Hochiki CHQ-ISM/DIN - Manual (Page 3)

Hochiki Europe (UK) Limited 2-3-0-1469/ISS1/SEPT13
NOTE: For both Fig 1 and 2 a S/C fault on the Barrier terminals will be reported back by the CHQ-DSC or
panel sounder circuits as an O/C fault, it will only be reported as a S/C on the CHQ-
ISM status LED’s.
Compatible Barrier types
The CHQ-ISM is capable of supporting the barrier types listed below.
Galvanic Isolators Zener Barrier
MTL5561 MTL7787+ (Can only be used with an Isolated 24V supply to power the CHQ-ISM)
KFDO-CS-Ex1.51
KFDO-CS-Ex2.51
KFDO-CS-Ex1.51P
KFDO-CS-Ex2.51P
Compatible IS Sounders/Beacon types
NOTE: Only ONE I.S sounder OR I.S beacon can be fitted to each barrier channel otherwise correct fault
monitoring cannot be guaranteed. To ensure correct line fault monitoring only the barriers listed above should
be used with the I.S. devices shown in Table 2
I.S. Sounder Model Manufacturer EOL Required
DB5 sounder Fulleon 7K5*
IS-MA1 E2S 7K5
IS-MC1 E2S 7k5 (Fitted to sounder terminals only)
IS28 mk5 Banshee H & B 7K5
IS Beacon Model Manufacturer EOL Required
IS-MB1 E2S 7K5 Ŧ
IS Flashdome Vimpex 7K5 Ŧ *
Table 2
Two End of Line resistors (Minimum 230 mm² surface area) are supplied with the unit to be used with the
appropriate I.S. devices as listed in Table 2. Only these EOL resistors should be used and not substituted
with any equivalent values or types.
* Removing just the EOL will not necessarily generate an O/C fault, this can only be guaranteed by creating an
actual O/C on the line effectively removing the device and EOL.
Ŧ Due to the capacitive nature of the beacon if an EOL test is carried out by removing it, an O/C fault may take
up to one minute to be indicated.
NOTE: When one of the I.S. Barrier circuits is not used, it should be fitted with one of the supplied 7K5 EOL
resistors directly into the CHQ-ISM terminals to prevent an O/C fault from bei
ng indicated on the status LED’s.