9. Troubleshooting
9.1 Troubleshooting for Multi-line 2 and Uni-line products
9.1.1 Remedy of problem
The troubleshooting table can be used for the Uni-line and the Multi-line 2 products.
Problem indication Problem cause Remedy
Load sharing or fixed power control (base
load) unstable.
Synchronisation OK.
Single generator running frequency control
OK.
No speed droop on gener-
ators.
Apply 3-4% speed drop on
prime mover governor.
Load sharing or fixed power voltage (VAr)
control unstable.
Synchronisation OK.
Single generator running frequency control
OK.
No voltage droop on gen-
erators.
Apply 3-4% voltage drop on
generator AVR.
Generator not able to take load to 100%. Initial setting of speed gov-
ernor not correct.
See chapters regarding gover-
nor/AVR checks.
Generator not able to take load to 100%. Analogue output from DE-
IF equipment has too low
output range.
Increase the full scale value.
This is mostly a case when us-
ing electronic potentiometers.
Speed decreases when increase was ex-
pected (relay outputs).
Relay outputs "up" and
"down" reversed.
Swap connections.
Speed decreases when increase was ex-
pected (analogue output).
Outputs "+" and "-" re-
versed.
Swap connections.
Engine overspeeds when starting up. Regulator output is too
high.
Decrease the analogue output
signal by decreasing the resis-
tor.
General guidelines for commissioning
4189340703 UK
Troubleshooting
DEIF A/S Page 25 of 25
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