Lenze MC1000 Series - Manual (Page 68)

64 13435742_EDBM101_v24
The FORM C contacts at TB-16, 17, and 18 are rated 2 amps at 28 VDC or 120 Vac.
Control wiring diagrams show relays in the rest state (coils NOT energized).
NOTE: Models rated above 30 Hp at 200/240 Vac and 60 Hp at 400/480 Vac have a
second Form C relay at terminals TB-19, TB-20, and TB-21. This relay is controlled
by Parameter 52 - TB14 OUT.
55 TB5B LOSS (LOSS OF FOLLOWER ACTION)
This parameter selects the action taken by the drive if the follower signal is lost at
TB-5B. This function is only active if the follower signal is 4-20 mA. The signal is
considered lost if it falls below 2 mA.
FAULT
The drive will trip into a FOLLOWER fault condition.
SP #4 The drive will go to SPEED #4 (Parameter 4).
NONE The drive will go to the programmed minimum speed.
57 SERIAL (SERIAL COMMUNICATIONS)
This parameter is used to activate serial communications. 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:
DISABLE
Serial communication function is disabled.
W / TIMER Enables serial communications with a watchdog timer. If there
is no serial activity (read or write) for more than 10 seconds,
serial control will turn off and the drive will stop.
W / O TIMR 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 1: The keypad STOP button is always active, regardless of what method
(LOCAL, REMOTE, or SERIAL) is being used to control the drive. The remote STOP
input (TB-1) may also be active, depending on how the drive is programmed.
NOTE 2: If a RESET command (Parameter 65 - PROGRAM) is issued through
the serial link, this parameter will not default back to DISABLE. However, explicitly
setting this parameter to DISABLE through the serial link will cut off communication
with the drive.
If developing an application for serial communications, refer to the RS-232/RS-485
Modbus  Communications Protocol Specification.
58 ADDRESS (SERIAL ADDRESS)
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.