KSQ104 Automatic Synchronizer “Spot-on”

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Automatic Synchronizer spot-on
KSQ104x2 Brochure
KSQ104EJD42 Brochure



“SPOT-ON” Automatic Synchronizer (Optional Dead-Bus Feature)

  • The fast “Spot-on” synchronizer
  • LEAD and/or LAG synchronizing facility
  • Breaker closing time compensation
  • Frequency differential analog output
  • “Easy view” status presentation
  • Generator speed control (relays)
  • Generator speed reference (analog output)
  • System status output
  • Optional Dead-Bus feature on the KSQ104EJD42 models
The digitally controlled KSQ104x2 provides both visual presentation of voltage differential and relative speed and phase angle relationship and speed control output signals necessary to achieve fast automatic “spot-on” synchronizing between two systems. KSQ104x2 is a direct replacement for the “traditional” KSQ104 and KSQ105.
Its many important features contribute to make KSQ104x2 simply the best choice available for synchronising in any automatic generator control system (PM-system).
KSQ104F2 is the standard and it takes the auxiliary voltage from the monitored voltage on terminal 3 & 4.
KSQ104G2 have separate auxiliary supply on terminal 19 & 20.
KSQ104x2 is used for both single and three phase systems. Any two phases (or phase-neutral) can be used for synchronizing as long as they are the same two phases on both sides of the breaker. The synchronizer is rated for continuous operation and can be left connected when not in use.
Synchronising modes
To adapt the functionality of KSQ104x2 to any specific application, the direction of approach to synchronizing  (LEAD, LAG or NEUTRAL) can be selected as required:
  • LEAD (incomer faster than bus)
  • LAG (incomer slower than bus)
  • NEUTRAL (bi-directional)
LEAD is generally the preferred mode. The synchronizing relay will then operate when the frequency of the incomer is slightly HIGHER than the bus frequency. This is to avoid motoring of the incomer (entering reverse power condition) after the breaker is closed.
The rotary LED display and the direction of the yellow arrows indicate the incomer’s speed relative to the bus. The rotary display is not lit if frequency difference between systems exceeds 5Hz.
Speed control
The raise/lower relays pulses the fuel control governor motor, or an interfacing MXR845x electronic potentiometer. Pulse length and rate of the speed control relays are adjusted on the rear of the unit to suit the dynamic response of any engine regulator. The speed control has a P/I (proportional/integral) characteristic, with a dynamically controlled dead zone.
Alternatively the linear analogue -10 / 0 /+10mA output signal can be used as speed reference to a generator controller, with polarity and amplitude proportional to frequency difference between the two systems when synchronising mode is selected.
System status:
KSQ104x2 is fitted with a system status relay. As standard the unit is powered from generator side (terminal 3 & 4), when power is okay and unit is working correctly the relay activates. It will release on alarm or when unit is not powered. Separate auxiliary supply is needed for continuously system status.
Normal operation                : Closed contact
Alarm condition/unpowered  : Open contact
“SPOT ON” synchronisation  –  CB closing time compensation
The dynamically controlled CB closing time compensation provides SMOOTH synchronizing, avoiding the engine/generator couplings being exposed to excessive torque forces. If FAST synchronization is the priority, accurate “SPOT-ON” synchronizing will still be maintained even with a large frequency difference between the power sources.
The System “P” synchronising principle
The relay closure is initiated at “T” when the breaker coil is energized and finalizes at “P”, assuring a precise “12 o’clock” synchronization (figs 1 and 2). Allowed frequency difference is adjustable between 0.1Hz and 2Hz.
Typical setting for smooth synchronizing is 0,2Hz. The angle “a” varies according to the calculated frequency difference between the two systems. The synchronizer operation and accuracy is not influenced by distorted voltage wave forms or harmonics.
Green lamps indicate voltage presence on reference source (BUS PWR) and incoming generator (GEN PWR). Green lamps also indicate that the voltage and frequency differentials between the two systems are within the limits. The synchronizing relay will close when the above conditions are achieved.
A green lamp (CB close) indicates the close command to the breaker. Frequency difference and voltage limits, circuit breaker closing time, speed control relays pulse length/rate and synchronising mode are user settable on the front of the unit.

Additional information

Weight 2 lbs
Dimensions 9 × 9 × 9 in

KSQ104F2 Automatic Synchronizer "spot-on" without Aux Supply, KSQ104G2 Automatic Synchronizer "spot-on" with Aux Supply, KSQ104EJD42 Automatic Synchronizer "spot-on" with Aux Supply

Monitored Voltage

100-120VAC, 200-240VAC, 380-415VAC, 440-480VAC

Aux Supply

No Aux Supply, 100-120VAC Aux Supply, 200-240VAC Aux Supply, 380-415VAC Aux Supply, 440-480VAC Aux Supply, 12-48VDC Aux Supply

Analog Output

No Analog Output, -10-0-10mA, -10-0-10VDC