APPLICA TION NOTE 700142B
INSTALLATION OF EN1000 CASCADE-FP (SCR)
Model EN1000 Cascade-FP (SCR) is a Cascade/Multi-Valve Control designed to fire existing SCRs.
This model is equipped with state-of-the-art microprocessor-based logic circuits, valve and control
power supplies, and firing circuits for each of the existing SCRs. The EN1000 Cascade-FP (SCR)
consists of three assemblies to provide easy location and mounting. This document is intended to
provide general installation guidelines and wire routing techniques. All component parts of the
EN1000 Cascade-FP (SCR) are identical to those used in our current Cascade/Multi-Valve controls.
1.0 INDIVIDUAL COMPONENT ASSEMBLIES
Firing Board Assembly
This assembly consists of a 9" X 24" plate containing from 1 to 8 individual firing board assemblies.
Each individual firing board assembly is equipped with a sense transformer and surge resistors
dedicated to each existing SCR. Each individual firing board has inputs for the cathode and gate
connections, the temperature limit switch and 16 pin (In and Out) firing board interface sockets to
cascade firing signals from the microprocessor control board. The main power input terminal strip
is also located on this assembly. The power terminal strip (TS11) inputs are clearly labeled for the
L1 and L2 and the various SCRs H1 connections.
Input/Output Control Power Supply Assembly
This assembly consists of a 9" X 24" mounting plate containing a control power transformer, valve
transformer, peripheral input circuit board, valve output circuit board, and control power fuse block.
Power (L1 and L2) inputs to the valve transformer primary are clearly labeled. The valve output
circuit board (Terminal Strip TS10) provides 8 available 120VAC outputs. The peripheral input
circuit board provides connections for foot switch (initiation), Emergency Stop, Process Outputs,
Pressure Switch, etc., connected via the TS1 terminal strip. Fuse (F1) is a 6/10 amp which limits
current flow to the control circuits.
Control Display Assembly
This assembly , a Display Mounting Plate measuring 9-9/16" X 9-9/16", consists of a microprocessor
control panel display with push button programming and interface ribbon cable connector. Data
entry and direct access to all schedule parameters are possible through this panel. For more
information regarding programming and operation, see Instruction Manual 700194.
Options
Our entire Cascade product line, including the EN1000 Cascade-FP (SCR), can be fitted with the
following options:
RS232 Computer Interface Option (Instruction Manual 700140)
S99 100 Schedule External Schedule Select Option (Application Note 700115)
TSS Terminal Strip Skip (Contactor Disable) Option (Application Note 700138)
PLS Program Lockout (key switch) Option
ENTRON Controls, LLC. 700142B
1402 S. Batesville Road 05/14
Greer, South Carolina 29650
(864) 416-0190
FAX: (864) 416-0195
ENTRON Controls, LLC. • 700142B • Page 1
2.0 INST ALLA TION
When choosing mounting location, bear in mind the wire harnesses joining the assemblies have a
finite length. The various cable lengths are as follows:
J3 Control Power (from Transformer to Display Panel) 30" length
J7 Firing Signal Interface (from Display to Firing Board Panel) 38" length
J4A Initiation Input Interface (from Display to I/O Panel) 31" length
When locating these assemblies, be aware cable routing
distance must be taken into account. Provide some slack to
minimize over-stressing the cable connection terminations.
Locate SCRs near the Firing Board Assembly . SCR gate and
cathode wires should be physically isolated from other wiring
to avoid electrical transients from causing false triggering of
SCRs (fusing may be required). Some SCRs have sensitive
gates. In these cases, special care should be taken to isolate
interconnecting wires.
Use the W iring Diagram (See Reference Information on page
3 for correct Wiring Diagram) to connect the control. When
making connections from Circuit Board to Circuit Board via
a 16 pin ribbon cable, be sure the red stripe (indicating pin 1)
is in the correct orientation. Ribbon cable connections from
Firing Board to Firing Board (In and Out) should already be
installed. Customer connections have been highlighted on the
Wiring Diagram.
Figure 2-1. Input/Output Assembly
mounting detail
Develop a systematic method to install all customer
connections.
Check to insure that no connections are omitted or connected
improperly to guarantee proper operation of the control.
Reference the Wiring Diagram for location of all customer
connections.
Recommendations
Route initiation wires on paths isolated from any valve and
transformer wiring. Isolating high voltage from low voltage
wiring is essential in minimizing internal transients. Connect
a solid earth ground to the control cabinet or mounting location
to avoid electrical shock and insure proper control functionality .
Some SCRs have sensitive gates. In these cases, special care
should be taken to isolate interconnecting wires.
Page 2 • 700142B • ENTRON Controls, LLC.
Figure 2-2. Firing Boar d
Assembly mounting detail
3.0 RETROFIT APPLICATION
The Model EN1000 Cascade-FP (SCR) can be used to retrofit any manufacturer’s cascade/multiweld
welding control depending on the size of the cabinet being considered. If the component assemblies’
dimensions are too large, the SCR Firing Board Assembly may be altered only if the number of
SCRs allows. For example, a Firing Board Assembly may only contain three Firing Boards. Removal
of the unused portion of the plate will provide additional space. The retrofit configuration described
within this document may, or may not, fit the layout of the cabinet being considered.
3.1 RETROFIT CABINET PREPARATION
Remove all contents of the cabinet with the exception of the SCR assemblies and welding transformer
primary wiring. If the Firing Board Circuit is part of the SCR assembly , it must be isolated in order
to allow firing directly from the SCR Firing Boards included on Firing Board Assembly. Install
Firing Board Assembly and Input/Output Control Power Supply Assembly using existing cabinet
studs wherever possible. Mount all three assemblies securely to minimize vibration.
The Display Panel plate dimensions may differ from the original equipment. It may be necessary to
modify the cabinet to provide the 8" X 8" mounting holes. If possible, locate this assembly in the
same space occupied by the panel being replaced.
3.2 RETROFIT TO AN ENTRON CABINET
It may be possible to retrofit this control to existing EN100, EN200, EN300 Series ENTRON
Cascade/Multi-Valve Controls with NEMA Enclosures.
Remove all contents of the cabinet with the exception of the SCR assemblies and welding transformer
primary wiring. When mounting the Firing Board Assembly and Input/Output Control Power Supply
Assembly , panel mounting holes may line up with some mounting studs in the cabinet being fitted.
The Input/Output Control Power Supply Assembly is intended to be located on the side wall of the
control cabinet as shown in Figure 3-1.
NOTICE
Refer to diagrams on page 4 of this document and Mounting Detail 440450-002 for hole locations
and diameter.
Recommendations
Route initiation wires on paths isolated from any valve and transformer wiring. Isolating high voltage
from low voltage wiring is essential in minimizing internal transients. Connect a solid earth ground
to the control cabinet or mounting location to avoid electrical shock and insure proper control
functionality . Some SCRs have sensitive gates. In these cases, special care should be taken to isolate
interconnecting wires.
WARNING
To avoid serious bodily injury and damage to control circuitry, be sure all wiring,
including SCR connections, is correct and secure prior to applying power to control.
REFERENCE INFORMATION
Wiring Diagram ............................................ 421214-026 (230/380/460/575V Operation)
Wiring Diagram ............................................ 421214-015 (230V Operation) - OBSOLETE
Wiring Diagram ............................................ 421214-012 (460V Operation) - OBSOLETE
Mounting Detail............................................ 440450-002
Control’s Instruction Manual........................ 700194
ENTRON Controls, LLC. • 700142B • Page 3
MOUNTING INFORMATION, EN1000-FP (SCR)
IN EXISTING ENTRON CASCADE/MULTI-VALVE NEMA 12 ENCLOSURE
Page 4 • 700142B • ENTRON Controls, LLC.
Figure 3-1. Pictorial View Of Control Panel
Placement In Existing ENTRON Cascade
NEMA 12 Enclosure
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