Toshiba GR200 Series Instruction Manual page 1151

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or if the connections between the trip circuit and the BI circuits become open circuit, a signal

"TC1_FAIL" is generated; then, the TCS1 logic will issue a Trip Circuit Fail alarm.

Note: A threshold setting voltage is required for the BI circuits. The user should set the

threshold to one-half of the value of the trip supply voltage. This is because in this

scheme there are two BI circuits connected in series. The supply voltage across the

BI circuit will be divided by two when the 52 contact is closed and the 52b contact

is open. Thus, the BI circuit may fail to operate if the BI sensitivity is only set in

response to the supply voltage. For example, the BI threshold voltage should be

set below 55V when a trip supply voltage of 110V is applied. For the TCS function,

the user should select two BI circuits from the BI2A module, because the BI

circuits of both of these modules can have lower threshold voltages than the BI

circuits that are available in other modules.

Trip circuit

In Example2 a binary input signal is assigned to PLC connection point "TC1_FAIL_SIGNAL1".

With this arrangement if the CB is open, the small monitoring current will not be able to flow

in the BI circuit. Therefore, it is recommended that setting OPT-On is selected for the scheme

switch [TCS1-EN] and that a CB-closed-status signal is applied to PLC connection point

"TC1_FAIL_COND". Monitoring is only enabled while the CB is in the closed position when

using this setting. This setting avoids unnecessary monitoring when the circuit breaker is open

when using this scheme.

Binary input

Binary input

Figure 10.3-2 Connection Example1 for TCS1 logic

TC1_FAIL_SIGNAL1

TC1_FAIL_SIGNAL2

TC1_FAIL_COND

6F2S1915 (0.46)

GRZ200 (Soft 031 & 032)