User guide

Mode Page Descriptions - Puller
Modes
(continued)
Switchable Modes
Two of the modes listed are known as switchable modes. These have dual possi-
bilities using a mixture of the modes already discussed. The puller can be started
in one mode and then switched to another. A selector switch appears on the Main
Page in the puller section whenever Master/Analog Remote or Master/Follower
Remote modes are selected. In addition, indicator lights show which of the two
modes are selected. Master in this configuration is referred to as Local.
NOTE: Remotes will affect speed or ratio as determined by the state of the local/remote
selector switch.
See Operation Section entitled, Mode Page Descriptions - Puller Modes,
Remotes.
Bumpless Transfer
A feature known as "Bumpless Transfer" is included for switchable modes. This
ensures that no speed change occurs when switching from remote to local. In this
situation the actual velocity is copied into the local (master) setpoint to ensure
they match. That way the local control is already at the correct speed and no fur-
ther change is required. Bumpless Transfer is not available when switching from
local to remote.
Trim Modes
Two of the modes available are known as Trim Modes. These are summation
modes where two signals are added together to form the puller speed. Master with
Analog Trim uses the speed set by the operator plus an analog correction. An ana-
log position or loop sensor senses the product and provides the speed correction.
Follower with Analog Trim acts in a similar way. It uses a quadrature encoder to
match puller speeds with an analog input to tune the ratio. This is done to balance
speeds due to mechanical differences and product effects.
The Analog Trim portion is typically used to make small changes of a few per-
cent.
A Trim “On/Off” button appears on the Main Page in these modes. It is available
to enable or disable the Analog Trim input. Trim should be disabled when first
starting a product line.
4-48 l Operation