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PDF ( 数据手册 , 数据表 ) EKC347

零件编号 EKC347
描述 Liquid Level Controller
制造商 Danfoss
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EKC347 数据手册, 描述, 功能
REFRIGERATION AND
AIR CONDITIONING
EKC 347
Liquid Level Controller
Manual







EKC347 pdf, 数据表
Manual
EKC 347 Liquid Level Controller
Regulating parameters
Description of setting
Parameter Minimum Maximum
P-band (regulating range around setpoint)
The P-band (proportional band) is a regulating range set around the liquid level
setpoint. The factory setting of 30% will give a regulating range that is 15% above and
15% below the actual liquid level setpoint (see regulation example 2). For ON-OFF
control with a solenoid valve, this parameter must be set to 0% (OFF)
Integration time Tn
Decreasing integration time will result in faster regulation (faster response to changes
in sensor value). Thus a lower integration time will result in more fluctuation in valve
opening percentage.
Period time for AKV and AKVA pulse valves
In most cases, this parameter should not need to be changed. This parameter determines
the length of the control period. The valve is opened for a certain percentage of each
successive period. For example, when full valve capacity is called for, the valve will be
opened for the entire period. When 60% valve capacity is required, the valve will be
opened for 60% of the period. The control algorithm computes the capacity required
for each period.
Maximum opening degree
Minimum opening degree
Dead band or differential setting for ON-OFF control with solenoid valve
n04
n05
n13
n32
n33
0 (OFF)
200 (%)
60 (sec)
600 (sec)
(OFF)
3 (sec)
10 (sec)
0 (%)
0 (%)
100 (%)
100 (%)
Factory
setting
30 (%)
400 (sec)
6 (sec)
100(%)
0 (%)
Establishing a dead band prevents excessive control action when liquid level
percentage is close to the setpoint and oscillating above and below the setpoint.
Dead band is only active when using a motorized ICM valve with motor-actuator
ICAD. Excessive valve movement is eliminated by preventing changes in valve open
percentage until the change needed is greater than the dead band limit.
n34
2 (%)
25 (%)
2 (%)
Differential setting for ON-OFF control is only active when parameter n04=0. It is a
differential set around the liquid level set point.
See regulating examples 1 and 2 on page 6.
Definition of regulating principle
Setting 0 (LOW):
Regulation is on the low pressure side of the system. The valve will close on a rising
liquid level.
Setting 1 (HIGH):
Regulation is on the high pressure side of the system. The valve will open on a rising
liquid level.
n35
0
(LOW)
1
(HIGH)
0
(LOW)
8
USCO.PS.G00.A1.22 / 521U0079
© Danfoss A/S (USCO/HMR_MKS), 10 - 2007







EKC347 equivalent, schematic
Manual
EKC 347 Liquid Level Controller
Danfoss · Refrigeration & Air Conditioning Division · 7941 Corporate Drive · Baltimore, MD 21236
Ph 410-931-8250 · Fax 410-931-8256 · E-mail: [email protected] · Internet: www.danfoss.com/North_America
16
USCO.PS.G00.A1.22 / 521U0079
© Danfoss A/S (USCO/HMR_MKS), 10 - 2007










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