RM4TG20 TELEMECANIQUE, RM4TG20 Datasheet - Page 28

• Manufacturer Part Number: RM4TG20
• Description: PHASE MONITORING RELAY, DPDT-2CO, 484VAC
• Manufacturer: TELEMECANIQUE
• Series: RM4r

Specifications of RM4TG20

• Contact Configuration: DPCO
• Phase Type: 3 Phase
• Supply Voltage Max: 484VAC
• Switching Voltage Max: 440VAC
• Relay Mounting: DIN Rail
• Length/height, External: 78mm
• External Width: 22.5mm
• External Depth: 80mm
• Carry Current: 8A

Characteristics :
page 3/56
References :
page 3/56
Dimensions :
pages 3/57
Setting-up :
page 3/57
Zelio Control - measurement and control relays
Liquid level control relays
Presentation
Operating principle
The operating principle is based on a change in the resistance measured between immersed or non immersed electrodes.
Low resistance between electrodes: liquid present. High resistance between electrodes: no liquid present. The electrodes
may be replaced by other sensors or probes which transmit values representing variations in resistance. The a.c.
measuring voltage, which is < 30 V and galvanically insulated from the supply and contact circuits, ensures safe use and
the absence of any electrolysis phenomena.
RM4-L relays may be used:
i For detection of a liquid level, operating with 2 electrodes, one reference electrode and one high level electrode, or an
i For regulating a liquid level between a minimum and a maximum level, operating with 3 electrodes, or an LA9-RM201
The state of the output relay can be configured:
i Empty function
i Fill function
On model RM4-LA32, a time delay can be set on energisation or de-energisation of the output relay in order to raise the
maximum level (function
This function also makes it possible to avoid pulsing of the output relay (wave effect) when operating with 2 electrodes.
Empty function, maximum level detection (2 electrodes or 1 probe LA9-RM201)
Empty function, regulation between a maximum and a minimum level (3 electrodes or 2 probes LA9-RM201)
Fill function, maximum level detection (2 electrodes or 1 probe LA9-RM201)
Empty function, regulation between a maximum and a minimum level (3 electrodes or 2 probes LA9-RM201)
B1: reference electrode
(1) When operating with 2 electrodes, the high level electrode performs both high and low level functions.
LG01
LA32
LA32
LG01
LA32
LA32
LG01
LA32
LA32
LG01
LA32
LA32
Type
RM4-
Type
RM4-
Type
RM4-
Type
RM4-
LA9-RM201 probe. Example: prevention of tank overflow.
probe. Example: water tower.
low level electrode B3 is “dry” (1).
level electrode is immersed (1).
Function
switch 3
Function
switch 3
Function
switch 3
Function
switch 3
Time
delay
switch 4
Time
delay
switch 4
Time
delay
switch 4
Time
delay
switch 4
–
–
–
–
: the output relay is energised when the low level electrode is “dry” and is de-energised when the high
(continued)
: the output relay is energised when high level electrode B2 is immersed and is de-energised when
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U supply
U supply
U supply
U supply
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) or to lower the minimum level (function
A1/A2
A1/A2
A1/A2
A1/A2
B2: high level electrode
B1 B3 B2
B1 B3 B2
B1
B1
B2
B2
B1
B1 B3 B2
B1
B1 B3 B2
B2
B2
t
t
B1
B1
B1 B3 B2
B1 B3 B2
).
B2
B2
t
t
B3: low level electrode
t
t
B1 B3 B2
B1 B3 B2
Te
t
t
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3