Lenze MCH Series User Manual

Page 70

13435744_EDBMH01_v13

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.