User manual

Section 12.24 Part B
05 REVERSE CURRENT RELAYS
Three Eclipse (100 ampere) reverse current relays are in the bottom of the Main
Distribution Panel. From inboard to outboard, they control the following units:
1) Port engine generator
2) Starboard engine generator
3) External power
The purpose of the first two reverse current relays is to prevent the main batteries
supplying current to the generators when the engines are at rest or turning at low speed.
This would deplete the batteries.
The third relay prevents discharge of the batteries into an external power system.
The switches in the top two rows are bus selectors. Each has three positions. The central
position is "OFF" and the up and down positions are busses "A" and "B" respectively. Each
bus connects only to the bus selector switches and it is therefore possible to have two
separate generators and load circuits operating at the same time, isolated from each other.
Inside the main distribution panel box are relays and main fuses for all circuits, except the
two fuses for the landing lights and those for the radio equipment. The two relays on the
outboard sidewall are for the starter circuits.
06 GENERATORS:
There are two ECLIPSE NEA-3 generators, each rated at 28.0 volts, 60 amperes D.C. The
rated speed is 2400 to 4200 rpm.
The generators are mounted on the rear of the engines and are driven at 1.4 times engine
speed. Two flexible conduits with connector plugs make electrical connection.
Electrical control switches for the D.C. output of the generators are on the Pilots Main
Panel. These switches allow single or parallel operation of the generators
Generator Overload
Maximum charge rate is 35 amps. If charge exceeds 35 amps for two minutes reduce
loads and/or switch generators off to protect batteries. Charge rate must be reduced to
less than 35 amps, and the faulty system isolated, to prevent damaging the batteries.
07 CIRCUIT BREAKERS
Radio equipment circuit breakers are located next to radio panel.
Generators are fused in the Main Distribution Panel, and are switched from the Pilots Main
Panel position.
Two types of circuit breakers are used, in addition to the special 'HOLD IN' style used in
the Feather/Unfeather circuits. Some circuit breakers look like normal switches but can be
reset after being tripped. Other breakers are of the push/pull type.
CAUTION The propeller feathering circuit breaker is the "non-trip free" type. If the circuit
breaker will not remain normally set in the contact position, the button can be held in for
emergency operation. It should be realized that operation under these circumstances
Rev No: 00 Stichting Catalina PH-PBY
Page: 4 18 May, 2004