KEPCO MST Series - Manual (Page 28)

2-10
MST SERIES 061813
3. Align slots of the Module with the guides of the Rack Adapter and insert Module into Rack
Adapter slot. Secure with the two thumb screws (maximum torque applied to thumb screws
is 10 foot-lbs).
2.6.3 REMOVAL
To remove the Power Module from the RA 55 Rack Adapter or CA 400 case, proceed as fol-
lows:
CAUTION
When removing a Module from a Rack Adapter under power, the Module POWER switch
must be placed in the OFF position prior to extraction.
1. Loosen the two slotted captive thumb screws that hold the Module in place in the Rack
Adapter until they disengage from the Rack Adapter.
2. Extract the module from the Rack Adapter using the front panel handle.
2.7 GROUNDING
Interconnections linking a stabilized Power Module to an a-c power source and a load are criti-
cal for both performance considerations and safety requirements. For optimum performance
certain rules must be observed. These rules are described in detail in the following paragraphs.
2.7.1 SAFETY GROUNDING
National and international safety standards set procedures for the grounding of a metal cover
and chassis of an instrument connected to an a-c power source.
When properly installed in the RA 55 Rack Adapter, the Power Module chassis is connected to
the RA 55 safety ground terminal via the GROUND pins of the AC/Control Bus connector (Fig-
ure 2-6). For operation of the MST Power Module outside the RA 55 Rack Adapter, consult
Kepco Applications Engineering for assistance.
RA 55 RACK ADAPTER MUST ALWAYS BE GROUNDED WHEN CONNECTED TO AN A-C
POWER SOURCE.
2.7.2 D-C (OUTPUT) GROUNDING
D-C output connections are those between the Power Module and the load, including remote
sensing connections. Despite precautions to eliminate noise such as shielding and twisted wire-
pairs, output connections may pick up radiated noise of a wide frequency. To minimize such
undesired effects, one side of the Power Module output/load may be grounded. Pin 4 of the DC
Output connector is connected to chassis (frame) ground. Although the d-c output is isolated
from chassis or ground up to ± 500 V d-c, in certain applications the user may elect to terminate
either the positive or negative terminals to chassis ground in order to optimize system perfor-
mance.
WARNING