MST-MHT SERIES 071320
2-7
Output connector (or GND terminal of Adapter Kit 219-0618 if installed at the rack adapter) is
connected to chassis (frame) ground. Although the d-c output is isolated from chassis or ground
up to ± 500 V d-c (±400V d-c if Adapter Kit 219-0618 is installed), in certain applications the user
may elect to terminate either the positive or negative terminals to chassis ground in order to
optimize system performance.
Successful d-c grounding depends on careful analysis of the system operation; only general
guide lines are provided here. One of the major points, however, is to avoid ground loops.
Ground loops are created when two or more points of different ground potentials in the output
circuit are grounded. An undesired signal (noise) is developed that is superimposed on the load
(output potential). A way to avoid ground loops is to check for points of resistance to ground. Dif-
ferences in ground potential can be avoided if the output circuit is completely isolated. A single
point can then be selected along the Power Module output circuit and returned to ground with a
single wire. This method is dependent on the specific application.
2.7
PRELIMINARY CHECK-OUT
2.7.1
REQUIRED EQUIPMENT
•
Host computer w/communication cable for selected controller
•
Kepco Controller (See PAR. 1.4.1).
•
RA 55H or CA 400H rack adapter; alternative is to use Input Power/Communication
Cable (see Table 1-3)
•
Load Interface Cable or mating load connector (see Table 1-3)
•
Digital Voltmeter (DVM)
•
Switch (SPST) rated 32V d-c, 1A
2.7.2
INITIAL SETUP
Initial set-up is as follows (See Figure 2-3):
1.
Connect the Unit under test (UUT) to the computer/controller interface (refer to the appropri-
ate Controller Instruction Manual and to the Rack Adapter (RA 55H or CA 400H) Instruction
Manual for source power connections). NOTE: An Alternative configuration using the Input
Power Communication cable in place of the rack adapter may be used.
2.
Install the MST-MHT Power Module into a vacant rack adapter slot (see PAR. 2.5.2).
3.
Configure the Load Connector Adapter and connect DVM as shown in Figure 2-4.
CAUTION: DO NOT repeatedly toggle the power ON/OFF switch as this may cause unit to fault.
4.
Apply a-c power first to the MST-MHT power module(s) by setting Power ON/OFF switch on
front panel to ON., then apply a-c power to the Controller.
Содержание MST 100-2MHT
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