The digitally controlled KSQ304E2 is an automatic one-generator
co-generation or peak-shaving management system, which can be used with
any make of GenSet starter together with Megacon's range of standard
protective guards and controllers.
User settable limits on unit rear for frequency sync. difference,
voltage differential, frequency reference, circuit breaker closing time,
fuel regulator pulse width and pulse rate, load trim reference when
paralleled to mains.
Note that the kW load signal input needs to be calibrated to be 0-110% of generator nominal load.
Synchronising modes
To adapt the functionality of KSQ304E2 to any specific application, the
direction of approach to synchronising (LEAD, LAG or NEUTRAL) is factory
set as required:
- LEAD (incomer faster than mains)
- LAG (incomer slower than mains)
- NEUTRAL (bi-directional)
LEAD is the standard mode. The synchronising relay will then close when
the frequency of the incomer is slightly HIGHER than the mains frequency.
This avoids a non-stabilised incomer entering reverse power condition
after synchronisation.
The rotary LED display indicates the incomer's speed relative to the mains, and is lit during frequency mode if the difference between the
systems does not exceeds 5Hz.
During all modes the UP/DOWN arrows indicate the pulses from the raise/lower speed relays.
Speed control
The raise/lower relays pulse the fuel regulator or an interfacing
MXR845x electronic potentiometer. Pulse width and rate can be adjusted
to suit the dynamic response of any fuel 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:
KSQ304E2 is fitted with a system status relay. As standard the unit
is powered from generator side (terminal 3 & 4), when power is ok
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 synchronising, avoiding the engine/generator couplings being exposed to excessive torque forces. If
FAST
synchronisation is the priority, accurate "SPOT-ON" synchronising will
still be maintained even with a large frequency difference between the
power sources. Typical setting for
smooth synchronising is 0,2Hz. The synchroniser operation and accuracy is not influenced by distorted voltage waveforms or harmonics.
Synchronisation
Green LEDs indicate voltage presence on supply source (BUS PWR/MAINS only when
generator is powered) and incoming generator (GEN PWR). Green LEDs also
indicate that the voltage and frequency differentials between the two
systems are within limits. The synchronising relay will close when the
above conditions are achieved.
A green LED "CB CLOSE" indicates the closing command to the breaker. If
any red LED is lit voltage and/or frequency is outside the set limits
for synchronising.
Note: The CB Close LED will flash when unit is ready for
synchronising, but inhibit input is open or synchronising mode is not
selected.
