Emerson E2 Návod k obsluze Strana 8

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2.2.1 Current Relay Connections
2D and 3D compressors have a current relay in
the terminal box (refer to figure 2.1 above). The
current relay is used to detect an open motor
protector. Route one motor power lead through
the relay as in figure 2.2. Note: 2D TFD and TFE
compressors 6 HP or smaller should pass the
power lead twice through the coil. The minimum
amp draw that the relay can properly sense is 5.5
amps.
Figure 2.2 Current Relay Wiring
2.2.2 Fan Connections
Intelligent Store™ Discus® compressors are not
shipped from the Emerson Climate Technologies,
Inc. factory with fans installed. OEM installation of
fans should follow established regulatory, OEM
engineering and end user specifications regarding
wiring. An optional terminal box fan fuse is avail-
able for protection in the event of an electrical
short condition (P/N 929-0054-00). Refer to figure
2.5 for a picture of this assembly.
Head fan requirements for Intelligent Store™
Discus® compressors are identical to other
Discus® compressors. Refer to AE bulletin
4-1135.
Refer to figures 2.3 and 2.4 for fan installation.
Figure 2.3 4D Fan Installation
Figure 2.4 3D Fan Installation
Figure 2.5 Fan Fuse Assembly
2.3 Controller Requirements
The controller must be an E2 that has been equipped
with a CPC Intelligent Store™ Discus® Network
Interface Board (CPC part number 637-4890). The
controller firmware must be revision level 2.07 or
higher. However, revision level 2.21 or higher is rec-
ommended to ease commissioning.
Refer to CPC E2 RX Refrigeration Controller manual
026-1610 for detailed information regarding the
Intelligent Store™ Discus® compatible rack controller.
2.4 Communications Network
The Intelligent Store™ Discus® and E2 rack controller
communicate with each other over an NCI-485
(Network Communications Interface) distributed
control network. This data communications protocol is
AE8-1337 R1
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