scheider electric MiCOM P746, Technical Manual

Page: 358 / 530

P746/EN MT/A11 Maintenance
(MT) 11-
10
MiCOM P746
P3937ENa
FIGURE 6: SIGMA DELTA INPUT BOARD FIGURE 7: TRANSFORMER PCB
On the right-hand side of the sigma delta input module, there is a small metal tab (figure 8)
which brings out a handle. Grasping this handle firmly, pull the module forward, away from
the rear terminal blocks. A reasonable amount of force will be required to achieve this due to
the friction between the contacts of two terminal blocks, one medium duty and one heavy
duty.
Note: Care should be taken when withdrawing the input module as it will
suddenly come loose once the friction of the terminal blocks has been
overcome. This is particularly important with unmounted relays as the
metal case will need to be held firmly whilst the module is withdrawn.
Sigma delta
input module
Handle
P3010ENb
MT
FIGURE 8: LOCATION OF HANDLE FOR SIGMA DELTA INPUT MODULE
Remove the module from the case, taking care as it is heavy because it contains all the
relay’s input voltage and current transformers.