Specification :

Measurements
GCU800 measures the electrical parameters
of the generator-set 10 times per second.___
The measurements are
true RMS and 0.5% accurate. GCU800
averages the incoming measurements and
updates the display (LCD) approximately onceper second.
GCU800 measures all the electrical
parameters of three phase generators, see
table 1. One phase of the mains (or the
generator bus) that serves as a reference
for the built-in synchronizer is also measured,
see table 2.
The ¡°synchroscope¡± measurements, see table
3, show the difference between the generator
parameters and the parameters of the reference phase.
Table 4 shows the engine related
measurements. Single lead resistive senders,
the common automotive type,
can also be used as GCU800 effectively
cancels the battery ground noise.
GCU800 has three 4-digit counters that
record the system¡¯s activity, see table 5. Like
the kW-Hour and theHours-Run, the value of
these counters is preserved while GCU800¡¯s
DC supply is switched off. The counters
are protected by two passwords from user tampering.
Protection
The generator protective functions (table 6)
Parameter Transducer
Table 1 Generator measurements
Volt Generator Phase U none
Volt Generator Phase V none
Volt Generator Phase W none
Volt Generator Phasen U-V none
Volt Generator Phasen V-W none
Volt Generator Phasen W-U none
Amp Generator Phase U CT ../5A
Amp Generator Phase V CT ../5A
Amp Generator Phase W CT../5A
Frequency Generator none
kW Generator Phase U none
kW Generator Phase V none
kW Generator Phase W none
kW Total all phases none
kVA Generator Phase U none
kVA Generator Phase V none
kVA Generator Phase W none
kVA Total all phases none
kVAr Generator Phase U none
kVAr Generator Phase V none
kVAr Generator Phase W none
kVAr Total all phases none
kWh-counter none
Power Factor Gen.Phase U none
Power Factor Gen.Phase V none
Power Factor Gen.Phase W none
% THD Gen. Phase U none
% THD Gen. Phase V none
% THD Gen. Phase W none
2 and the engine
protective functions (table 7) are based on the
measurement system. All these functions have
user adjustable trip-points and time-delays.
Engine Management
GCU800 disposes of a total of
11 auxiliary relays 380V~/10A of which
3 relays are built into the microprocessor
and 8 relays are part of the
auxiliary board IOB (Input/Output
board). Table 8 contains a list of the
protection devices of which some
relays have optional functions.