KEPCO KLN Series (750W, 1500W, 3000W), Main Contro Firmware Version 1.70 and higher - Manual (Page 39)

KLN Series 051614 2-13
2.6 COOLING
The power devices used within the power supply are maintained within their operating tempera-
ture range by means of internal heat sink assemblies and variable speed fans with air flow from
front to back. There are no intake or exhaust ports at the top or bottom, permitting stacked rack
mounting with no air gaps between stacked units. If the power supply is located within a confined
space, take care that the ambient temperature, which is the temperature of the air immediately
surrounding the power supply, does not rise above the specified limits (see Table 1-2).
2.7 SETTING UP THE UNIT
The following paragraphs describe the connections and initial KLN setup needed to operate in
the desired mode.
2.7.1 SETUP FOR LOCAL OPERATION
After connecting the unit using either local (PAR. 2.5.6) or remote sensing (PAR. 2.5.7), the unit
will power up in Local mode with no further setup required.
2.7.2 SETUP FOR REMOTE OPERATION VIA RS-485
CAUTION: DO NOT CONNECT THE POSITIVE OUTPUT TO GROUND WHEN RS-485 IS
USED. THERE IS A POTENTIAL SHOCK HAZARD AT THE RS-485 PORT
WHEN POWER SUPPLIES ARE USED WITH RATED OR COMBINED VOLT-
AGE GREATER THAN 400V AND THE POSITIVE OUTPUT OF THE POWER
SUPPLY IS GROUNDED.
Connect the KLN to the controlling computer or to the previous unit in the RS-485 daisy chain
per Figure 2-14. It is recommended that double shielded wire be used to ensure the quality of
remote communication. The last unit on the RS-485 bus requires a 120-Ohm terminating resis-
tor as shown in Figure 2-14.
With all power off, connect the load to the KLN using either local or remote sensing (refer to
PAR. 2.5). If units are to be connected in series or parallel, refer to PAR. 2.8.
Turn power on and refer to PAR. 3.2 for power supply basics. See PAR. 3.3.16 to establish RS-
485 baud rate and PAR. 3.3.18 to establish the RS-485 Address.
SCPI programming is described in PAR. 3.7; Appendices A and B provide syntax for SCPI com-
mon and subsystem commands and queries implemented in this unit. For RS-485 communica-
tion the RS-485 address (Axx x) must precede every command. E.g., to set the brightness to 3
and output voltage to 30 of a unit with RS-485 address 007, send
A007DISP:CONT 3;:A007SOUR:VOLT 30