590 Series DC Digital Drive Installing the Drive
3-21
Control Connections continued
Enable, Start/Run, Emergency Stop Relay
Start
The basic run/start sequence of the controller is provided by Terminal C3 (Start/Run),
although other safeguards for extra protection are provided by Terminal B8 (Program Stop)
and Terminal B9 (Coast Stop).
Assuming that the Program Stop and Coast Stop terminals are held TRUE, then a single
contact connected between Terminal C9 (+24V) and Terminal C3 (Start/Run) when closed
will cause the controller to energise the Main Contactor and, provided Terminal C5 (Enable)
is also TRUE, will run the associated DC motor.
When the single contact to Terminal C3 (Start/Run) is opened, the controller will decelerate
the motor to zero speed at a rate determined by the STOP TIME parameter’s value and the
MAIN CURR. LIMIT value.
Connect
Terminal C5
(Enable)
to
Terminal C9
(+24V)
in order to
allow the
drive to run.
Connect
terminals B8
& B9 to C9 via
an Emergency
Stop relay.
Connect
terminal C3 to
C9 to run/start
the controller/
motor.
Refer to Chapter 6: “Application Programming” - STOP RATES for further information.
The Enable input is useful to inhibit the drive without opening the main contactor, however, it is not a safe mode of operation as
the drive dc output is only reduced to zero. If the equipment controlled by the drive is to be serviced, then this method should be
avoided and the drive disabled and isolated.
A regenerative drive can be stopped using a Normal Stop, a Program Stop, or an Emergency Stop, as described below. However, a
non-regenerative drive can only be made to stop faster than friction and loading will allow by Dynamic Braking.
Normal Stop
If the +24V is removed from Terminal C3 whilst the drive is controlling the motor under "Run" conditions, the controller will cause the
motor to decelerate rapidly to rest at a rate determined by STOP LIMIT, STOP TIME and CURR. LIMIT.
Program Stop
If the +24V is removed from Terminal B8 whilst the drive is controlling the motor under "Run" conditions, the controller will cause the
motor to decelerate rapidly to rest at a rate determined by PROG STOP I LIM, PROG STOP LIMIT and PROG STOP TIME. If the signal
is re-applied to Terminal B8, the motor remains stationary until a new Start command is applied to Terminal C3 (Start/Run).
Emergency Stop
Additional terminals, Terminal B8 (Program Stop) and Terminal B9 (Coast Stop), provide extra facilities for the control of the regenerative
controller:
Terminal B9 (Coast Stop) must be held at +24V to allow closure of the main contactor, the connection provides the power supply to allow
the electronics to operate the auxiliary relay and hence the main contactor.
Connect Terminal B9 (Coast Stop) to Terminal C9 (+24V) via a normally open contact of an "emergency" stop relay. The emergency stop
relay should not be part of the normal sequencing of the system, which is implemented via the Start contacts, but is a relay which can be
operated in exceptional circumstances where human safety is of paramount importance.
Terminal B8 (Program Stop) provides a facility for regenerative braking on a 4 Quadrant drive (590 and 598).
C9
C5
C3
B9
B8
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