7
RG-MHBAC
Drive Setup & Programming
57 SERIAL
This parameter needs to be set to either WITH TIMER (default) or W/O TIMER for
the drive to communicate with the LAN. Serial communications will not work if this
parameter is set to DISABLED.
58 MAC ADDRESS
This parameter contains the address of the MCH drive. It is adjustable from 0-254
and has a factory default value of 128.
60 SERIAL TIMEOUT This parameter makes the serial watchdog timeout period selectable. It has a
minimum value of 10 seconds and maximum value of 65535 seconds. The default is
30 seconds. If no action is to be taken when a serial watchdog timeout occurs, Drive
Parameter #57 (Serial) should be set to W/O TIMER. This will disable the watchdog
timer. Otherwise Drive Parameter #57 (Serial) should be set to WITH TIMER.
If the LAN has started the drive or has modified the Speed Source Selection (MV1),
the Keypad Speed Command (AV1) or the Keypad Setpoint Command (AV2) and a
serial watchdog timeout occurs, the drive is taken out of serial control.
If Drive Parameter #30 (Control) is set to SERIAL AUTO and the drive was running
when the timeout occurred, the drive will also stop the motor by tripping into a
SERIAL FAULT. A fault reset command, issued via Clear Fault (BV1), a keypad stop
or a terminal stop is required to clear the fault.
If Drive Parameter #30 (Control) is set to SERIAL SPEED, then the action to be taken
when a timeout occurs is determined by Drive Parameter #56 (Serial Loss).
When Drive Parameter #30 (Control) is set to SERIAL SPEED the speed reference
being used MUST be set to the drive keypad (-KEY, -MKB, -AKB) or the LAN (-SER)
for the serial watchdog to be active. When Drive Parameter #30 is set to SERIAL
AUTO the serial watchdog will be active with any speed reference.
Also, if the LAN has written to the keypad speed command, the speed source
changes from keypad to serial and the keypad speed command cannot be changed
using the drive keypad. In order for the drive keypad to take control of the keypad
speed command, the drive H/O/A must be toggled to HAND or OFF to release serial
control of the corresponding BACnet® object. The same is true of the keypad
setpoint command and the speed source selection.
