Entron EN1000 Cascade-FP (SCR) Application Note

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
[phone]
FAX: [phone]

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