Motor-Drive Mechanism; Control System - ABB UZE Repair Manual

2 Trouble-shooting
Fig. 5. Pressure relay.

2.3 Motor-drive mechanism

2.3.1 Control system

Error condition
LOCAL operation or REMOTE
operation is not possible.
The position indicator gener-
ates no signal.
High oil level alarm.
14
Connection nut
Fault finding procedure
LOCAL operation is not possible when the control selec-
tor switch is in position REMOTE or "0", and REMOTE
operation is not possible in position LOCAL or "0".
1. Check that the contact plate and arm on the
multi-position switch are free from dust and oxide.
Check the contact function with the moving contact
arm in all positions.
2. Check the resilience of the moving contact in the
multi-position switch. The clearance between the nut
and the contact arm should be 0.4–1.2 mm.
For information about how to adjust the resilience,
refer to section Position Transmitter and other Posi-
tion Switches in Maintenance Guide.
1. If there is a measuring amplifier:
Measure the output signal from the measuring ampli-
fier in all position. The signal shall raise linear up to the
highest position.
If no signal, check the feeding to the measuring am-
plifier and to the position transmitter.
2. Check that the signal reaches the position indicator.
Information plate
Valve handle
Test tap (R 1/8'')
fm_00117
1ZSE 5492-128 en, Rev. 4