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9 . 1 C u r r e n t s e n s i n g r e l a y
The granulator can be equipped with an optional current sensing relay to control the feed
equipment.
The current sensing relay detects the granulator motor current consumption and can tem-
porarily stop accessories such as conveyors, roller feeders etc to avoid putting further
material into the hopper, when the granulator is running under heavy loading.
The relay stops and re-starts accessory equipment automatically, without re-setting.
Relay functions and normal settings:
T1 – Reaction time, time delay which prevents the relay from
opening during an intermittent high loading (0.1 - 3 sec.).
Default reaction time is 3.0 seconds.
T2 – Time delay on starting, which prevents the relay from
opening when the granulator is started (0.1 - 10 sec.).
The default start delay is 0.1 seconds.
A – Limit value, adjustable between 0 - 100 %.
Default setting depends on the current transformer size.
Check the current transformer size and then check the
default setting for this granulator.
B – Hysteresis, adjustable between 5 - 50% of the set limit.
Default hysteresis is 20 %.
C – Yellow LED, relay status indication.
• Lit when everything is OK, i.e. when the current is
below the limit value.
• Goes out if there is an alarm.
D – Green LED, indication for control current OK.
Connection
The current sensing relay is connected in series with
the granulator motor via a current transformer.
The transformer is connected between M and E1/E2/E3
depending on the secondary current.
(For transformers with transformation to 1 A, this is
connected to E1.)
Set function choice –
with or without memory.
–
with under-current or excess current.
Setting
The limit value is set with “A” for the upper % setting.
The current value at which you want the relay to open.
Note that the percentage knob depends on current trans-
former size and the measurement input used, E1, E2 or E3.
A
C
T1
T2
D
B
Function choice
with or without memory
With memory
Without memory
Under-current
Excess current
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W i r i n g D i a g r a m l
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