LR SPG501 006 User manual

SPG 501 CO2 FANCONTROL
SPG501_006
SPG501_008
OPERATION MANUAL English
Pressure control unit for refrigeration systems
with electronic pressure monitoring and digital display

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English
Contents
1. Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Safety notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Pressure measurement ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6. Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7. Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
8. Status LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
10. Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
11. Switching behaviour – HPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
12. Switching behaviour – LPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
13. Switching behaviour – HPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
14. Fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
15. RS-485 (Modbus RTU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
16. Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
17. Wall mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Page
1. Intended use
With the Sm artPre SS ure Gate CO2Fan COn trOl, the high and low pressures in refrigeration systems can be monitored
and, with the aid of switching outputs, be regulated and output as alarms.
Via the RS485 interface, the SPG 501 can be read out and configured by means of Modbus RTU.
Compatible with the refrigerant R744 (CO2). Any other use is considered a non-intended use.

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English
2. Safety notes
Please read these operating instructions carefully.
To ensure safe and reliable work,
only use the device for the described application.
The device may only be installed and commissioned by refrigeration techni-
cians from certified companies with electrotechnical training in the field of low
voltage. The device may only be operated by certified refrigeration technicians
from certified companies.
DANGER
Electrical shock can result in burns and life-threatening injuries.
The device must not be opened.
In the event of a defect, return the device to the manufacturer.
DANGER
Electrical shock can result in burns and life-threatening injuries.
Before beginning installation and maintenance work, switch off mains voltage.
CAUTION
When using refrigerants that are not listed in chapter "Specifications", injuries
may occur due to higher pressures or leaks.
DANGER
Fires may occur when using combustible refrigerants.
It is therefore forbidden to operate the device with combustible refrigerants.
WARNING
This device is not a safety-related installation. It may only be used in the
commercial sector. The system must absolutely be equipped with an approved
safety valve. If not observed, there is a danger of injuries and environmental
damage caused by the discharge of refrigerants in the event that the system
limits are exceeded.
WARNING
The discharge of refrigerants that are under pressure may cause eye injuries.
Wear protective goggles during installation and maintenance work.

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3. Specifications
- Supply voltage: 100…240 VAC @ 47…63 Hz, 140…340 VDC
- Current consumption: 200 mA max.
- Display: 3-digit LED display for LP (low pressure)
3-digit LED display for HP (high pressure)
- Relay switching current: 5A @ 250 VAC, not fuse-protected.
The specified switching currents must NOT be exceeded and adequate
external fuse protection must additionally be provided!
- Cable specification: 1.4 A @ 20° C
- LP analogue output: 4…20 mA / 0…10 VDC @ 0…60 bar
- HP analogue output: 4…20 mA / 0…10 VDC @ 0…160 bar OR FanCOn trOl (see chap. 14)
- Operating temperature: -25°…+55° C RH 60 %
- Protection class: IP 65 in accordance with DIN EN 60529 / IEC 60529
- Pressure connections: G1/4" - DIN 3852
- Refrigerants: R744 (CO2)
- Storage conditions: Store the device in a clean and dry environment.
Keep the device in a place inaccessible to unauthorised persons.
4. Pressure measurement ranges
Low Pressure (LP) relative High Pressure (HP) relative
Pressure range 0…60 bar 0…160 bar
Precision ±1.0 % full scale
Overload warning 2 % overload ("OFL" flashes + acoustic warning)
Overload 5 % overload ("OFL" indicator + acoustic warning)
Physical overload 120 bar 320 bar
Bursting pressure 300 bar 800 bar
English

S1 P2P1
A1 A2
S2 S3
D1 D2
D3
D4
D5
D6
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5. Overview
S1 Button 1 D3 HPS LED
S2 Button 2 D4 HPC LED
S3 Button 3 D5 LPS LED
A1 LP display (low pressure) D6 HOL LED
A2 HP display (high pressure) P1 LP sensor connection
D1 bar/°C LED P2 HP sensor connection
D2 °F LED
English

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English
6. Designations
HP (High Pressure): High pressure downstream of the compressor.
LP (Low Pressure): Low pressure upstream of the compressor (suction-side).
HPS (High Pressure Switch): Adjustable HP value to switch off the compressor and to issue an
alarm signal.
Hdt (High Pressure Delay Timer): Adjustable delay for the HPS in order to avoid unstable system
behaviour.
HPd (HP Switch Differential Pressure): Adjustable differential pressure relative to the HP value in order to
switch on the compressor again.
HPC (High Pressure Control): Adjustable HP value for controlling a fan at the condenser.
HIF (HP Differential Pressure): Adjustable differential pressure relative to HPC in order to switch off
the fan at the condenser.
LPS (Low Pressure Switch): For controlling the pressure at the suction side of the compressor, in
combination with automatic resetting.
LIF (LP Differential Pressure): Adjustable differential pressure in combination with condenser and
fan motor control.
Ldt (LP Delay Timer): Adjustable delay for deactivation of the LPS in order to avoid
unstable system behaviour.
FAN (Fan control): Switch fan control on or off via an analogue output.
FHP (Fan High Pressure): HP pressure at which the maximum analogue value is output (active
with "FAN ON")
FLP (Fan Low Pressure): HP pressure at which the minimum analogue value is output (active
with "FAN ON")
FLL (Fan Low Level): Minimum analogue value for the range at the output in %
HHA (Manual Mode & Automatic Mode): Resetting of the HPS when HP = HPS - HPd.
A: HPS is reset again automatically.
H: HPS is not reset until acknowledgement is given with button 3.
LHA (Manual Mode & Automatic Mode): Resetting of the LPS when LP = LPS - LIF
A: LPS is reset again automatically.
H: LPS is not reset until acknowledgement is given with button 3.
GAS: For setting the used refrigerant.
Unt: For setting the displayed pressure unit.
C-F: For setting the displayed temperature unit.
ADD: Setting of the device address at the RS485 communication connec-
tion for use at the Modbus RTU.
RES: Resetting of all adjustable parameters to their default values.

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English
7. Connection diagram
L1 (black)
N (brown)
LPS-A (red)
LPS-B (orange)
LPS-C (yellow)
HPS-A (green)
HPS-B (blue)
HPS-C (violet)
HPC-A (grey)
HPC-B (white)
LP output (white/yellow)
GND (white/red)
HP output (white/green)
GND (white/orange)
RS-485 A/- (white/brown)
RS-485 B/+ (white/black)
8. Status LEDs
HPS: Switching state of high pressure switch.
LPS: Switching state of low pressure switch.
HPC: Switching state of high pressure control.
HOL: off Automatic mode active
on Manual mode active
flashing Setting mode active
bar/°C:
- Pressure indicator mode: on Pressure display in bar
- Temperature indicator mode: on Temperature display in °C
°F:
- Temperature indicator mode: on Temperature display in °F
LPS
Low pressure switch
+ alarm output
HPS
High pressure switch
+ alarm output
HPC
Ventilator
4…20 mA / 0…10 VDC
4…20 mA / 0…10 VDC
RS-485 / Modbus-RTU

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9. Operation
Pressure indicator mode:
In this mode, the LP and HP pressures are displayed in the set unit.
Temperature indicator mode:
The button is used to switch between pressure display mode and temperature display mode. The display switches
to temperature display mode automatically after 20 seconds.
Setting mode:
Activate setting mode by pressing and holding down the button. The and buttons are used to change the pa-
rameters in the menu. The parameters can be changed in single steps by briefly pressing the buttons, or can be scrolled
through quickly by pressing and holding down the buttons.
Navigate through the menu by briefly pressing the button:
PAS
or in single steps to move to the next item
Hold down the button to confirm the password or to skip to the next item
Password is checked; if correct, the following parameters can be changed
HPS
or 0…160 bar in steps of 1
Hdt
or 0…200 s in single steps
HPd
or 0…160 bar in steps of 1
HPC
or 0…160 bar in steps of 1
HIF
or 0…160 bar in steps of 1
FAN
or ON/OFF
FHP
or 0…160 bar in steps of 1
FLP
or 0…160 bar in steps of 1
FLL
or 0…100 % in single steps
LPS
or 0…60.0 bar in steps of 1
LIF
or 0.0…60.0 bar in steps of 0.1
Ldt
or 0…200 s in single steps
HHA
or
LHA
or
English

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GAS
or
UNT
or
C-F
or
ADD
or 0…255 in single steps
RES
hold down or Resets all adjustable parameters to their default values
END
or End setting mode, change to the pressure display
Setting mode starts again at HPS
Setting mode is ended automatically and the pressure display is shown again if 20 seconds pass without a button being
pressed. Pressing and holding down the button ends setting mode and the pressure display is shown again.
10. Parameters
Label Name Limit values Default values
HPS High Pressure Switch 0…160 bar 30 bar
Hdt Delay timer for HPS value 0…200 s 0 s
HPd Differential pressure value for HPS value 0…160 bar 15 bar
HPC Ventilator Pressure Control 0…160 bar 20 bar
HIF Differential pressure value for HPC data 0…160 bar 5 bar
FAN Fan control ON/OFF OFF
FHP Fan High Pressure (HP) 0…160 bar 20 bar
FLP Fan Low Pressure (LP) 0…160 bar 5 bar
FLL Fan Low Level 0…100 % 15 %
LPS Low Pressure Switch 0.0…60.0 bar 7.0 bar
LIF Differential pressure value for LPS data 0.0…60.0 bar 2.0 bar
Ldt Delay timer for LPS value 0…200 s 0 s
HHA Selection of automatic or manual mode A: automatic / H: manual A
LHA Selection of automatic or manual mode A: automatic / H: manual A
C-F Selection of temperature unit °C, °F °C
Add RS-485 address for communication 0…255 2
RES Resetting of all parameters
to default values
--- ---
End Press arrow button to end --- ---
English

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11. Switching behaviour – HPC
HPC with the following set parameters:
HPC: 20 bar
HIF: 5 bar
12. Switching behaviour – LPS
LPS with the following set parameters:
LPS: 10 bar
Ldt: 3 seconds
LIF: 2 bar
English