180

Diversified Electronics

800.727.5646

atcdiversified.com

The SLD Series is designed to protect 3-phase equipment against

PHASE UNBALANCE, PHASE LOSS, UNDER VOLTAGE and PHASE

REVERSAL conditions.

With normal operating voltage present on all three phases in the proper

phase sequence, the internal relay will energize (PICK-UP). When an

incorrect phase sequence or phase loss occurs or the three-phase line

voltages fall outside the preset unbalance or under voltage settings, the

internal relay will de-energize (DROP-OUT). When all conditions return

to normal, the relay will reset.

The Adjustable Release Delay is provided to ignore momentary voltage

fluctuations that cause nuisance tripping.

Both Delta and Wye systems may be monitored. In Wye Systems, con-

nections to neutral are not required.

NOTE: When a phase is lost while the motor is running, a condition

known as regeneration occurs where a voltage is induced into the open

phase nearly equal in magnitude to the normal phase-to-phase volt-

age. The SLD series is designed to detect this condition when properly

adjusted.

The SLD Series is UL Listed under UL File Number E55826.

OPERATION

SPECIFICATIONS

OPERATING

See Table Below

VOLTAGE

TRANSIENT

1000 Volts For 8 mSEC

PROTECTION

RESET

Automatic

PHASE SEQUENCE

ABC (will not operate CBA)

PHASE UNBALANCE 2% to 10%, Adjustable

RANGE

INDICATORS LED

Glows When All Conditions Are Normal

RESPONSE TIMES

Operate

30 mSEC

Release

0.1 to 20 SEC, Adjustable (on

Under Voltage only); 100 mSEC on

Phase Reversal and Unbalance

TEMPERATURE

Operate

32° to +131°F (0° to +55°C)

RATING

Storage

-49° to 185°F (-45° to +85°C)

U.S. PATENT

4,331,995

NUMBER

WEIGHT

13.5 oz.

MODEL

OPERATING

UNDER VOLTAGE

POWER

HYSTERESIS

OUTPUT RATING

ENCLOSURE

NUMBER

VOLTAGE

DROPOUT RANGE

REQUIRED

SLD-120-ASA

120 VAC

95-115 Adj.

2.5 VAC

SPDT, 10 Amp, Resistive @ 240 VAC

A

SLD-230-ASA

208/240 VAC

185-230 Adj.

3 VA Max.

5.0 VAC

1/2 HP @ 240 VAC

SLD-380-ASA

380 VAC

315-390 Adj.

10 VAC

SLD-440-ASA

440/480 VAC

370-460 Adj.

SLD-120-ALE

120 VAC

95-115 Adj.

5 VAC

DPDT, 5 Amps, Resistive; 345 VA,

E

SLD-230-ALE

208/240 VAC

185-230 Adj.

Inductive @ 240 VAC

SLD-380-ALE

380 VAC

315-390 Adj.

7 VA Max

10 VAC

DPDT, 3 Amps, Resistive; 360 VA,

SLD-440-ALE

440/480 VAC

370-460 Adj.

Inductive @ 600 VAC

All voltage referenced are phase-to-phase.

Phase & Under Voltage Monitor

DIMENSIONS (INCHES)

WIRING

STYLE "E"

STYLE "E"

STYLE "A"

STYLE "A"

IND. CONT. EQ.

496Y