Westermo RM-505U-2-E - Manual (Page 28)

505U Radio Telemetry Module
Page 28 © September 2002
Typical alkaline batteries used are Eveready E91, Duracell MX1500 etc while Lithium Batteries are
the Eveready L91
The BU-5-1 takes six AA batteries. Do not use rechargeable batteries in the BU-5-1 as their self
discharge life is short. The temperature rating of the BU-5-1 depends on
the battery type
Operation of the 505U will stop during battery change, however
configuration of the module will not be lost when batteries are removed,
so no special procedure is required when changing batteries of the same
type.
Batteries should be inserted as per the drawing - with the BU-5-1
aligned such that the cable comes out of the top of the module.
The BU-5-1 can be mounted in any direction. The enclosure lid can be
rotated.
3.5 Input Signal Connections
3.5.1 Digital/Pulse Inputs
Digital and pulse inputs share the same input channel. Each input is connected between the DIN
connector and COMMON. Inputs can be voltage-free contacts, NPN transistor switches, or a
voltage signal (ON < 1 volt DC, OFF > 2 volts DC).
Inputs can be voltage free contact or open-collector transistor
⊂
GND
505U-2
DIN1
⊂
⊂ DIN2
NPN
Inputs do not have any surge protection. If the sensor or switch is mounted a long way from the
505U module, external isolation such as a relay may be required for surge protection.