62
Heading
AA
IQT Battery Failsafe
10
10.1 Introduction.
The IQT battery failsafe actuator
provides electrical operation after loss
of main AC electrical supply, allowing
the valve to be controlled
to a process,
mains fail safe position
. On loss of AC
supply, power is provided from integral
batteries located in a extended version
of the terminal cover. With AC power
applied to the actuator, the batteries
are charged from the actuator.
There are three possible failsafe actions
that can be customer configured:
Failsafe Close -
Close valve on loss of AC supply
Failsafe Open -
Open valve on loss of AC supply
Stayput waiting for command - The
actuator can then be directed to operate
via local or standard remote control
signals* within 30 minutes of AC power
being removed.
*Remote signals must be applied to
standard remote control inputs, close on
terminal 33, open on terminal 35 or ESD
on terminal 3 of battery pack connector.
On loss of AC supply remote control via
Folomatic proportional control or serial
digital network signals are not available.
*On loss of AC supply the IQT battery
failsafe does not support customer
nominal 24V DC supply on terminals
4 (-ve) and 5 (+ve) and therefore
control signal supply must be externally
powered. Refer to wiring diagram.
On loss of AC supply the IQT battery
failsafe does not support analogue
current position transmitter (CPT)
position feedback or serial network
communication. The IQT monitor relay
will de-energise on loss of AC supply.
WARNING:
CONTAINS BATTERIES
FIRE, EXPLOSION AND SEVERE
BURN HAZARD. DO NOT SHORT
CIRCUIT. DO NOT INCINERATE.
DO NOT DISASSEMBLE BATTERY
PACK. RECHARGE ONLY AS
PART OF THE IQT. DO NOT
EXPOSE BATTERIES TO AMBIENT
TEMPERATURES ABOVE 60°C
THE IQT BATTERY FAILSAFE
ACTUATOR CONTAINS HIGH
CAPACITY BATTERIES WHICH
ARE CONNECTED TO ACTUATOR
TERMINALS 14 (+) AND 21
(–). DC BATTERY POWER MAY BE
SUPPLIED TO THESE TERMINALS
WHEN THE AC ELECTRICAL
SUPPLY IS SWITCHED ON AND
SWITCHED OFF.
For safety the IQT Failsafe battery
pack is shipped with DC power fuses
FS3 and FS4 removed. It is essential
that the fuses are removed before
any maintenance work is carried
out on the actuator or the battery
assembly.
Before fitting Fuses FS3 and FS4 the
IQT actuator must be commissioned
in accordance with section 7, page
11 of this manual.
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