Rockwell Automation FlexPak 3000 Digital DC Drive Version 4.3 - Manual (Page 69)

Configuring the Speed/Voltage Loop 5-21
UNDERWIND ENABLE
Setting this bit to 1
enables two inverter
blocks that permit
underwind operation.
Setting this bit to 0
disables the two
inverter blocks and
permits overwind
operation.
Parameter Range: 0 = DISABLED (overwind)
1 = ENABLED (underwind)
Default Setting: 0
Parameter Type: Configurable
OIM Menu Path(s): This parameter is only available over the network. It
cannot be viewed through the
OIM .
Refer to the appropriate network communication manual for register map
assignments.
To use this register, CONTROL SOURCE SELECT must be set to NETWORK and NETW
REGISTER MAP SEL (P.914) must be set to ALTERNATE .
The inverters are located in the speed loop feedback path (see figure 5.1) and the
current minor loop reference path (see figure 6.1).
If CONTROL SOURCE SELECT is changed from NETWORK to any other control source,
the UNDERWIND ENABLE bit is set to the default of DISABLED . If the setting was
ENABLED , the motor can rotate in the opposite direction when the drive is restarted
with a control source other than the network.
!
ATTENTION: When CONTROL SOURCE SELECT is changed from NETWORK
to another value, UNDERWIND ENABLE is forced to DISABLED . This could
cause the motor to rotate in the opposite direction than it did under
network control. The active speed reference should be set to zero before
starting the drive from the new control source. Slowly increase the speed
reference until the proper rotation direction can be determined. If it is
incorrect, change the setting of the
FORWARD / REVERSE input. The active
speed reference is based on the new control source and the auto or
manual setting. Failure to observe this precaution could result in severe
bodily injury or loss of life.