84872140 Crouzet USA, 84872140 Datasheet - Page 3

• Manufacturer Part Number: 84872140
• Description: VOLTAGE MONITORING RELAY, SPDT, 20VDC
• Manufacturer: Crouzet USA
• Series: MUSr

Specifications of 84872140

• Contact Configuration: SPDT
• Power Consumption: 1W
• Supply Voltage Max: 20VDC
• Relay Mounting: DIN Rail
• Control Voltage Type: DC
• Relay Terminals: Screw
• Mounting Type: DIN Rail
• Control Voltage: 9V
• Current, Rating: 5 A
• Function: General Purpose
• Power, Rating: 1250 VA
• Relay Type: Electro Mechanical
• Voltage, Control: 12 VDC
• Voltage, Rating: 250 VAC/VDC
• Frequency: 50/60 Hz
• Carry Current: 5A
• Rohs Compliant: Yes
• Control Voltage Max: 15V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

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Principles
Overview
MUS and MUSF voltage control relays monitor single-phase DC network voltages.
These products monitor their own supply voltage.
MUS relays allow the user to choose between two operating modes:
- Under/overvoltage
- With or without fault latching
An adjustable time delay, on threshold crossing, provides immunity from transient phenomena, thus preventing spurious triggering of the output relay.
Operating principle
MUS - Under/Overvoltage controller
The operating mode is set by the user.
A switch is used to select under or overvoltage modes, with or without latching.
The switch position, and hence the operating mode, is read by the product on energisation.
If the switch is set to a non-conforming position, the product goes into fault mode, the output relay stays open, and the LEDs flash to signal the position
error.
If the switch position changes while the unit is operating, all the LEDs flash but the product continues to work normally with the voltage selected on
energisation prior to the change of position.
The LEDs return to their normal state if the switch is reset to its initial position defined before the last energisation.
MUS - Under/overvoltage - without latching
B
C
D
E
F
G
MUS - Under/overvoltage - with latching
B
C
D
E
F
G
Voltage control
Un
Un
Delay on threshold crossing (Tt)
Threshold
Hysteresis
Overvoltage function relay
Undervoltage function relay
Controlled signal
Delay on threshold crossing (Tt)
Threshold
Hysteresis
Overvoltage function relay
Undervoltage function relay
Controlled signal
1
2
3
2
1
4
1
2
3
2
1
4
Tt
Tt
6
6
Tt
Tt
5
5
5
5
The under or overvoltage threshold value is set by a graduated potentiometer by reading the Un
scale to be monitored directly.
The hysteresis is set by a graduated potentiometer from 5 to 20% of the preset threshold. The
hysteresis value cannot be higher than the extremes of the measurement range.
In overvoltage mode, if the controlled voltage exceeds the preset threshold for longer than the
time set on the front face (0.1 to 10 s), the output relay opens and LED R is extinguished. During
the time delay, this LED flashes.
Once the voltage falls below the threshold value minus the hysteresis, the relay closes
instantaneously.
In undervoltage mode, if the controlled voltage falls below the preset threshold for longer than the
time set on the front face (0.1 to 10 s), the output relay opens and LED R is extinguished. During
the time delay, this LED flashes.
Once the voltage rises above the threshold value plus the hysteresis, the relay closes
instantaneously.
If "with memory" mode has been selected, the relay opens and stays in this position when
threshold crossing is detected. The power supply must be disconnected to reset the product.