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Chapter 5: Keypad Menu Items and Parameters
5.4.5 – ‘Advanced’ Menu (continued)
Cooling
Range: P53 / B5 Default: On Scaling: n/a Type: R/W
This menu item turns ‘On’ and ‘Off’ the ‘Cooling’ (Inhibit Restart) function. Once this menu item
has been turned ‘On’, and the unit has been started and subsequently stopped, the ‘Cooling’
function inhibits the start command (not allowing the unit to start), until the time held in ‘Cooling
Time’ has elapsed (measured from the last stop signal). During this period the unit displays
‘Stopped. Cooling’. This menu item is mainly for use in commissioning soft-start units that have
large thyristor stacks, and its purpose is to avoid damage to the thyristors during the commissioning
process.
Cooling Time
Range: 0 to 63.75 minutes Default: varies by unit model Scaling: n/a Type: R/W
This parameter holds the time in seconds that the soft-start unit will ignore a start signal if
‘Cooling’ is turned on (see above). By default, this is set to zero (0) for units of less than 242A.
For units of 242A and above, the default value is 420 seconds (7 mins). (Changes should be
entered in seconds.) The default value can be extended, but it should NOT be reduced as it will
invalidate the manufacturer’s warranty.
Temp/Alt Derate
Range: 0 to 50% Default: 0 Scaling: n/a Type: R/W
This parameter enables the user to derate by percentage of Unit Full Load current, where local
temperature or altitude is outside of the normal operating range. (Refer to the Mechanical
Installation chapter for temperature and altitude specs.)
Line Contactor (Breaker Present)
Range: P121 / B3 Default: On (0) Scaling: n/a Type: R/W
This menu item turns ‘On’ and ‘Off’ the ‘Line Contactor’ function, which selects the use by the
customer of an in-line contactor in his wiring configuration.
However, if the decision is made to use a breaker instead, a new mode has been introduced so
that the Soft Start can trip the breaker via the alarm relay when it is in the ‘Stopped and ready’
state (see section 5.1.3). This helps to eliminate the problems that arise when the breaker is closed
and a faulty Soft Start has short circuit devices. The breaker option is selected by turning this
menu item, ‘Line Contactor’, ‘Off’, or by enabling bit 3 of ‘User Flags 4’ (P121).
• P121/B3 = 0 = ‘Line Contactor’
• P121/B3 = 1 = ‘Breaker Present’
(P53.B5)
(P-116)
(P-123)
(P121.B3)
An in-line contactor MUST be used with ‘In Delta’ mode, and the use of an in-line contactor is
always recommended.
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019
5–40