face to communicate properly with the master control-
ler. The parity (EVEN, ODD, or NO PARITY) must be
set to match the setting of the master controller.
Description of choice:
Select the parity that matches the setting for the Mod-
bus master controller. Even or odd parity is sometimes
used to allow a transmitted word to be checked for er-
rors. 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
(M.BUS COM.TIME.)
Value:
10 ms - 2000 ms
100 ms
Function:
This parameter determines the maximum amount of
time that the drive’s Modbus RTU will wait between
characters that are sent by the master controller.
When this amount of time expires, the drive’s Modbus
RTU interface will assume that it has received the en-
tire 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 timeout value as short as 35 ms.
If this value is set too short, the drive’s Modbus RTU
interface may miss a part of the message. Since the
CRC check will not be valid, the drive will ignore the
VLT
®
5000 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
146 MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.