Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 34)

Chapter 2
Hardware Description
1 – 30 HP, 230VAC 2 – 60 HP, 460VAC
2-12
Relay Logic (1 – 30 HP 230VAC)
(2 – 60 HP 460VAC)
Main Contactor (M1) Control – Figure 2.10 illustrates the hardware
associated with the control of the coil voltage applied to the Main DC
contactor M1. The coil voltage originates at an external 115 VAC source
at TB2-1. The source voltage may be interrupted before being input to the
drive at TB2-1 by the use of externally controlled contacts. These external
contacts may include an external master coast stop, PLC controlled
contacts, permissive contacts, etc. Main contactor M1 coil voltage is
controlled within the 1395 through the PSI/Switcher Board.
Pilot Relay (PR) Control – K1 and K2 contacts in series with the 115VAC
Coast Stop input to the drive control coil voltage to the Pilot Relay K3.
ECOAST Stop – The “ECOAST Stop” as defined and illustrated, is a
contingency circuit designed to remove power from the motor in event of a
malfunction in the solid state interface drive software which
conforms to
NEMA for electromechanical E Stop of a micro controlled drive.
When an ECOAST Stop is initiated, the DC loop contactor is de-energized
and the motor will coast to a stop unless the drive is equipped with
optional dynamic braking circuitry.
Relay K1 on the Power Stage Interface is the 24V ECOAST Stop relay and
is controlled by +24VDC. As shown in Figure 2.10, +24VDC from the
PSI/Switcher Board is connected to TB3-12 and 11. At this point, an
external (dry) 24 VDC ECOAST stop contact could be used to control the
application of 24VDC to K1 through TB3-9. TB3-12 and 10 should
always be jumpered together to provide a return path for 24VDC. If an
external 24VDC ECOAST Stop contact is not used, then TB3-9 and 11
must be jumpered.
In addition to the 24VDC ECOAST Stop, there is an 115VAC ECOAST
Stop circuit which is also provided as standard in the 1395. 115VAC
enters the PSI/Switcher Board at TB2. Between TB3-4 and 5, an external
(dry) ECOAST Stop contact may be connected. If an external 115 VAC
ECOAST stop circuit is not used, TB3-4 and 5 must be jumpered.
115VAC is returned to the Power Stage Interface from TB3-5 and sent to
contacts of K2. The 115VAC ECOAST Stop Signal is also sent to an
isolation circuit which converts the 115VAC to a +5VDC control Signal
ECOAST which is sent to the Main Control Board.
Main Control Relay – K2 on the PSI/Switcher is the main control relay
which controls turn on voltage to the coil of the pilot relay K3. K2 is
controlled by logic signals from the Main Control board entering the
PSI/Switcher through ribbon connector J10. The two signals which control
K2 are the SYSTRIP and the DCPILOT signals. In order for K2 to
energize PR, there must be no system fault and there must be a DC pilot
relay turn on command. If both these conditions are met, K2 is energized,
and the Pilot Relay is in turn energized.