Connect an RMB to an Analog Drive
Command Outputs (DAC) Wiring
Connections for command outputs
Amp Enable Output
Definition of Fail Safe Wiring
One of the first questions motion system designers must
address is how to wire the AmpEnable to a drive for fail safe operation.
A fail safe drive enable circuit is one that is disabled when either the
controller loses power or control lines are cut. MEI strongly recommends
avoiding any configuration where loss of power leads to a runaway axis.
In many cases, the use of automatic, dynamic braking is recommended for
high-mass, high-speed loads.
AmpEnable Active High Configuration
|
Opto-Transistor
|
Drive
|
|
Active
|
Enabled
|
|
Inactive
|
Disabled
|
AmpEnable Active Low Configuration
Amplifier Enabling from the
MPI
Amplifier enabling is a crucial safety issue in the design
of your application. Your system should be designed to anticipate the
possibility of a sudden loss of power and/or connectivity to the controller
and/or drive.
To make a full accounting of your motion system's safety
features, you must also address the system's mecahnical dynamics with
a disabled drive. (A disabled drive does NOT necessarily mean that all
motion will be stopped!) In many cases, the use of automatic, dynamic
braking is recommended for high-mass, high-speed loads. Determining whether
an amplifier remains enabled or disabled with the controller powered OFF
depends upon several factors:
| |
- Does the drive have an Amp Enable line? (Not all drives
do. Check this!) Is the drive's Amp Enable line internally configured
as active-high or active low?
- How is the Amp Enable line wired between the controller and
the drive? With power OFF to the controller, does wiring pull
the drive's Amp Enable line HIGH or LOW?
- How is the Amp Enable line configured on the controller when
it is powered? Is the Amp Enable output transceiver normally ON
or OFF? Is the Amp Enable output inverted?
- Does the application software maintain the Amp Enable line in
an enabled state when running? Is the controller's position error
limit configured for Abort (disables the drive)? Does the application
respond to states, disabling or enabling the drive?
|
Amp Fault Input
Pull-up Configuration
|
R
|
RMB-10V2-SynqNet
|
|
820
|
RMB-10V2-SynqNet-4-24v
|
|
820
|
RMB-10V2-SynqNet-4c-24v
|
|
6, 8k
|
RMB-10V2-SynqNet-4-5v
|
|
6, 8k
|
RMB-10V2-SynqNet-4c-5v |
Pull-down Configuration
|
R
|
RMB-10V2-SynqNet
|
|
820
|
RMB-10V2-SynqNet-4-24v
|
|
820
|
RMB-10V2-SynqNet-4c-24v
|
|
6, 8k
|
RMB-10V2-SynqNet-4-5v
|
|
6, 8k
|
RMB-10V2-SynqNet-4c-5v |
|
