ABB RHD250 - Trouble Shooting; Electrical Test Values

Trouble shooting
32 RHD250 ... 4000 42/68-165-EN
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7 Trouble shooting
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This chapter only covers failures caused by the hardware. Use the online-help of the
configuration software for an extended troubleshooting.
failure pattern possible reason troubleshooting
actuator can not move the valve failure either at the actuator or
at the final control element
(e.g., stuffing box tightened too
much)
detach actuator from valve
if the actuator moves the valve is the
possible cause
if the actuator does not run, the actuator
is the possible cause
incorrect electronic unit or
incorrect data set
Compare the nameplate data on the
actuator and electronic unit.
Incorrectly configured
electronic unit
Check/update the settings for the
parametrization software
no communication with the
control system
Check wiring
incorrect wiring between
actuator and electronic unit
Check wiring
motor / brake faulty Check the winding resistance of the
motor and brakes
Check the brake lock
Binary inputs on the electronic
unit are not wired
Make connection
actuator does not react
Brake does not release (no
mechanical "click")
Check the brake air gap (approx.
0.25 mm) and electrical connection to
the brake
check winding resistance of the brake
coil
actuator does not run in AUT
mode, although “AUT” is
selected in the user interface
Binary input 1 (BE 1) not wired Make connection
Check the software settings for the
binary inputs
LEDs in the commissioning and
service panel (CSP) flash
synchronously
Actuator is not adjusted
properly
Adjust actuator
LEDs flash alternately Electronic unit / drive failure
failure when approaching the
end position
Actuator in limit range of
positioning sensor
drive the actuator beyond the adjusted
end position (either manually or using
the push buttons on the CSP); <:hr>(if
necessary disconnect from valve or
damper)
drive the actuator back into the
operating range and connect it to the
valve / damper
re-adjust the operating range
,
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7.1 Electrical test values
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MCS 071 BA MCS 080 BA MC 090 BA MC 100 BA
Winding resistance ± 5 % at 20 °C (68 °F)
motor 21 Ω 8 Ω 3,7 Ω 3,7 Ω
brake 2134 Ω 1688 Ω 1630 Ω 1377 Ω
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