Data sheet | Voltage monitoring relay CM-EFS.2 - 3

Functions

Operating controls

U/T: green LED – control supply voltage/timing

R: yellow LED – relay status

U: red LED – over- / undervoltage

Application

The voltage monitoring relays CM-EFS.2 are designed for use in single-phase AC and/or DC systems for the simultaneous

monitoring of over- or undervoltages as well as detection of phase loss. Depending on the configuration, one c/o (SPDT)

contact each or both c/o (SPDT) contacts in parallel can be used for the over- and undervoltage monitoring. The devices

operate over an universal range of supply voltages and provide an adjustable tripping delay. Open or closed-circuit principle

as well as ON of OFF delay tripping are configurable.

Operating mode

The CM-EFS.2 have 2 c/o (SPDT) contacts and include 4 measuring ranges: 3-30 V, 6-60 V, 30-300 V and 60-600 V.

The units are adjusted with front-face operating controls. The selection of: ON-delay A or OFF-delay B, open- h or

closed-circuit principle g, latching function ON f or OFF e and 2x1 c/o i or 1x2 c/o (SPDT) contacts j is made

with DIP switches. Potentiometers, with direct reading scale, allow the adjustment of the threshold valuemax (>U) for

a range of instantaneous to a 30 s delay. The hysteresis is fixed at 5 %. Timing is displayed by a flashing green LED labelled

U/T.

1

3

2

4

5

6

position of the adjustment potentiometers 4 and 5

have changed places.