Page 21
TPCMQ48 SERIES
INSTALLATION & OPERATING MANUAL
Manual No. tpcmq48-4
tpcmq48-man-rev4-0116.indd
17.0 SHELF INSTALLATION
17.1 Mounting
- TPCMQ48 Series 19-inch rack-mount power shelves are provided with universal
rack- brackets that allows them to be mounted into a 1U high space in both 19-inch and
23-inch racks. The brackets can be located at various positions in the side of the shelf to
allow for offset mounting in the rack.
To minimize obstruction to ventilation UNIPOWER advises that any equipment mounted
directly above the TPCMQ48 power shelf should be shorter in overall depth.
17.2
Input Power Connections
- DC input power connections are made to the Terminal Blocks
mounted at the rear of the power shelf. Each module position has its own input terminals.
A 3-wire connection is required for each module position that is to be used. The minimum
suitable cable size for these connections is 14AWG or equivalent. It is recommended that
each input feed is protected by its own circuit breaker. After installation it is important to
ensure that the supplied safety covers are fitted.
17.5
DC Output Connections
- DC output connections are provided at the rear of the power
shelf on two of bus bars. Shelf model TPCMQR1U3-48 has a single 10-32 threaded post
on each bus bar while model TPCMQR1U3-48H has two posts. There is also an adapter
kit available to convert from 2 post to 4 post. The output polarity can be configured either
positive or negative as desired. UNIPOWER can supply various pre-made DC load cables;
see the current data sheet for available options. Users wishing to fabricate their own DC
cables should note that such cables should be rated to handle at least 200A.
17.5.1 Connecting Multiple Shelves in Parallel
- Multiple power shelves can be connected
together to create higher capacity power systems than can be achieved with a single
shelf. UNIPOWER can assist customer with the design of link bars to parallel the
DC output connections.
17.6
Signal Connections
- These connections are made to the D-type connector described in
section 15. Wire size for all signal connections should be 22-24AWG.
17.6.1 Connecting Multiple Shelves in Parallel
- To ensure proper power sharing between
parallel connected power shelves it is important to make sure that current share and
signal returns are connected between each shelf. See sections 15 for details.
17.7 Cooling
- The TPCMQ48 series modules incorporate three DC ball bearing fans. Standard
airflow is from the front to rear with exhaust ventilation holes at the rear of the power shelf.
To minimize obstruction to ventilation there should be a minimum of 3 inches (76mm) free
space behind and in front of the power shelf when it is installed in the rack. UNIPOWER
also recommends that any equipment mounted directly above the TPCMQ48 series power
shelf should be shorter in overall depth so as to not obstruct any ventilation holes in the top
surface.
