Rockford Fosgate SSC-500 Installation Manual page 12

SECTION 2 — INTRODUCTION
SSC-500 Hydraulic Press Solid-State Control
SSC-500 Control Box
The SSC-500 Press Control is a full-featured, dual-microprocessor based control for hydraulic presses. This control system is designed to comply
with current ANSI Standard B11.2. It is a replacement for existing relay-based or PLC control systems, found in user's plants or can be furnished
for new or rebuilt hydraulic presses.
The basic control consists of a multi-tap voltage control transformer, color-coded terminal strips, ground indicator light, selector switches, keypad/
display, a master control relay, and the SSC-500 control module assembly. As standard, this is furnished in a NEMA 12 enclosure. The master-con-
trol relay is used to provide a hard-wired emergency-stop function.
When this control box is to be wired to an existing main motor starter, the starter must have a 120 volt coil. If the starter does not have this com-
ponent and it is not readily available, please contact Rockford Systems, LLC for a replacement magnetic starter.
The system uses redundant inputs from devices such as palm buttons, foot switches, and light curtain(s). The system output to the down solenoid
valve(s) is provided by redundant monitored solid-state relay/captive contact relay outputs for trip solenoid(s). These output relays are independently
controlled and cross-checked by the microprocessors. This allows control-reliable operation of the outputs in the event of a single control component
failure. Each microprocessor also has its own logic power supply. This decreases the possibility of simultaneous control failure because of a fault within
the power supply system. All inputs and outputs are optically isolated for electrical noise immunity. The operator provides setup information through the
use of the keypad/display and messages are shown on the 16-character LCD display.
Overview of Sequence of Operation
GENERAL
If the ram is not at the "TOS" (top of stroke) limit switch at power up, or the control selector is changed in mid stroke, the message RETURN RAM will
be displayed until the return is depressed. The "TOS," "BOS" (bottom of stroke), and speed change limit switch inputs can be either N.O. or N.C. as
required. (See OPTIONS EDIT programming on page 33.)
OFF
The machine is inoperable in this mode of operation. To initiate any of the following modes of operation, turn the Off/On Selector Switch from the
"Off" to the "On" position.
INCH
To initiate this mode of operation, set the Control Selector to "Inch" and set the Actuating Means Selector to the "Hand" position. In this mode of
operation, the ram moves down when both palm buttons are depressed concurrently and remain depressed. Ram motion will stop when either
button is released; however both buttons must be released and then depressed again in order to reinitiate ram motion. The ram will continue to
inch to the "BOS" limit switch. Return the ram to the "TOS" limit switch by depressing the return/inch-up palm button.
TWO-HAND SINGLE STROKE
To initiate this mode of operation, set the Control Selector to "Single" and set the Actuating Means Selector to the "Hand" position. In this mode of
operation, depressing and holding the run/inch buttons concurrently causes the ram to make one stroke from the "TOS" limit switch to the "BOS"
limit switch and back to the "TOS" limit switch. If either button is released before the machine reaches the "BOS" limit switch, the ram will stop.
Both buttons will have to be released and depressed again in order to reinitiate the cycle. Once the machine has reached the "BOS" limit switch,
the buttons may be released and the control will provide bottom dwell if programmed (see page 28), and return the ram to the "TOS" limit switch. If
the single stroke return mode is enabled, the ram will return to the "TOS" limit switch if either palm button is released prior to reaching the "BOS"
limit switch.
FOOT-SWITCH SINGLE STROKE
To initiate this mode of operation, set the Control Selector to "Single" and set the Actuating Means Selector to the "Foot" position. In this mode of
operation, depressing the foot switch causes the machine to function in the same manner as described for two-hand single stroke. Foot-switch single
stroke requires either a light curtain or the safeguard interlock connection to function. See page 11. If foot trip is enabled in the options edit menu,
depressing and releasing the foot switch causes the ram to make one stroke from the "TOS" limit switch to the "BOS" limit switch and back to the
"TOS" limit switch.
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Rockford Systems, LLC
Call: 1-800-922-7533