MultiTek Synchronising Check Relay
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.
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.
Rated value Un 57.8<500V± 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
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
Both units self powered.
WEIGHT & CASE SIZE
Approx. 0.6kg. 100mm case
Product Code System Voltage Freq. Options
M200-PLD 400V 50Hz Cal at 350C
1. Calibration at temperature other than 230 C