Connecting More Than One D64Rp18 To Remote Test/Reset; Catalog Numbers - Eaton Cutler-Hammer D64RP18 Instruction Manual

Digital ground fault relay

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Table Of Contents

Table of Contents

D64RP18 SERIES B1 DIGITAL GROUND FAULT RELAY

The terminals are pull apart.

If an external CT is being used, connect the two secondary terminals of the CT to terminals T1 and T2

of the relay using 14 AWG (minimum). Twist the leads to optimise electromagnetic immunity.

Note:

The CT's input terminals T1 and T2 are NOT isolated from the control voltage. If an external

CT is used it is grounded internally via the power supply input and must not be grounded

again externally (ground loops).

For Non-Failsafe operation leave terminals R1 and R2 open or connect a N.O. momentary contact

TEST/RESET button to these terminals.

For Pulsed Trip Auto Reset operation install a jumper between terminals R1 and R2 or connect a N.C.

momentary contact TEST button to these terminals.

Note:

Terminals R1 and R2 are NOT isolated from the control voltage; terminal R2 is internally

connected to terminal N-.

Connect ac or dc control power to terminals N- and L+. Observe polarity.

In order to meet the Electromagnetic Compatibility (EMC) requirements a chassis bond is required

between terminal N- and the nearest ground point. This distance should be kept to an absolute

minimum. If the D64RP18 is mounted on 35 mm DIN rail a DIN rail mounted ground terminal block can

be installed beside the relay to act as the chassis ground point.

Refer to Figure 1, Figure 2, and Table 2. Decide on the connection of field devices to control voltage

and output relay contact terminals by comparing the desired control of the field devices under various

operating conditions.

Figure 1 shows the D64RP18 using its built-in current transformer and a typical connection of an ac

motor starter coil (1M). A remote Reset button with N.O. contacts is connected to terminals R1 and R2

providing Non-Failsafe operating mode. Comparing the operating mode and the output relay contact

states in Table 2, it can be seen that the N.C. contact, terminals 11 & 12, would be used for the starter

coil circuit and the N.O. contact, terminals13 and 14, would control the external red TRIP light. A

manual reset is required after a ground fault trip

Figure 2 shows the D64RP18 using an external current transformer (C311CT 500:1 ratio) and a typical

connection of a circuit breaker with a shunt trip coil (ST). A remote pushbutton with N.C. contacts is

connected to terminals R1 and R2, providing Pulsed Trip Auto Reset operating mode. Comparing the

operating mode and the relay contact states in Table 2, it can be seen that the N.O. contact, terminals

13 and 14, would be used for the shunt trip coil. The D64RP18 will reset automatically as soon as the

ground fault current is interrupted by the tripping action of the circuit breaker.

3.4.1