INSTRUCTION
INSTRUCTION
ERP
Tel: +46 31-336 86 00
Fax: +46 31-26 28 60
[email protected]
www.frico.se
Frico AB
Box 102
SE-433 22 Partille
Sweden
NOV 98
Assembly
Remove the front. The locking screw is be-hind the set-point knob.
Mount ERP vertically with the cooling flange at the top. Use screws
with a maximum head diameter of 5.5mm.
If ERP is to be used with the internal sensor, mount it approx. 5ft
above floor level at a location with a representative temperature.
The air must be able to circulate freely around the ERP without
disturbances from doors, furniture etc.
If ERP is to be used with external sensor it may be placed in any
location.
N.B.
ERP emits approx. 20W of heat which must be dissipated.
N.B.
Maximum ambient temperature at full load is 30°C.
Protection class: IP20.
Setpoint range limiting
The setpoint range can be mechanically limited using the limiting
rings behind the setpoint knob.
Set the knob to a temperature within the desired limiting range.
Pull off the knob.
Loosen the screw locking the two rings. Rotate the blue ring so
that the protruding part is slightly lower than the lower temperature
limit. Use the markers on the bottom of the covers knob-cutout as
an aid. The markers are 5° apart.
In the same way set the red ring to a value slightly higher than the
upper limit temperature. Retighten the locking screw without
disturbing the position of the rings.
Replace the knob and check the result. Make fine adjustments if
necessary.
G
G
G
G
K
1 2 U
3 4 U
K G G
ERPGG
ERPRG
K
K
° C
Fig 1: Wiring of supply voltage and
heater.
Fig 2: Switch setting for internal
sensor.
Fig 3: Switch setting and wiring for
and external sensor.
Fig 4: Wiring of night set-back
function.
!
IMPORTANT: Read these instructions before installation and wiring of
the product. Save this instruction in a safe place for future use.
Triac controller for proportional control
of electric heating
ERP is a complete proportional controller for electric heating. It has
automatic voltage adjustment and can be used with either built-in
sensor or external sensor. ERP pulses the whole load On - Off. The
ratio between On-time and Off-time is varied 0 - 100% to suit the
prevailing heat demand. The current is always switched at zero phase
angle to prevent RFI.
ERP is only intended for electric heating control. The control principle
makes it unsuitable for motor- or lighting control.
N.B.
ERP cannot control 3-phase loads, as one phase is regulated.
Control principle
ERP pulses the full load On - Off. ERP adjusts the mean power
output to the prevailing power demand by proportionally adjusting
the ratio between On-time and Off-time. The pulse period (=the sum
of On-time and Off-time) is fixed 60 seconds.
ERP has zero phase-angle firing to eliminate RFI.
ERP automatically adjusts its control mode to suit the control object
dynamics.
For rapid temperature changes i. e. supply air control ERP will act
as a PI controller with a proportional band of 20K and a reset time
of 6 minutes.
For slow temperature changes i. e. room control ERP will act as a P
controller with a proportional band of 1.5K.
Electrical installation
The installation, which should be proceeded by a fully isolating
switch with a contact gap of at least 3 mm, should be carried out
by a qualified technician and in accordance with applicable
directives.
Supply voltage (fig 1)
Terminals 1 and 2. Not polarity sensitive.
Supply voltage: 200 - 415V AC, 50 - 60 Hz with automatic voltage
adjustment.
Maximum current 16A.
Load (fig 1)
Terminals 3 and 4.
Resistive single- or two-phase heater
Maximum load: 3680W at 230V (16A)
6400W at 400V (16A)
Minimum load:
230W at 230V (1A)
400W at 400V (1A)
N.B.
The cooling flange is live.
External sensor (figs 2 - 3)
Terminals G and G. Not polarity sensitive.
N.B.
When using external sensor the equivalent function in the
ERP must be disabled. This is done by setting the DIP-
switches to the right of the terminal strip according to the
figure 3.
N.B.
The ERP sensors have high potential compared to neutral
and earth (>200V). Thus, wiring and installation of the
sensors must comply with local codes for line voltage
installations.
Night set-back (fig 4)
Terminal K and K.
Potential-free closure will give a night set-back of 0 - 10K. Settable
with a potentiometer in the ERP.
