Owner's manual

3-18 Installation and Wiring
1503-UM051D-EN-P – June 2013
Time Delay Undervoltage The IntelliVAC can be configured to provide time delay undervoltage
(TDUV) protection. The feature is available to keep electrically held
contactors closed during a voltage dip or brief power loss. This
option may require the addition of a capacitor (see below). Refer to
Chapter 6 for typical capacitor sizing. The capacitor is connected to
terminals 1(-) and 2(+) of the IntelliVAC. (Refer to Figure 3.15.)
Table 4.B of the “Setup and Commissioning” chapter has the dip
switch settings to provide TDUV from 0.2 to 2 seconds. IntelliVAC
can provide TDUV protection without the use of an external
capacitor, as shown in Table 3.D.
Table 3.D – Maximum TDUV Time (without Capacitor)
Control Voltage Max. TDUV Time (secs)
110/120 V 0.2
220/240 V 1.0
The following conditions will initiate TDUV protection, regardless
of the supply voltage:
1. If the supply voltage drops below 90 VAC/VDC after the first
200 milliseconds after a contact close request.
2. When the supply voltage drops below 72 VAC/FDC after the
200 millisecond close sequence.
If the undervoltage condition persists beyond the set delay time, the
contactor will be opened and an undervoltage fault condition will occur.
∗ Refer to Table 3.A for recommended fuse sizing.
N'
N
EMC FILTER
G
P'
P
MOV
32
1
EC
-
+
4
TCO
12
11
AUX CCO
5
6
L1 L2/NG
+-
STOP
START
OVERLOAD
CONTROL
POWER
FUSE
*
CONTROL POWER
M-IV
910
CLOSE
M-IV
15 16
CONTACTOR
STATUS
M
M-IV
M
CAPACITOR
∗ Refer to Table 3.A for recommended fuse sizing.
N'
N
EMC FILTER
G
P'
P
MOV
32
1
EC
-
+
4
TCO
12
11
AUX CCO
5
6
L1 L2/NG
+-
STOP
START
OVERLOAD
CONTROL
POWER
FUSE
*
CONTROL POWER
M-IV
910
CLOSE
M-IV
15 16
CONTACTOR
STATUS
M
M-IV
M
CAPACITOR
Figure 3.15 – TDUV Control Circuit