Beckwith Electric M‑0193B Syncrocloser® Unit

• Accurate, independent controls require

no additional instrumentation for field setting

• Various ∆V and ∆F limits available

• Breaker closing times are field programmable

• 50 Hz operation available

Inputs

Gen/Line Voltage, nominal 120 V ac, 145 V ac maximum continuous. Will withstand 200 V ac for 1 sec.

Bus Voltage, nominal 120 V ac, 145 V ac maximum continuous. Will withstand 200 V ac for 1 sec.

Supply Voltage, minimum 100 V ac, maximum 140 V ac.

Enable Auto-Sync close.

Breaker Closing Time; field programmable from 20 to 800 ms.

 NOTE: Gen/Line, Bus and Supply voltages are transformer-isolated to allow complete freedom in

applications.

Burden

Gen/Line or Bus: 0.5 VA maximum at 120 V ac

Supply: 7 VA maximum at 120 V ac

Controls

UPPER VOLTAGE LIMIT (either input): 110 to 140 V ac, accuracy 1–1/2% of full scale

LOWER VOLTAGE LIMIT (either input): 90 to 120 V ac, accuracy 1–1/2% of full scale

∆V LIMIT (MAXIMUM VOLTAGE DIFFERENCE LIMIT): 1 to 5 V ac, accuracy 5% of full scale. Multiples of

this range are available. A ∆V LIMIT of 4 to 20 V ac or lower must be specified if the M-0193B is to be used

in conjunction with the M-0194 Generator Control Unit.

∆F LIMIT (Maximum Frequency Difference Limit): 0.05 to 0.5 Hz, accuracy 3% of full scale. An additional

range of 0.005 to 0.05 Hz is available.

LED Indicators

These LEDs are lit when conditions are met to close the breaker:

• Bus Upper Voltage Limit OK

• Gen/Line Upper Voltage

Limit OK

Breaker Close Relays

• Bus Lower Voltage Limit OK

• Gen/Line Lower voltage

Limit OK

• ∆V Limit OK

• ∆F Limit OK

• M-0193B Ready

Dry output contacts rated to make and carry 20 A up to 250 V dc, interrupt 0.9 A, 120 V dc inductive load;

0.4 A, 250 V dc inductive load. Open contacts or contacts to ground will withstand 1500 V ac for one minute.

Status Contacts

Relay contacts; closed indicates ∆F conditions OK

Relay contacts; closed indicates ∆V conditions OK

These are light duty contacts intended primarily for status interrogation by supervisory control They can be

used to light local lights with the following maximum restrictions: 1/2 A at 125 V dc resistive, 1 A 120 V ac,

250 V dc across open contacts

Minimum Frequency Difference

The guaranteed minimum frequency difference for operation is 0.0005 Hz; however, typical units consistently

operate with frequency differences of 0.0001 Hz.