KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 30)

2-12 SERIES EL 071414
2.6.4 PROTECTIVE COVER INSTALLATION
After wiring is complete, it is advisable to install the protective cover over the output load termi-
nals to guard against accidental contact with live terminals. The cover and SEM mounting
screws are supplied with 200V, 400V and 600V models and are optional accessories for 50V
models (see Table 1-4 for part numbers and screw quantities). The cover is comprised of two
pieces, a metal cover protecting the bottom and sides, and a clear plastic piece that protects the
front and top.
First mount the metal cover to the chassis using two SEM screws. Install the clear Lexan cover
over the top of the metal cover and secure to the metal cover using two SEM screws (three
screws for dual chassis models).
FIGURE 2-8. PROTECTIVE COVER INSTALLATION, SINGLE OUTPUT MODEL (TYPICAL)
2.6.5 ANALOG CONTROL CONNECTIONS
Either of two separate inputs can be used for remote analog programming of the load. Each
input can adjust the controlled parameter from 0 to full scale using a 0 to 10V external signal.
Refer to PAR. B.96 to disable analog control, or to enable one of the two external inputs: haz-
ardous, (factory default: enabled, see PAR. 2.6.5.1) or isolated (see PAR. 2.6.5.2). See PAR.
3.17 for analog programming details. For Master/Slave configurations, the remote analog signal
must be applied to all parallel-connected units.
2.6.5.1 HAZARDOUS EXTERNAL INPUT (FAST)
The 0 to10V signal applied to REF IN + terminal (REF IN – return) adjusts the controlled param-
eter (depending on mode selection) from 0 to full scale. (For ±REF IN location see Figure 2-4 for
single or Figure 2-5 for dual output models.) This input uses a 300K Ohm buffer that is not gal-
vanically isolated. It is deemed hazardous per CE and UL requirements because a single point
failure could cause a short between REF IN – and the LOAD – terminal of the unit, leading to
possible lethal and equipment-damaging voltage at the REF IN – terminal. However, the direct
connection between REF IN+ and the input means the response time is fast: 20 microsecond
transients can be accommodated with rise/fall times of under 5 microseconds. Refer to PAR.
B.96 to enable or disable this input.
CLEAR LEXAN COVER
METAL COVER
2. USE TWO SCREWS TO ATTACH
CLEAR LEXAN COVER TO METAL
COVER.
1. USE TWO SCREWS TO ATTACH
METAL COVER TO REAR PANEL.
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