SYNCHRONISING CHECK RELAY
		SELECTION GUIDE M200-PLL 1 generator 1 bus or 2 generators M200-PLD 1 generator 1 bus with dead bus facility Both units can be used on Single or 3 phase systems. TYPICAL APPLICATIONS The M200-PLL & PLD are synchronising check relays, also known as paralleling relays. They are used to ensure at two AC supplies are synchronised. For a system to be synchronised, frequency, phase angle and voltage have to within pre-set limits. The M200-PLL can monitor either mains bus bar and incoming generator or two generators. The PLL has customer adjustment of the differential voltage between 10 to 30%. This voltage corresponds to 6 to 20 electrical degrees. The unit compares the input voltage and phase relationship of the bus bar to that of the generator when the signal is within the pre-set limits, the relay energises. The M200-PLD operates as the M200-PLL but has the additional feature of the dead bus facility. This enables the relay to energise with a generator supply only, which is a common requirement when mains failure occurs.	TECHNICAL SPECIFICATION INPUT Rated value Un 57.8<500Vą 25% Frequency 50 /60/400 Hz Burden <4VA terminals marked GEN <2VA terminals marked BUS Overload 1.5x Un continuous 10x Un for 3 seconds SETPOINT Range Adjustable 10% to 30% of nominal system voltage (6-20 electrical degrees) Repeatability Better than 0.5% of full span Differential Fixed at 5% Operating time Typically 500ms AUXILIARY Both units self powered. WEIGHT & CASE SIZEApprox. 0.6kg. 100mm case ORDERING INFORMATION Product Code System Voltage Freq. Options M200-PLD 400V 50Hz Cal at 350C OPTION 1. Calibration at temperature other than 230 C