Nextron MASTERTRACE, Руководство по эксплуатации

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8.2
MASTER TRACE Chapter 8 Service & Testing
output can be tested by generating a real alarm in the Con-
trol Module.
8.3 Field Repairs
8.3.1 Replacing a Switch on MS-1DIN2 & MS-2DIN2 Mod-
ules: These modules use mechanical relays mounted inside
the Control Module. Refer to Figure 5.1 in completing the
following steps.
Turn off power to the Control Module and all affected heater
circuits.
• Locate the failed relay and remove the six quick discon-
nects.
• Remove the two #6-32 screws that secure the relay and
remove the failed relay.
• Use Nextron part number 0403-0002 (Potter &
Brumfield # T92S7A22-120) for replacement relay.
• Repeat above steps in reverse order to assemble.
8.3.2 Replacing a Switch on MS-5ADIN2 & MS-10ADIN2
Module: These modules use mechanical relays mounted
inside the Control Module. Refer to Figure 5.5 in complet-
ing the following steps.
• Turn off power to the Control Module and all affected
heater circuits.
• Remove the six #6-32 machine screws (labeled “A”)
from the RTD board.
• Lift off the RTD board and disconnect the ribbon cable
from the RTD board. The RTD connections do not need
to be removed.
• Remove the four #6-32 machine screws (labeled “B”) that
hold the Power Board housing and remove the housing.
• Locate the failed relay and remove the six quick discon-
nects.
• Remove the top #6-32 screw and Nylock nut that secure
the relay and remove the failed relay.
• Use Nextron part number 0403-0002 (Potter & Brumfield
# T92S7A22-120) for replacement relay.
• Repeat above steps in reverse order to assemble.
8.3.3 Replacing a Switch on a Module with SXH, DXH or
TXH Switch Types: These modules use solid-state relays
mounted external to the Control Module. Complete the fol-
lowing steps.
• Turn off power to the affected heater circuits.
• Locate the failed relay and disconnect the wires (ensure
that all wires are adequately labeled).
• Remove the two #6-32 screws that secure the relay, re-
move the failed relay and discard the thermal conductive
pad.
• Use Nextron part number 1007-0003 (Berquist # Q2-101)
for replacement thermal conductive pad. Use Nextron part
number from the panel drawing for replacement relay.
• Repeat above steps in reverse order to assemble.
8.3.4 Replacing a Switch on a Module with DXN or TXN
Switch Types: These modules use mechanical contactors
mounted external to the Control Module. Complete the fol-
lowing steps.
• Turn off power to the affected heater circuits.
• Locate the failed contactor and disconnect the wires (en-
sure that all wires are adequately labeled).
• Remove the four screws that secure the contactor and
remove the failed contactor.
• Use Nextron part number from the panel drawing for re-
placement contactor.
• Repeat above steps in reverse order to assemble.
8.3.5 Replacing a DIN Switch Type Module: Before pro-
ceeding, check that all wires connected to the module are
correctly labeled. Check that the Programming Sheet for
Control Panel or Modules correctly reflects the configura-
tion of the module. The replacement Control Module can be
programmed before it is placed in the control panel by con-
necting a 120 Vac supply to its power input terminals and
following the steps in Chapter 6. Complete the following
steps.
• Turn off power to the Control Module and all affected
heater circuits.
• Disconnect all wires to the Control Module. Refer to Fig-
ure 5.1or Figure 5.5/5.6/5.7 as appropriate.
• Remove the four Nylock nuts that secure the Control
Module to the back plate and remove the module.
• Repeat the above steps in reverse order to install the new
module.
Figure 8.3 RTD Input Test