3ASC25H204 ABB Control unit new automatic controller module

Description

The 216EA61 input unit receives the analogue measured variables from the 216GW61 input transformer module, digitises
them and transfers them to the B448C bus.
The unit has 24 analogue I/P channels, i.e. a maximum of two
216GW61 input transformer modules can be connected to a
216EA61 I/P unit (see also Section 2.6.1.).

connector “a” (upper) : channels CH01…CH12

connector “b” (lower) : channels CH13…CH24
Within the protection system, the designations of the O/P channels correspond to those of the I/P channels. Where a system
requires several 216EA61 units, the measurement channels are
designated within the system according to Table 2.1.
Design
Figure 12.8 shows the front view of the 216EA61 I/P unit, which
is a plug-in unit with a width of 2 standard divisions (2T). The internal auxiliary supply voltage is 5 V and is derived inside the
unit from the 24 V auxiliary d.c. supply. The unit’s main components are:

a 24 (measurement) channel analogue (-40 V…+40 V)-todigital converter

a processor for pre-processing the measured variables
(80C186)

a bus interface (64 kByte DPM/RAM)

a program memory (128 kByte EPROM)

a main memory (64 kByte RAM)

an electrically deletable and programmable data memory
(8 kByte EEPROM).
Frontplate signals and controls (see Fig. 12.8)
LED “ALARM” (red):
Lights when the unit has an internal defect. See Section 6.1.
for possible causes.
LED “MST” (yellow):
Master. Lights when the unit communicates with the bus and
exchanges data. (May light only briefly or flash.)