Page 1
POWER MONITORING
the user will be required to correct the interference at his own expense.
TM
H8238
Multi-Circuit Meter
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Follow safe electrical work practices. See NFPA 70E in the USA, or applicable local codes.
• This equipment must only be installed and serviced by qualified electrical personnel.
• Read, understand and follow the instructions before installing this product.
• Turn off all power supplying equipment before working on or inside the equipment.
• Use a properly rated voltage sensing device to confirm power is off.
DO NOT DEPEND ON THIS PRODUCT FOR VOLTAGE INDICATION
• SECONDARY LEADS/TERMINALS OF CURRENT OUTPUT (e.g. 5A) CTs MUST BE SHORTED,
OR CONNECTED TO THE BURDEN AT ALL TIMES.
• Only install this product on insulated conductors.
Failure to follow these instructions will result in death or serious injury.
A qualied person is one who has skills and knowledge related to the construction and
operation of this electrical equipment and the installation, and has received safety
training to recognize and avoid the hazards involved. NEC2009 Article 100
No responsibility is assumed by Veris Industries for any consequences arising out of the
use of this material.
NOTICE
INSTALLATION GUIDE
SPECIFICATIONS
Electrical Services Eight 3Ø circuits sharing a common line voltage source
Sample Rate 1280 Hz
Operating Temperature Range 0° to 60°C (32° to 140°F) (<95% RH, non-condensing)
Storage Temperature Range -40°C to 70°C (-40° to 158°F)
Altitude of Operation 3 km
Systems Accuracy +/- 1% (target, exclusive of user-sup plied CTs)*
Variable Update Rate 200 msec for voltages, 1.6 sec for all others
Measured Voltage Inputs:
Number
of Channels Three (phase A, B, C, plus neutral). Average of phases us ed
for L-N values if no neutral present
Maximum Voltage 277VAC L-N +10%; 480VAC L-L +10%
Frequency 50/60 H z
Terminal
torque 5.7 in•b (0.64 N•m)
Measured Current Inputs:
Number
CT Input Type 5 Amp (customer-supplied)
CT Range Each of 8 meter s independently adjustable from 1A:5A to 9999A:5A
Terminal Block 6-position Euro st yle cage clamp connecto r (max. wire size 14 gauge);
torque 4.4 in•lb (0.50 N•m)
Operating Power Inputs:
Power
Power Voltage Tolerance +10/-25%
Frequency 50/60 Hz
Terminal Block 2-position Euro style pluggable connec tor (max. wire size 12 gauge)
Network Connections:
Baud
Parity DIP switch-selectable NONE, ODD, EVEN
Communication
Terminal Block 5-position Eur o style pluggable conne ctor (max. wire size 12 gauge);
nominal torque 4.0 in•l b (0.45 N•m); maximum torque 5.0 in•lb (0.56 N•m)
Installation
Block 4-position Euro style pluggable connector (max. wire size 12 gauge);
of Channels 24 (8 meters x 3 phases/meter)
Source Dedicated 120VAC L-N (H8238) or 240VAC L-N (H8238E); fused 40 mA
Type Modbus RTU
Connection DIP switch-select able 2-wire or 4-wire
Address DIP switch-select able base address (1 to 233 in steps of 8)
Rate DIP switch-select able 2400, 4800, 9600, 19200**
Format 8-data-bits, 1-star t-bit, 1-stop-bit
Categor y Cat III, pollution degree 2
• This product is not intended for life or safety applications.
• Do not install this product in hazardous or classified locations.
• The installer is responsible for conformance to all applicable codes.
• Mount this product inside a suitable fire and electrical enclosure.
FCC PART 15 INFORMATION
NOTE: This equipment has been tested by the manufacturer and found
to comply with the limits for a class A digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and
used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in
a residential area is likely to cause harmful interference in which case
Modifications to this product without the express authorization of
Veris Industries nullify this statement.
* Accuracy specication valid only whe n amperages are greater than 10% of maximum CT range.
** Baud rates for H8238EL are 1200, 2400, 4800, and 9600.
QUICK INSTALL
Observe precautions for handling static sensitive
devices to avoid damage to the circuitry that
is not covered under the factory warranty.
1. Connect the current inputs.
2. Connect the voltage leads.
3. Congure the communication switches.
4. Select a network address.
5. Connect the RS-485 connection to the communications wiring.
PRODUCT IDENTIFICATION
6. Connect the circuit power.
MODEL DESCRIPTION
H8238 Multi-Circuit Monitor, 90-130 VAC supply voltage
H8238E Multi-Circuit Monitor, 240 VAC supply voltage
H8238EL Multi-Circuit Monitor, 240 VAC supply voltage, low baud rate version
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H8238
1
2
3
3
4
5
6
7
8
9
101
11
12
13
14
TM
INSTALLATION GUIDE
PRODUCT OVERVIEW
The H8238 multi-circuit meter provides a means of monitoring multiple loads
originating from the same electrical service. The multi-circuit meter can monitor
up to eight 3-phase, 3-wire loads or six 3-phase, 4-wire loads with neutral current
monitoring. With one RS-485 connection, the H8238 provides a Modbus RTU
communications output and 72 alarms for situations such as over/under voltage,
over/under current, and phase loss. Up to 30 devices can be addressed on the same
Modbus network.
DIMENSIONS
Top View
Side View
main circuit board
mounting bracket
3
A B
C
D
F
E
PRODUCT DIAGRAM
1. Board Connection Ribbon Cable: Connects the transducer and CT circuit
boards.
2. Configuration Table: Easy reference communications conguration chart, silk-
screened on the circuit board.
3. ALIVE LED: Flashes once per second to indicate correct operation. If steadily lit,
indicates internal communications diagnostic event.
4. Sensed Voltage Connection: Sensed line voltage, common for all meter
channels. 0-480 VAC.
5. Baud Rate & Parity Selection Switches: Field selectable parity, baud rate, and
2 or 4 wire communications parameters.
WIDTH:
A 5.3”/135mm (board)
B 8.9”/226mm (mounting bracket base)
LENGTH:
C 6.0”/153mm
D 12.8”/325mm
6. Modbus Address DIP Switches: Set these switches must be set to assign an
individual Modbus address before connecting the device (see page 7) .
7. TX LED: Indicates successful transmission of information over the Modbus
network.
8. Optical Isolation: An optical isolation barrier separates high voltage from the
HEIGHT:
E 2.9”/74mm
F 4.0”/101mm
communications network.
9. RS-485 2 or 4-wire Connection: Daisy chain multiple H8238s using a 2 or
4-wire Modbus network.
10. RX LED: Indicates successful reception of information over the Modbus network.
11. Power Transformers: Linear power supply for reliability and low noise.
12. 250 VAC 40mA Slow Blow Fuse: Fused power connection for circuit protection.
13. 120 or 240 VAC Power Connection*: Easy 2-wire 120 or 240 VAC line to neutral
50/60 Hz.
14. 5A CT Input Terminals: Current Transformer (CT) terminals accept any 5 A CT
signal. Two wire, not polarity sensitive.
* For 240 VAC power connection version, use the H8238E or H8238EL.
DANGER: 5A CTs can present hazardous voltages.
Install CTs in accordance with manufacturer's instructions.
Terminate the CT secondary before applying current.
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H8238
*
A
B
C
N
JP1 JP2
METER 1
JP3
A B C
TM
INSTALLATION GUIDE
INSTALLATION
Disconnect and lock out power to the device.
Current Configuration
DANGER: 5A CTs can present hazardous voltages.
Install CTs in accordance with manufacturer's instructions.
Terminate the CT secondary before applying current.
1. Connect the current inputs. The multi-circuit meter is capable of monitoring up to
eight 3Ø 3-wire circuits or six 3Ø circuits plus neutral current. Choose either 8 or 6
meter conguration and proceed to either step 2 or 3, as appropriate.
2. Eight 3Ø 3-Wire Circuit Monitoring Mode: Connect 5 Amp CTs to terminal blocks
JP1 through JP24. The JP terminal blocks are two position, not polarity sensitive,
and compatible with standard 2-wire 5 Amp CT outputs. Connect each monitored
service to the JP terminals within a meter set. For example meter #1 CT inputs are
labeled JP1 (PhA), JP2(PhB), & JP3(PhC). Connect the CT monitoring phase A for
metered service to the rst JP in its set.
3. Six 3Ø 4-Wire Circuit Monitoring Mode: Connect 5 Amp CTs to terminal blocks
JP1 through JP24. The JP terminal blocks are two position, not polarity sensitive,
and compatible with standard 2-wire 5 Amp CT outputs. Connect each monitored
service to the JP terminals within a meter set. For example meter #1 CT inputs are
labeled JP1 (PhA), JP2 (PhB), & JP3 (PhC). Connect the CT monitoring phase A for
metered service to the rst JP in its set. The terminal blocks referenced by meter 7
and meter 8 are used to monitor neutral currents. Wire the CT monitoring neutral
current for the service monitored by METER 1 to JP19. Wire the CT monitoring
neutral current for the service monitored by METER 2 to JP20. Wire the CT
monitoring neutral current for the service monitored by METER 3 to JP21 and so
on through JP24.
4. Connect the voltage leads to the phase conductors as shown in the wiring
examples on this page. The monitored voltage must be common to all services
monitored by the CTs installed previously.
A
B
C
HOT
HOT
3-Phase 3-Wire Installation
1-Phase 3-Wire Installation
N
†
*
Neutral current
monitoring optional
3-Phase 4-Wire Installation
1-Phase 2-Wire Installation†
120V
HOT
Neutral current
monitoring optional
N
† Phase loss, Under Current & Under Voltage alarms are ac tive when
monitoring single phase lo ads.
*
Neutral current
monitoring optional
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H8238
BAUD
PARITY
6/8 METERS
2/4 WIRE
SW2 1 2 3 4 5 6
6 METERS OFF
8 METERS ON
2-WIRE OFF
4-WIRE ON
2400 BAUD OFF OFF
4800 BAUD ON OFF
9600 BAUD OFF ON
19200 BAUD ON ON
EVEN PARITY OFF
ODD PARITY ON
DISABLE PARITY OFF
ENABLE PARITY ON
LSB
MSB
ADDRESS
11
2
3
4
5
6
7
8
1
2
3
4
5
6
†
†
Meter #1
Meter #2
Meter #3
Meter #4
Meter #5
Meter #6
Meter #7
Meter #8
Meter #1
Meter #2
Meter #3
Meter #4
Meter #5
Meter #6
Meter #7
Meter #8
Base Address 8 METER MODBUS
ADDRESS
6 METER MODBUS
ADDRESS
BASE 1
Switch
Value = 0
99
10
11
12
13
14
15
16
9
10
11
12
13
14
†
†
Meter #1
Meter #2
Meter #3
Meter #4
Meter #5
Meter #6
Meter #7
Meter #8
Meter #1
Meter #2
Meter #3
Meter #4
Meter #5
Meter #6
Meter #7
Meter #8
Base Address 8 METER MODBUS
ADDRESS
6 METER MODBUS
ADDRESS
BASE 9
Switch
Value = 1
TM
INSTALLATION GUIDE
Communications Configuration
5. Before wiring the H8238, congure the DIP switches:
6 or 8 Meters
Congure the H8238 to monitor either 6 services and their neutral curents or
8 services without monitoring neutral currents.
2 or 4 Wire
Congure the H8238 to supply a 4-wire or a 2-wire RS-485 Modbus output.
Baud Rate
Congure the Modbus output of the H8238 to communicate at one of four
dierent baud rates: 2400, 4800, 9600, or 19200 (for the H8238EL, possible
baud rates are 1200, 2400, 4800, or 9600).
Parity
Congure the Modbus output of the H8238 to Even Parity, Odd Parity, or no
Parity (Disable).
The values of each DIP switch are as follows:
Switch Number Switch Value
1
2
3
4
5
6
1
2
4
8
16
32
To determine an address, add the values of any address that is on.
ON
Switch Value of 6
OFF
=
Base Address of 49
LSB MSB
Switch number 2 has an ON value of 2 and switch number 3 has an ON value of 4. The
total switch value is 6 (2+4=6). The base address for a switch address of 6 is 49.
6. Set the network address of the device in increments of 8 starting with the base
address of 1. The switch value and the base address are not the same. If a switch
value of zero is chosen (all switches in the o position), then the base address is
1. The 8 meters of that H8238 are automatically assigned addresses of 1 through
8 on the Modbus network. No other device on the network may occupy any of
the addresses occupied by an H8238. See right for the rst three possible switch
values, base addresses, and meter addresses. See the Address Selection section of
this guide for all possible switch values and base addresses.
Switch
Value = 2
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BASE 17
† Reserved for use when 8 meters a re connected. Connec tion of 8 meters is only possible when
neutral current monitoring is not required.
Base Address 8 METER MODBUS
17 17
Meter #1
Meter #2
Meter #3
Meter #4
Meter #5
Meter #6
Meter #7
Meter #8
ADDRESS
18
19
20
21
22
23
24
6 METER MODBUS
Meter #1
Meter #2
Meter #3
Meter #4
Meter #5
Meter #6
Meter #7
Meter #8
ADDRESS
17
18
19
20
21
22
†
†
Page 5
H8238
BASE
ADDRESS
BASE
ADDRESS
BASE
ADDRESS
17
91
25
33 41
49
57
65
73 81
SWITCH
VALUE
2
10
3
45
6
7
8
910
89
97 105 113 121
129
137
145 153
161 169
SWITCH
VALUE
11
12 13 14 15
16
17
18 19
20 21
177
185
193
201
209
217
225
233
SWITCH
VALUE
22
23
24
25
26
27
28
29
TM
Address Selection
Assign a unique Modbus address to each device. Set the switch block to assign a
unique address before the connecting the device to the Modbus RS-485 line. If
two devices are assigned the same address, then neither device will be able to
communicate. Below are all possible switch values.
INSTALLATION GUIDE
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Page 6
H8238
TM
7. Connect communications wiring. Follow diagrams below. Wire the RS-485
connection consistent with the 2/4 wire congurations made in step 4.
INSTALLATION GUIDE
Power Wiring
120 VAC*
Master (H8936) Slave (H8238)
4-Wire RS485
Master or Slave
TX–
SHIELD
TX+
RX–
RX+
2-Wire RS485
SHLD
TERMINATING THE H8238
If the H8238 is the last device on the network, terminate it to ensure reliable
communications.
TX–
TX+
SHLD
RX–
SHIELD
TX+
TX–
SHIELD
TX+
TX–
RX+
TX–
TX+
SHLD
RX–
SHIELD
TX+
TX–
RX+
*For 240VAC power connection version, order catalog number H8238E
TX-
RX-
TX+
RX+
Shield TX- TX+
1. Insert the wires of the daisy chain and the wires of the terminator into the holes of
the RS-485 communications connector.
2. Using a small at blade screwdriver, tighten the connector’s screws. Torque the
connector screws 4 lbs-in. (0.45 N-m).
3. Reinstall the connector back into the signal acquisition board.
4. Secure the communications cable in the enclosure.
©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 11124
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Page 7
H8238
TM
INSTALLATION GUIDE
CONFIGURING CT VALUES AND SETTING ALARM THRESHOLDS
Congure CT values and alarm thresholds with the software conguration utility or by writing to Modbus protocol registers.
Parameter Description Register
Range Default Value
Number
CT Scale congure the H8238 to the size of the CTs monitoring the service. 30 1-5999 A 100 A
Over Voltage Alarm Threshold occurs if the average L-L voltage is greater than this threshold at any time 31 0-65535 V* 65535 V
Under Voltage Alarm Threshold occurs if the average L-L voltage is less than this threshold for at least 1- seconds 32 0-65535 V* 0 V
Over Current Alarm Threshold Register occurs if any phase current is greater than this threshold at any time 33 0-65535 A* 65535 A
Under Current Alarm Threshold occurs if any phase current is less than this threshold at any time 34 0-65535 A* 0 A
Over kVA Alarm Threshold Register occurs if the total apparent power is greater than this threshold at any time 35 0-65535 kVA* 65535 kVA
Under kVA Alarm Threshold occurs if the total apparent power is less than this threshold at any time 36 0-65535 kVA* 65535 kVA
Meter Alarm Status Register This register holds in memory any alarm that has occurred in the meter. Conditions that caused
an alarm and then returned to normal states are visible in this register. To clear the latching
alarms, write a 0 to the desired bit.
Bit 0 Over Current
Bit 1 Under Current
Bit 2 Over kVA
Bit 3 Under kVA
Bit 4 O ver Voltage
Bit 5 Under Voltage
Bit 6 Phase Loss A
Bit 7 Phase Loss B
Bit 8 Phase Loss C
37 n/a
Phase Loss Threshold Sets the maximum to deviation of any phase voltage compared the average L-N voltage 38 0-100% 65535 (disabled)
Meter Alarm Status This register holds the instantaneous state of the meter alarms. Alarms in this register represent
present conditions only.
49 n/a Non Latching
Modbus Function Codes Supported
3, read holding registers
6, preset single register
17, report slave ID
* Correct conversion to engineering u nits requires use of integer multiplier. For example: To set
over-voltage threshold (#31) to 235 V:
235V
0.1
2350 is the value to write to #31
= 2350
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