Siemens 6RA70 specifications Internally connected to incoming 460 VAC, 3 Phase

Electronics power supply, main contactor, and fans 1180 to 1680 amps

Function	Terminal			Connection values/Remarks	Possible
					settings
Incoming AC supply	CTB	97		Internally connected to incoming
460 VAC, 3 Phase	CTB	99		460V supply
	CTB	101
Current Requirement for Terminals if supplied from a separate source
1180, 1660 and 1680 amp base drives:			2.5 amps at 460 VAC 3 phase

Note: Phase sequence is important for the fan direction of rotation. The fan must rotate counter- clockwise when viewed from above. If necessary, swap the L1 and L2 phase wiring at incoming supply to change the fan direction of rotation.

Remote relay Enable terminals: 430 amp to 1680 amp base drive panels

Function	Terminal		Connection values/Remarks	Possible
				settings
External enable (if used)	CTB	93	If a remote enable function is required
	CTB	94	using a relay contact, then remove jumper
			J5 and install a normally open low voltage
			contact at terminals 93 – 94.

The 430 amp to 1680 amp Base Drive Panels use a DC contactor that is interlocked through the enable function at regulator terminals 34 and 38. This circuit is brought out to CBT terminals 93 and 94 to allow an easy point to add an external enable contact if required. A remote enable contact can be wired directly to terminals 34 and 38 of the regulator for Base Drive Panels rated 15 to 255 amps.

Siemens Energy & Automation	7-23
SIMOREG DC Master Base Drive Panel	Operating Instructions