Troubleshooting - Deif Multi-line 2 General Manuallines For Commissioning

Multi-line 2
The troubleshooting table can be used for the uni-line and the multi-line 2 products.
Problem indication
Load sharing or parallel with mains power
control unstable.
Synchronisation OK.
Single generator running frequency control
OK.
Load sharing or parallel with mains voltage
(var) control unstable.
Synchronisation OK.
Single generator running voltage control OK.
Uni-line active power load sharing units only:
Load sharing or parallel with mains power
control unstable.
Synchronisation OK.
Single generator running frequency control
OK.
Speed droop OK.
Uni-line active power load sharing units only:
Load sharing stable but not equal.
Synchronisation OK.
Single generator running frequency control
OK.
Speed droop OK.
Uni-line reactive power load sharing units
only:
Load sharing or parallel with mains var
control unstable.
Synchronisation OK.
Single generator running voltage control OK.
Voltage droop OK.
Uni-line reactive power load sharing units
only:
var load sharing stable but not equal.
Synchronisation OK.
Single generator running voltage control OK.
Voltage droop OK.
Generator not able to take load to 100%.
Generator not able to take load to 100%.
Speed decreases when
expected (relay outputs).
Speed decreases when
expected (analogue output).
Engine overspeeds when starting up.
DEIF A/S

9. Troubleshooting

Problem cause
No speed droop on generators.
No voltage droop on generators.
Faulty
voltage and/or current transformer
input.
Load sharers have been mounted to
control the wrong size generators (can
happen in systems with different size
of generators).
Faulty
voltage and/or current transformer
input and/or voltage transducer.
var load sharers have been mounted
to control the wrong size generators
(can happen in systems with different
size of generators).
Initial setting of speed governor not
correct.
Analogue output from DEIF equipment
has too low output range.
increase was Relay
reversed.
increase was Outputs '+' and '-' reversed.
Regulator output is too high.
General Guidelines for Commissioning
connection of measuring
connection of measuring
outputs 'up' and 'down'
DEIF A/S reserves the right to change any of the above
Remedy
Apply 3-4% speed drop on
prime mover governor.
Apply 3-4% voltage drop on
generator AVR.
Correct connections.
Voltage on L1 and L2,
current transformer in L1.
Re-mount the load sharers
to match the generators.
The load sharers are pre-
configured for a specific
generator.
Correct connections.
Voltage on L1 and L2,
current transformer in L1,
voltage transducer to US-
line (term. 38 (+) and 39
(-)).
Re-mount the var load
sharers to match
generators. The var load
sharers are preconfigured
for a specific generator.
See chapters regarding
governor/AVR checks.
Increase the full scale value.
This is mostly a case when
using electronic potentio-
meters.
Swap connections.
Swap connections.
Decrease the analogue
output signal by decreasing
the resistor.
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