Emerson E2 - Manual (Page 147)

Standard Circuits Software Overview • 11 - 5
11.3 Standard Circuits
Refrigerated cases that do not use case controllers are
controlled by Standard Circuit applications. In a Standard
Circuit application, the E2 is responsible for all case mon-
itoring and control; it uses the RS485 I/O Network to both
gather case temperature inputs and activate or deactivate
the liquid line solenoids, defrost modes, and fans. Also,
circuits that use ESR8s and MultiFlex ESRs are controlled
using Standard Circuits.
11.3.1 Refrigeration Control
A Standard Circuit application may apply one of four
different control methods to a case circuit: the Tempera-
ture Monitor method, the Temperature Control method,
Figure 11-3 - Evaporative Condenser Diagram
EVAPORATIVE
CONDENSER
PUMP 2 PUMP 1
WATER
SPRAY
FAN
INLET
OUTLET
DAM
PERS
DISCHARGE
PRESSURE
COIL
WATER SUMP
TEMPERATURE
26509038
AMBIENT
TEMP
WATER SUMP
Input Sensor Type
Wiring
Instructions
Discharge Pressure 500 lb. Eclipse
transducer see Table 9-1 on
page 9-3
Ambient Temp Temperature see Table 9-1 on
page 9-3
Water Sump Temp
(Evap. only) Temperature
(Immersion) see Table 9-1 on
page 9-3
Override Temp Sen-
sors (Evap. only) Temperature
(Pipe-Mount) see Table 9-1 on
page 9-3
Table 11-3 - Suction Group Inputs
Output Device
Wire Output
Board Contacts
to:
Set Fail-safe Dip
Switch to:
Notes
Condenser Fan
(Single-Speed) N.C. N.C. (up) To ensure condensing during network and power failure, con-
denser fans should all be configured normally closed (N.C.)
Condenser Fan
Relay (Variable-
Speed) N.C. N.C. (up) The fan should operate at 100% during loss of communication
with E2.
Dampers (Evap.
only) N.C. N.C. (up) Dampers should be open during communication loss (N.C.).
Evaporator Pumps
(Evap. only) N.C. (see note) N.C. (see note) Some condensers have dual pumps that cycle at even intervals.
One pump should be wired N.C. and the other N.O., so that only
one pump runs during communication loss.
Variable-Speed Fan
Output (to inverter) None (analog point) None (analog point) This 4AO or 8IO analog point sends the 0-100% fan speed sig-
nal to the inverter.
Table 11-4 - Suction Group Outputs
NOTE: Do not set up a Standard Circuit appli-
cation for a case that uses a CC-100 or CCB
case controller. These cases must use Case Cir-
cuit Control applications (see Section 11.4, Case Con-
trol Circuits).