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5
INM MTL SUM5 Rev 1
2.5 Alarm modules
There are currently 2 types of alarm module, one containing relays, and one without
relays. The non-relay version provides a configuration port and basic diagnostic alarming,
while the other has, in addition, 16 relays that can provide contact or trip alarms for each
of the isolator channels.
Model No.
Description
MTL4-DMA
Diagnostic Module Alarm
MTL4-DMR
Diagnostic Module Relay Alarm
2.6 Surge protection
This is a plug-in unit that provides surge protection for the channel to which it is fitted,
with no additional wiring or cabinet space necessary. The relay version is designed for
use with the relay base modules. The two model types are identical in shape and size.
Consult the data sheet for all applicable ratings.
Model No.
Description
MTL4-SD
Plug-in surge module
MTL4-SDR
Plug-in relay surge module
Figure 2.4
- A surge-protection module
Figure 2.5
- A ground module
2.7 Unused module bases
Where field wiring has been installed in readiness for later expansion, a grounding
module (MTL4-GND) can be installed to temporarily terminate the spare wiring and tie it
safely to ground.
Model No.
Description
MTL4-ICC-50
Isolator connector cover (pk 50)
MTL4-GND
Ground module