MTS Model FlexTest SE - Manual (Page 77)

UPS Systems for FlexTest 40 and FlexTest SE
Models FlexTest® IIm/GT/SE Controller Hardware Installation 77
UPS Systems for FlexTest 40 and FlexTest SE Servocontrollers
To provide an increased level of safety and to address current European
Machinery Directive, any system using an FT40, or FTSE servo controller must
have an acceptable Uninterruptible Power Supply (UPS) properly integrated into
the system.
It is important to note that the UPS will not prevent any unexpected motion if the
controller, or any other electrical subsystem required for control of the system
has an internal failure, including a HPU or a motor drive.
UPS requirements • The UPS must be wired to provide power to the servocontroller and any
peripheral equipment that is instrumental in safe system operation and shut-
down. In some cases it may be feasible and appropriate to provide UPS
power to the hydraulic power unit (HPU).
• The UPS must be sized to provide adequate electrical power for a period of
three minutes after loss of input power.
• The controller must be configured to take appropriate actions for safe shut-
down of hydraulic equipment being controlled. (Appropriate actions depend
on the particular system.)
• Both UPS input power and UPS output power connections must include
strain relief and a twist-lock plug or equivalent.
• UPS systems used in the European Union must be CE marked.
• FT40 (with Model 494.41 System board) and FTSE controllers do not have
dedicated UPS monitoring inputs.The UPS must have input power-loss (AC
Fail) alarm relay contact out and a low battery alarm relay contact out, both
of which must be wired to two of the digital inputs that are part of general-
use DI/O in the FT40 or FTSE controllers.
Note FT40 controllers that include a Model 494.44 or a Model 494.42 system
board have dedicated UPS inputs.
• The controller’s “Event Action” feature must be configured to take
appropriate actions for safe shut-down of hydraulic equipment being
controlled. (Appropriate actions depend on the particular system.)
Battery power
considerations
A UPS with an AC Fail relay contact wired to the controller provides a
mechanism for the controller to identify that the UPS has switched over to
battery power due to a detected AC power failure condition from the facility's
power grid. This fault signal from the UPS can be used by the controller to start a
safe shutdown sequence, ramp command(s) to a safe state(s), and then shut off
the power source.