E2 User Manual.book - Emerson Climate Technologies

The PAK can control up to 4 condenser fan groups
containing up to 8 total condenser fans. The PAK condenser
control strategy is sequential TD control with setpoint/deadband
using ON and OFF delays.
The PAK has a compressor/condenser interlock feature
that will override TD control and force the condenser
fans to stage off using the TD control OFF delay when all
compressors are off. This feature can be disabled with an
Enable/Disable setpoint or when the discharge pressure is
above a configurable setpoint.
The MultiFlex PAK boards consist of two circuit
boards: a bottom layer with 16 combination digital/analog
inputs, and a plug-in top layer which contains a combination
of 8 relay outputs and 4 digital DC voltage outputs.
The analog outputs on the Multiflex PAK drive solid
state relays to control the fan stages. The relays control the
compressor groups.
The communication interface is RS485 I/O using the
Standard Extended Address Form for Retail Solutions Distributed
Controllers. Currently, the PAK is designed to
interface with the Retail Solutions E2 controller.
1 INPUT POWER
(24VAC)
LEGEND
9 RS485 TERMINATION
JUMPERS
2 RS485 I/O NETWORK 10 HAND-HELD
TERMINAL JACK
3 PAK INPUTS 1-8 11 RELAY OUTPUT
CONNECTORS
4 PAK INPUTS 9-16 12 RELAY OUTPUT FUSES
(2A rated, 250V slowblow)
5 NETWORK ID DIP
SWITCH (S3)
13 RELAY STATUS LEDs
6 INPUT TYPE DIP
SWITCHES (S1, S2)
7 BOARD STATUS LEDs
(Code A, Code B, General
Status)
8 DC POWER OUTPUTS
(3 at +5VDC, 1 at
+12VDC)
Table 2-9 - MultiFlex PAK
14 RELAY FAIL-SAFE
SWITCHES
15 PAK ANALOG
OUTPUTS 1-4
16 NETWORK STATUS
LEDs
2.2.3 The MultiFlex ESR Board
The MultiFlex ESR Valve Regulator board (P/N 810-
3199), shown in Figure 2-1, is an RS485 I/O Network
electronic stepper valve regulator capable of driving up to
eight stepper motor valves, which are typically used to
control temperature.
Figure 2-1 - MultiFlex ESR Board Layout
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 Retail
Solutions E2 controller (via the I/O Network) and then
regulates the stepper valves according to the data from the
E2.
Each MultiFlex ESR board requires a Class 2, 80VA
24VAC center-tapped transformer for power. Retail Solutions
transformer (P/N 640-0080) is a multi-tapped primary
transformer that may be used with the MultiFlex
ESR board.
2.2.4 Hand-held Terminal (P/N
814-3110)
The Hand-held Terminal (HHT) is used by manufacturers
and service technicians to diagnose and test several
of Retail Solutions' existing and legacy products. The
HHT can be used on any Retail Solutions product with an
RJ-11 connector. The most common applications include:
• All MultiFlex I/O boards and the 8ROSMT
• All Gateway boards
• Stand-alone MultiFlex boards (RTU, RCB, PAK,
CUB)
2-8 • E2 RX/BX/CX I&O Manual 026-1610 Rev 10 06-APR-2010
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7
3
8
10
1 Valve Connectors (8) 6 Termination Jumpers
2 24VAC CT 75 VAC Power Input 7 HHT Jack
General Status LED 8 Network Address Switches
4 I/O Network Input
9 Open LED (8)
5 TX and RX LEDs
10 Close LED (8)
9