P
AGE
55
5.3.8 TEST 8 CURRENT OUTPUT 2 TEST
This test is the same as Test 7 except that it is for Output 2.
5.3.9 TEST 9 AUXILIARY INPUT TEST
This test allows the operator to verify that the auxiliary inputs used for motor modulation
feedback and remote Run/Hold contact closure are functioning properly. A variable voltage
source, 5VDC, is required for testing.
With tSt9 displayed, press and hold the DOWN key, then press the SCROLL key. The
Auxiliary input voltage will be displayed to the nearest hundredth of a volt. Connect the +5V
source across the Auxiliary input terminals (terminals 8 and 5) and adjust the supply up and
down to verify that it changes on the display. The displayed voltage should typically be
0-5VDC +/- 0.3 volts. To terminate the test, press the SCROLL key. The display will show
tSt9. Test 9 can be initiated again or another may be selected. The existence of the auxiliary
inputs tested in Test 9 depends upon the hardware configuration.
5.3.10 TEST A COMMUNICATION HARDWARE TEST
(Communications Option)
This test allows the operator to verfiy that the communications hardware is functioning
properly.
With tStA displayed, press and hold the DOWN key then press the SCROLL key. The display
will indicate SEnd. Each time the DOWN key is depressed, the unit will toggle between SEnd
and rEC (receive). With the desired function selected, depress the SCROLL key. The unit
will perform as described below.
In the SEnd (send or transmit) mode, the unit will repeat the following sequence. First it will
enable the transmitter and put a logic 1 on the line for one second. Second, with the
transmitter still enabled, it will change the logic level to 0 for one second. Third, it will disable
the transmitter for one second. In the rEC mode, the unit will have its transmitter continuously
disabled. In either mode, the unit will monitor the line and display rEC1 or rEC0 when it
senses a logic 1 or 0 on the line respectively. In the SEnd mode, the unit will display rEC
when the transmitter is disabled.
To perform an internal test and verify the basic operation of the hardware, place the unit in the
SEnd mode and verify that the display cycles through rEC1, rEC0 and rEC. To verify that the
transmitter functions properly, two LED''s, each with a current limiting resistor, can be
connected to the communications terminals, with their polarities connected oppositely, and it
should be observed that the following states are produced: one LED on, then the other LED
on, then both off. Alternately, a load resistor can be placed on the terminals and it can be
observed that the voltage generated across the load resistor is as follows : >+3 VDC, then
>-3 VDC, and then 0 VDC.
Another method, which would also apply to an applications network, would be to connect one
or more units in the Receive mode to a first unit in the Send mode. All of the units in the
Receive mode should have their display alternating in sync with the first unit which is in the
Send mode. When the sending unit displays rEC, the receiving units should display rEC1.
To terminate the test, press the SCROLL key for one second. Upon exit, tStA will be
displayed. Test A can now be initiated again or another test selected.