Lenze MCH Series - Manual (Page 70)

66 13435744_EDBMH01_v13
57 SERIAL COMM
This parameter is used to activate serial communications. The options are listed by
number of data bits (8), parity (N,E,O), number of stop bits (2,1) and whether the
watchdog timer is disabled or enabled (W/ TIMR, W/O TMR). When using this feature,
the drive can communicate with a personal computer (PC), programmable logic
controller (PLC), or other external device that utilizes RS-485 serial communications for
control. The serial interface may be used to read present parameter settings (uploading
to the control device), write new parameter settings (downloading from the control
device), monitor present drive activity, and control drive activity. The following settings
are available:
DISABLED
Serial communication function is disabled.
W/ TIMR Enables serial communications with a watchdog timer. If there is
no serial activity (read or write) for more than 10 seconds, the drive
will either trip into a fault, or go to the speed reference selected
in Parameter 24 - AUTO SOURCE, depending on the setting of
Parameter 56 - SERIAL LOSS.
W/O TMR Enables serial communications without a watchdog timer. However,
after 10 seconds of no serial activity, serial control can be turned
off by issuing a STOP command from any source (keypad, terminal
strip) other than the serial link.
NOTE: If a RESET command (Parameter 65 - PROGRAM) is issued through the
serial link, this parameter will not default back to DISABLED. However,
explicitly setting this parameter to DISABLED through the serial link will cut
off communication with the drive.
Modbus is the standard protocol for the MCH. Optional protocols that are available are:
BACnet, LON Works, Metasys N2, and Siemens P1. Please refer to the Lenze AC Tech
website (www.lenzeamericas.com) for documentation on these protocols.
58
SERIAL ADDRES
This parameter is used with the serial communications feature, and is intended for use
in a multiple drive network (RS-485). The serial link will support drives with addresses
from 1 up to 247.
61 PASSWORD
This feature limits access to the programmable parameters for added security. The
correct password must be entered in order to change the parameters.
Pressing the PROG/RUN button on the keypad will activate the PASSWORD prompt.
If the correct password is entered, the PROGRAM MODE is entered and parameters
can be changed.
If the wrong password is entered, the display will flash ERROR: INCORRECT and
then return to the PASSWORD prompt to allow another attempt at entering the correct
password.
If the ENTER key is pressed while PASSWORD reads 0000, the MONITOR MODE will
be entered (if Parameter 64 - MONITOR, is set to ON), which will allow the parameters
to be viewed (except for PASSWORD), but not changed.
NOTE 1:
The factory default value is 0019.
NOTE 2: If PASSWORD is set to 0000, the function is disabled. Pressing the PROG/
RUN key will result in direct entry into the PROGRAM mode without having
to enter a password.