Vitals Reference Manual
214 Part No. 79-MAN-04, Rev. I E.H. Wachs
to turn the valve up to the torque set by the SETPOINT. If it
is not successful, the machine changes directions and tries
again. The SETPOINT is then increased by a value depen-
dent on the operating mode (EXERCISE or EMER-
GENCY), then the machine tries again.
The SETPOINT continues to increase, if the valve does not
move, until it reaches the LIMIT. At this point the operator
must decide to increase the LIMIT or try again at the same
LIMIT. The LIMIT cannot be increased until the machine
has tried to turn the valve at each of the SETPOINT torques
and the required number of tries at the current LIMIT.
At the beginning of the valve turning operation, the direc-
tion to turn the valve is unknown. The user may optionally
choose a direction for the machine to turn. Otherwise, the
machine attempts to turn the valve in either the right hand
(RH) or left hand (LH) direction until a specified number of
turns (depending on EXERCISE or EMERGENCY mode)
is reached.
Once an operating direction is established, it is referred to as
the FORWARD direction regardless of whether it is RH or
LH. Likewise REVERSE is the opposite of that direction.
During the operation, if the valve reaches a point where it
cannot be turned at the current torque, the machine attempts
to work past the tight spot by reversing and incrementing
SETPOINTS.
Jogging
In order to align the machine with the valve, it is often nec-
essary to move the machine a small amount. This is accom-
plished with the JOG function. The direction of operation is
set by the user. This is done by pressing a ‘JOG RIGHT’ or
JOG LEFT” button on the controller. The torque limit is set
to the current LIMIT. Operation continues in that direction
until the button is released or the LIMIT is reached.
Manual Mode
This mode implements full control by the user. The user has
complete control of the machine direction. Torque is limited
only by the LIMIT value and LIMIT may be incremented at
any time.
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