Tescom ER1200 Series, ER1200-1-1, ER1200-1, ER1200-2, ER1200-2-1 Operation & Service Manual

Form # 1925 Rev. 4/06 TESCOM

TABLE OF CONTENTS

Page

GENERAL OPERATION

ER1200 Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Internal Feedback Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

External Feedback Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

ER1200 CONFIGURATION

Configure Setpoint Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Configure Analog Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Configure Feedback Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

TUNING THE ER1200

Deadband . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Zero & Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Gain & Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ER1200

Operations &

Service Manual

Form # 1925 Rev. 4/06 TESCOM

1

GENERAL OPERATION

INTRODUCTION

The ER1200 is a closed loop pressure control system capable of operating in two different modes.
In the “Internal Feedback” mode, the control is based on the internal pressure sensor, which has a
range of 0 - 100 PSIG. In “External Feedback” mode, the PID algorithm is based on an external,
customer provided transducer. The ER1200 requires both a setpoint, which is the desired output
pressure, and a feedback, the actual output pressure.

INTERNAL FEEDBACK MODE

In internal mode, the ER1200 compares the
feedback signal from the internal pressure
sensor to the setpoint input. Inside the unit,
there are two solenoid valves that control the
output pressure. If the feedback signal is
below setpoint, the ER1200 opens its inlet
valve and increases output pressure. If the
feedback is above setpoint, the ER1200
opens its exhaust valve to decrease the
output pressure. Every 25 milliseconds, the
feedback is compared to the setpoint and a
correction is made to make the output
pressure equal to the desired.

Inlet pressure:

Typical – 110 PSIG
Maximum – 120 PSIG
Minimum – 10 PSIG above required controlled
output pressure

ER1200 VERSIONS

This manual is a comprehensive documentation of specifications and operations of all versions of
the ER1200 Series regulator. The following table summarizes the differences in features for
different ER1200 versions. Use this table to check the version number of your ER1200. The
versions without an internal sensor do not have an “internal feedback” mode option.

PART NUMBER INTERNAL SENSOR 18" CABLE AND WATER TIGHT CONNECTOR

(0-100 PSIG) STRAIN RELIEF AND 2' MATING CABLE

ER1200-1 Yes Yes No

ER1200-2 Yes No Yes

ER1200-1-1 No Yes No

ER1200-2-1 No No Yes

Figure 1

Form # 1925 Rev. 4/06 TESCOM

GENERAL OPERATION Continued

2

EXTERNAL FEEDBACK MODE

In External Feedback mode, the ER1200 can
be used to control flow, position, temperature,
or any other variable that can be affected by a
change in pressure. For the purpose of this
operation manual, we will discuss the control
of pressure. In this mode, the ER1200
compares an external feedback signal from a
customer supplied transducer to the setpoint.
Typically, this mode is used when the ER1200
is combined with either a pressure reducing or
back pressure regulator (shown with a ratio
actuated, pressure reducing regulator, Figure 2).
If the feedback signal is below setpoint, the
ER1200 opens its inlet valve and increases
output pressure. This increases pressure on
the dome of the regulator, opening the main
valve and increasing downstream pressure. If
the feedback is above setpoint, the ER1200
opens its exhaust valve, which decreases
dome pressure, allowing the regulator to
decrease output pressure.

Pressure Connections:

ER1200 inlet pressure is the same as in
internal mode. Refer to regulator installation
and operation instructions and the product
label for maximum inlet pressure information.

Figure 2