TOS8870A
OPERATION PROCEDURE
23
3) INTERLOCK terminal
To ensure the safety of operators, the tester is provided with an interlock function which cuts off the
power in cooperation with an external device. When this function is activated, the protection mode
is entered (PROTECTION lamp goes on) and the power is cut off, retaining the condition in which
testing is disabled. While this function is active, it cannot be canceled by the STOP switch on the
panel or the STOP signal for remote control.
This function allows testing to be protected from outside, ensuring safe operation.
Using the interlock function
The INTERLOCK terminal on the rear panel is the input terminal of the interlock signal.
When the terminal is opened, it becomes high level and the interlock function is activated to acti-
vate the protection mode.
To cancel the protection mode by the interlock function, short-circuit the terminal to set it to the low
level, then press the STOP switch on the front panel or input the STOP signal for remote control.
Fig.3-9
•
With the tester in the loaded condition, the interlock terminal is short-circuited with a
shorting piece to cancel the protection mode on a casual basis. To perform a with-
standing voltage test, you must use the interlock function to operate the tester.
3.6 Output Signals
The Tester delivers the following signals from the SIGNAL OUTPUT terminal on the rear panel
other than the lamp and buzzer signals.
[1]
TEST ON signal
This signal is generated and remains on for the entire period of either the single test or the auto-
matic test.
[2]
PASS signal
This signal is generated when a PASS judgement is made at the end of a single test with the timer or
at the end of the latter one of automatic tests. The signal lasts for approximately 50 ms.
Signal
Condition for Delivery
Type and Rating
[1]
TEST ON
Entire period during test is on.
Make-contact signal
Ratings:
125 VAC/1 A
30 VDC/1 A
[2]
PASS
When test is over. About 50 ms
[3]
ACW / FAIL
When FAIL judgement is made for withstanding voltage test.
Continuous.
[4]
IR / FAIL
When FAIL judgement is made for insulation resistance test.
Continuous.
[5]
READY
When in ready for test.
TOS8870A
Voltage, current rating of the S1 switch
30 VDC, 0.1 A or higher
Wiring material
AWG22 (single wire Ø0.65, twisted wire 0.32 mm )
INTERLOCK terminal
(rear
panel)
OPEN
CLOSE
: PROTECT
: OPERATE
2
S1
CAUTION
