Emerson MultiFlex ESR User Manual

1 • MultiFlex ESR I&O Manual 026-1720 Rev 4 06-APR-2010
1Introduction
The MultiFlex ESR Valve Regulator board (P/N
810-3199), shown in (Figure 1-1), is an RS-485
I/O Network electronic stepper valve regulator
capable of driving up to eight stepper motor
valves, which are typically used to control tem-
perature.
When controlling ECT Flow valves, the Multi-
Flex ESR will detect overcurrent, open wire,
stuck valve situations, and generate the appropri-
ate alarms. For non-ECT Flow valves, the Multi-
Flex ESR will only detect overcurrent situations
and generate an alarm. (See Section 8.2.3.,
Alarm Status Screens for details on alarm
descriptions.)
The MultiFlex ESR uses suction side variable-
position evaporator regulators (ESRs) to vary
evaporator pressure for an entire circuit and is an
alternative to mechanical EPR control.
The MultiFlex ESR receives input data from a
CPC E2 controller (via the I/O Network) and
then regulates the stepper valves according to
the data from the E2.
1.1. MultiFlex ESR and ESR-8 Board
Differences
RS-485 I/O Network
The MultiFlex ESR communicates with the E2
directly over the RS-485 I/O network, unlike the
previous version of the board, which communi-
cated with the controller over the Echelon net-
work.
Center-Tapped Transformer
For power, a Class 2, 80VA 24VAC center-
tapped transformer is required for each Multi-
Flex ESR board. (Previous board versions did
not require a center-tapped power source.)
Molex Connectors (Board P/N 810-1398)
The discontinued MultiFlex ESR board’s valve
outputs are four-contact molex connectors
instead of the screw terminals. Valve cables hav-
ing a four-contact molex connector are plugged
directly into the board. This board has been dis-
continued and replaced with the new MultiFlex
ESR board version (P/N 810-3199).
Hand-Held Terminal (HHT)
Set configuration parameters, setpoints, and fail-
safe conditions of each valve with the HHT. By
using the HHT, each valve output can be set sep-
arately with a valve step rate and the total num-
ber of steps from closed to fully open.
Snap-Track Mounting
The MultiFlex ESR board fits into the standard
CPC 4" I/O board snap-track for mounting.
Figure 1-1 - MultiFlex ESR Board Layout
8
3
7
24VAC CT 75 VAC Power Input
Valve Connectors (8)
I/O Network Input
Termination Jumpers
Network Address Switches
General Status LED
1
5
2
3
4
6
7
8
HHT Jack
TX and RX LEDs
9
10
Open LED (8)
Close LED (8)
9
10

Emerson MultiFlex ESR Specifications

General

Brand	Emerson
Model	MultiFlex ESR
Category	Controller
Language	English