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LR9F electronic protection relays are especially suited to the operating conditions of motors.
They provide protection against:
â— thermal overload of 3-phase or single-phase balanced or unbalanced circuits;
â— phase failure and large phase unbalance,
â— protracted starting times,
â— prolonged stalled rotor condition.
LR9F electronic protection relays are mounted directly below an LC1 F type
contactor. They cover a range from 30 to 630 A, in eight ratings.
The settings can be locked by sealing the transparent protective cover.
A reset button is mounted on the front of the relay.
Two versions are available:
â— simplified version: class 10: LR9 Fâ—3â—â—, class 20: LR9 Fâ—5â—â—.
â— conplete version: class 10, 10A or class 20, selectable, conforming to EN 60947-4-1: LR9 Fâ—â—.
This latter version includes an alarm function which makes it possible to forestall tripping by load shedding.
â— Lift the transparent cover 7 to gain access to the various settings.
â— Adjustment is achieved by turning dial 1 which is graduated directly in Amperes.
â— The setting can be locked by sealing the cover 6.
◠The “Stop†function is obtained by pressing the red “STOP†button 3.
â— Pressing the Test button: actuates the N/C contact, has no effect on the N/O contact.
◠The “STOP†button can be locked by fitting a “U†clip (reference: LA7 D901).
◠The “Test†function is obtained by pressing the red “TEST†button 2
with a screwdriver.
◠Operation of the “TEST†button simulates tripping of the relay and: actuates both the N/O and N/C contacts, actuates the trip indicator 5.
Thermal overload relays:
â— Compensated and differential,
â— With relay trip indicator,
â— For a.c.,
â— For direct mounting on contactor or independent mounting (1).
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