6
DKRCC.PS.RQ0.B7.02 /520H8832
© Danfoss A/S (AC-MCI / sw), 2014-11
Manual
Superheat Controller EIM 336
System configuration
The EIM 336 controller is designed to be operated via modbus and
to rely on a constant connection to the master controller of the
system it is located within.
In this configuration the master controller reads the readout
registers from the EIM 336 and uses the parameters to change the
control behaviour of the EIM 336 (see parameter list).
The following control modes are available:
Minimum Stable Superheat search (MSS) is the default control
mode
Manual control
Defrost
Maximum Operating Pressure control (MOP)
Te control (De-humidifying)
Standalone configuration (no modbus communication)
The EIM 336 can be set in a standalone configuration by setting
the “HWMainSwitch” to 1. This will setup the S4 input to be used as
a hardware main switch.
Note that the only external control of the EIM 336 in this
configuration is through the hardware main switch.
The following control modes are available:
Minimum Stable Superheat search (MSS) is the default control
mode
Maximum Operating Pressure control (MOP), but the Diff MOP
option is not available
The following control modes are not available:
Manual control
Defrost
T
e
control (De-humidifying)
Configuration
Controlling manually via modbus
When setting the manual control register “o18 Manual ctrl.” to 1,
the controller will be in manual control. During this mode the
opening degree is controlled by setting the “Manual OD%”. The
manual control mode does not depend on the “r12 Main Switch”,
and will set the opening degree regardless of its setting.
Setting “o18 Manual ctrl.” to 0 again, the controller will assume
normal control, and will open or close from the current opening
degree.
Related parameters:
Symbolic name
PNU
Description
o18 Manual ctrl.
2075
0 = Superheat control,
1 = Manual control
o45 Manual OD%
2064
Manual opening degree in percent.
0 = fully closed,
100 = fully open.
Used when the o18 Manual Control is
set to 1.
Note:
On using system configuration , it is necessary to read the
"Ctrl Stats" register 3100 continuosly, failure to do so will start the
MSS regulation automatically irrespective to the different status of
the External main switch. Refer Appendix 1 for detail.
Using stand alone configuration
The EIM 336 is designed to operate in conjunction with a system
master controller, which will control the settings and mode of
the EIM 336 via modbus. It is however possible to use it as a
standalone controller by setting the “HWMainSwitch” to 1. This will
setup the S4 input to be used as a digital input main switch. When
the main switch is OFF, the valve opening degree will be 0%, when
it is ON the opening degree is controlled with the settings in the
registers, and the sensor inputs.
Note:
That the only external control of the EIM 336 in this configuration
is through the hardware main switch. It is not possible to manually
control the opening degree or change settings, and the defrost
and Te control modes are not available.
Related parameters:
Symbolic name
PNU
Description
--- HWMainSwitch
64100
0 = no external main switch,
1 = S4 input is main switch
ETS 6
S4
EIM 336
Modbus
Danf
oss
80G41.11
EIM 336
S4 = 1
Danf
oss
80G40.11
ETS 6