Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 28)

Chapter
4
1503-UM054C-EN-P – June 2013
Description of Features
The IntelliVAC Plus incorporates a TDUV feature, which will keep
the contactor closed during an input voltage dip or brief power loss.
The TDUV time begins, this might be called as ‘low voltage’
protections – see Undervoltage with a CLOSE Command Preset on
Page 4-30, once the input line voltage goes <95Vrms just before a
Close command is issued or when the input line voltage goes
<80Vrms when the Hold cycle is in progress. This feature is
implemented in one of two manners:
• TDUV Using Internal Capacitor
• TDUV Using External Capacitor
The Basic module has been designed to provide a TDUV based on
its internal storage capacitance. The amount of time that it can
provide on its own is shown in Table 4.A.
Table 4.A – TDUV without External Capacitor
Control Voltage
Max. TDUV Time (seconds)
400A 800A
110/120V 0.2 0.2
220/240V 1.0 1.0
These maximum times are inherent in the design of the Basic module
and are programmable up to the maximums in Table 4.A. They are
only valid when the TDUV feature is enabled.
This means of providing TDUV will require a capacitor to be used,
which, due to its size, will be mounted outside the IntelliVAC Plus
module. The maximum ride-through time is shown in Table 4.B
Table 4.B – TDUV with External Capacitor
Control Voltage
Max. TDUV Time (seconds)
400A 800A
110/120V 2.0 2.0
220/240V 2.0 2.0
Time Delayed Under-Voltage
Ridethrough (TDUV)
TDUV Using Internal
Capacitor
TDUV Using External
Capacitor