MST-MHT SERIES 071320
2-3
2.5
INSTALLATION/REMOVAL
The MST-MHT Power Module is designed to be rack-mounted in an RA 55H Rack Adapter.
Refer to Figure 1-1 for outline dimensions. For installation in confined spaces, care must be
taken that the surrounding environment does not exceed the maximum specified ambient tem-
perature (45 ° C); see PAR. 2.4. The MST-MHT Power Module may be shipped either individu-
ally, or already installed in an RA 55H Rack Adapter. Follow power module installation
procedures in RA 55H Instruction Manual.
2.5.1
CHANGING CONTROL BUS ADDRESS (NODE OR CHANNEL NUMBER)
Each MST-MHT Power Module connected to the IEEE 1118 bus must have a unique address
(also referred to as node or channel number). For MST-MHT modules, this address is a second-
ary address. The primary address is reserved for the MST 488-27 Controller which then
addresses the MST-MHT modules on the bus using the secondary address. The secondary
address from 0 to 30 is selected by DIP selector switch S1 accessed through the top of the unit
(see Figure 2-2) and can be changed in accordance with Table 2-4. This address is set at Kepco
to 1.
NOTES: 1.
Although 31 unique addresses are provided, the maximum number of instruments
which can be managed by the Kepco Controller is 27.
:
2,
Secondary address 0 is not supported if the MST488-27HT controller is com-
manded to operate as an MST 488-27 (non-HT suffix) unit by sending SYST:SET
SA0. For this case the secondary address switch value becomes the node (pri-
mary) address of the MST power module. See the MST 488-27 (non-HT suffix)
Programmer manual for more details on this non-standard mode of operation.
TABLE 2-3. REAR TERMINATIONS
REAR TERMINATION
FUNCTION
AC Input/Control Bus connector
Connects the MST-MHT Power Module to single-phase a-c power, safety ground, and
two-wire IEEE 1118 bi-directional Control Bus.
DC output connector (mates with Con-
nector Adapter Kit 219-0618, installed
on either MST-MHT power module or
RA 55-H rack adapter.
Connects the MST-MHT Power Module output lines, sensing lines, frame ground lines
and current share bus to the load via Kit 219-0618 Connector Adapter. Kit 219-0618
provides enhanced filtering of the output and 6-32 screws for lug wiring.
Summary of Contents for MST 100-2MHT
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