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5.2.2.2 Analogue inputs
GRE110-400A, 401A, 402A, 420A, 421A and 422A have 4 analogue inputs for phase and earth
current. GRE110-820A and 821A have 4 analogue inputs for phase and earth cuurent and earth
voltage. These current measuring inputs cover both 1 A and 5 A nominal values.
On models 400A, 401A, 420A and 421A, the current inputs should be connected to terminals 1 to 8
of TB1.
On models 402A and 422A, the current inputs should be connected to terminals 1 to 8 of TB2.
On models 820A and 821A, the current inputs should be connected to terminals 1 to 4 and 7 to 8 of
TB1. The voltage inputs should be connected to terminal 5 to 6 of TB1.
2
A minimum 2.5 mm
wire size recommended.
The current input and power supply terminals (TB1 or TB2) can be connected from both sides.
5.2.2.3 Binary inputs
The relay has 2 (or 6) opto-insulated logic inputs. Each input has is separately powered with a dc
voltage.
On models 400A, 401A, 420A, 421A, 820A and 821A, the binary inputs should be connected to
terminals 13 to 16 (or 22) of TB2.
On models 402A and 422A, the binary inputs should be connected to terminals 13 to 16 (or 22) of
TB3.
2
A minimum 1.25 mm
wire size is recommended.
5.2.2.4 Binary outputs (Output relays)
Five output relays are available on the relay. Four relays are programmable, the last relay being
assigned to the signaling of a relay fault. BO3 and BO4 are NOT applicable for direct CB coil
connection.
On models 400A, 401A, 420A, 421A, 820A and 821A, the binary outputs should be connected to
terminals 1 to 10 of TB2.
On models 402A and 422A, the binary outputs should be connected to terminals 1 to 10 of TB3.
2
A minimum 1.25 mm
wire size is recommended.
5.2.2.5 RS485 port
The communication connection (RS485 port) is assigned to terminals 21, 23 and 24 of TB2 at model
400A, 401A, 420A, 421A, 820A and 821A or TB3 at model 402A and 422A. The total length of
twisted pair wires should not exceed 1200 m.
The transmission wires should be terminated using a 120Ω resistor at both extreme ends of the
cable.
The binary input , binary output and RS485 communication terminal is a single side connected
terminal block.
The relay terminal block size and the clearance between the terminals are shown at Fig 5.2.4.
156
6 F 2 T 0 1 7 2
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