IL04915001E
Effective 7/09
5
2. Place the D64RPB30 in a clean dry
enclosure. Locate the relay close to the
isolating device (circuit breaker or contactor)
that is protecting the circuit being monitored.
Provide maximum clearance between the
D64RPB30 and the external CT being used
and any strong magnetic flux producing
devices such as power transformers,
autotransformers, control transformers,
reactors, and high power conductors and
other buswork.
3. Pass the power conductors of the circuit
being monitored (including Neutral if any)
through the external CT’s opening.
4. All connections to the D64RPB30 are by
means of screw clamp pull-apart terminals
rated 10 A, 300 V. Terminals will accept 20-
14 AWG solid or stranded conductors.
Terminals for external connections are:
T1 and T2
for connecting an external CT
FB
for providing an absolute ground
reference to the system (refer to section 3)
L+
for connecting control power’s
‘hot’ or positive side
11 and 12
for access to the normally
closed contact of the relay
13 and 14
for access to the normally open
contact of the relay
5. In order to meet the Electromagnetic
Compatibility (EMC) requirements a firm and
short connection is required between
terminal FB and the nearest chassis ground
point. This distance should be kept to an
absolute minimum. If the D64RPB30 is
mounted on a 35 mm DIN rail a DIN rail
mounted ground terminal block can be
installed beside the unit to act as the chassis
ground point. Use a minimum 14 AWG
stranded conductor.
6. For good EMC behavior it is important (as in
any installation) to run all wiring, especially if
unshielded, close along the chassis or in
metal ducts, avoiding excess lengths.
7. Connect AC or DC control power’s ‘hot’ side
to terminal L+. Control power’s neutral or
negative side must be connected to chassis
ground (refer to section 3).
8. Integrate the relay contacts into the control
circuit. Apply appropriate fusing to protect
the contacts (13 A maximum).
9. Connect the two secondary terminals of the
external CT to terminals T1 and T2 of the
D64RPB30 using a minimum 14 AWG
shielded twisted pair cable. Connect the
shield to chassis ground by means of a
clamp, close to the D64RPB30 (where the
FB terminal is bonded to chassis ground as
well). From the clamp to terminals T1 and
T2 the wires can be left unshielded.
CAUTION: Terminals T1 and T2 are NOT
isolated. They are connected to the FB
terminal internally via a 2.5 V DC voltage
source, shunted with a 7 V transients
suppressing zener diode. DO NOT connect
the external transformer to ground at any
other point. Doing so may damage the
D64RPB30.
NOTE: Use a 500:1 ratio Series A2 C311CT
as specified in section 5, otherwise CT
supervision will not work properly and the
D64RPB30 will trip.
10. After the external CT is installed, test CT
supervision during commissioning by
shorting terminals T1 and T2 for two
seconds. Be careful not to touch any other
circuits. A ‘CT’ trip should occur. Remove
the short and push the reset button to reset
the ‘CT’ trip.
