ABB MNS - Page 114

108
MNS DTR / MNS Service
Konserwacja i części zamienne
Maintena
n
ce
and Spare Parts
5
Frequency
Install. category
Item
no.
Work to be performed
Measured, test and limit values, operating and auxiliary
materials
A
B
C
Remarks
 Check electrical contacts
 Main contact
 Visual inspection
2a
1
1a
1
X
Refer to
 Check of contact force
Chapter 5.5
 Greasing
Refer to chapter 5.6
 Control plug
 Fastening of outgoing cable unit
 Position; the outgoing cable unit might be pressed out of
its normal position by strong cable forces
 Protective conductor connection
 Condition of the roller in the compartment bottom plate
2.2
Plug-in, disconnectable, railable technique
Cf. also item no. 1.3:
General inspection
2.2.1
MCC’s and outgoing energy distribution feeders
2.2.2
Compensation modules with and without reactor
Check electrical equipment in every module
1a
6m
X
Check of contact gaps,
 Visual inspection of main contacts X01
contact condition and
 Condition of short-circuit protection
lubrication not neces-
sary
 LV HRC fuse
 Fuse continuity
 Fuse tripped
Signs of overload by
mains
 Circuit breaker
 Contact condition
resonance in accord-
ance
 Lubricate contact blades of LV HRC fuses
 Klüberlectric KR44-102
with manufacturer´s
 Check capacitor contactor
instructions
 Check for contact corrosion
 Contact condition
 Switching performance
 No humming, bouncing or chattering of reactor
 Visual inspection of filter circuit reactor
Connections and windings
 Condition
 Capacitor
 Setpoints see chapter 5.15
Use measuring log
 Design without reactor: measure all step
currents
3-phase or capacitance values
 Limit value: I
B
 1,3 x I
n
according chapter 5.17
 Design with reactor: measure the terminal
capacitance
 Discharging device
 Reactor
 Residual voltage after 1 min  50 V
 Resistor bank
 Color change, missing elements
1
Main contact to be checked either according mentioned the time intervals or latest after 100 cycles.