Generator Faults
Seite/Page 188 - Kaptitel/Chapter 8: Generator Faults 18.12.15
8.7 Generator-Output Voltage is too low
If the AC generated is too low, then the consumers should be disconnected, one after the other, in order to reduce
the load on the generator. Generally the problem is then solved. The frequency should be checked, if the output
voltage is correct after the consumers have been disconnected. Should this be above the prescribed generator idling
speed, it can be assumed that one or several condensers are defective.
8.7.1 Check and discharge the capacitors
Attention!:NEVER check the capacitors whilst the generator motor
is running! Charged capacitors can be lethal. Do not
contact the capacitors with bare fingers or non-insulated
metallic objects! In order to test the capacitors, the
terminal lead wires have to be disconnected using pliers
or a screwdriver with insulated handle(s). Once the wires
have been removed, the capacitors must be discharged
by bridging the capacitor terminals with a discharge
reactor.
The capacitors can be checked using a multimeter with capacitor measuring.
The capacitors fitted inside the cabinet are discharged over the soldered resistor at every capacitor. The discharge
over the discharge reactor (see special tools) is security because the capacitor voltage is lethal.
Fig. 8.7.1-1: Discharge capacitor single phaseDischarge the capacitor - single phase
01. Discharge reactor (5-10kOhm)
02. Multimeter
03. Capacitor
Fig. 8.7.1-2: Discharge capacitor three phaseDischarge the capacitor - three phase
01. Discharge reactor (5-10kOhm)
02. Multimeter
03. Capacitor
At three phase capacitors the discharge must be made
between every phase (L1-L2; L2-L3; L1-L3)
To Next Page
Loading...
