STYLE "E"
IND. CONT. EQ.
496Y
Phase & Under Voltage Monitor
DIMENSIONS (INCHES)
PHASE VOLTAGE MONITORS SLD Series
STYLE "E"
WIRING
STYLE "A"
STYLE "A"
The SLD Series is designed to protect 3-phase equipment against
PHASE UNBALANCE, PHASE LOSS, UNDER VOLTAGE and PHASE
REVERSAL conditions.
OPERATION
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. 20% or > instantaneous trip
Both Delta and Wye systems may be monitored. In Wye Systems, connections 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 voltage. The SLD series is designed to detect this condition when properly
adjusted.
The SLD Series is UL Listed under UL File Number E55826.
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.
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