QuadTech Sentry Plus Series Instruction Manual page 68

Figures 3-2 and 3-3 illustrate possible remote control connections to the Sentry Plus Series
terminal strip. Use extreme care when using a remote control connection as the High Voltage
Output is being turned ON and OFF with an external signal.
START
RESET
COM
INTER
LOCK
Figure 3-4 illustrates the usage of logic components (transistor, FET or couplers) as a control
circuit. To use this system to control the circuit, the low signal current must be ≤ 2mA and the
input signal's active time must be > 20ms. The relay switch in Figure 3-2 or the coupler control
in Figure 3-4 uses the component's contact for the control action, not both. This can effectively
prevent operation interference however be observant of interference induced by measurement
settings.
START and RESET terminals have unregulated 24VDC present. To initiate a test connect the
START and COM terminals. The input time duration is approximately 20milliseconds. The
above input circuits are not isolated from other internal circuits. To terminate a test connect the
RESET and COM terminals.
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Figure 3-2: Single Control of START or RESET
Figure 3-3: Continuous Control of RESET
Figure 3-4: Logic Components as Control Circuit
START
RESET
COM
INTER
LOCK
START
RESET
COM
INTER
LOCK
START
i'
Ic'
i
Ic
COM
RESET
Photocoupler ON
20ms
Interface